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Detailed Description of VII/290 :
The Million Quasars (Milliquas) catalogue, version 7.2 (Flesch, 2021)

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Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.
VII/290    The Million Quasars (Milliquas) catalogue, version 7.2 (Flesch, 2021)
================================================================================
The Million Quasars (MILLIQUAS) catalogue, version 7.2.
   Flesch E.W.
   <Pub. Astron. Soc. Australia 32, 10 (2015)>
   =2015PASA...32...10F
   =2021yCat.7290....0F
================================================================================
ADC_Keywords: QSOs ; Active gal. nuclei ; Redshifts ; Magnitudes

Keywords: catalogs - quasars: general


Description:
    This is a compendium of 829666 type-I QSOs and AGN, largely complete
    from the literature to 30 April 2021 including SDSS-DR16 quasars and
    VLASS radio. Also included are 703348 candidates which are calculated
    as 60%-100% likely to be quasars, including 225051 which are
    radio/X-ray associated. Type-II and Bl Lac objects are also included,
    bringing the total count to 1573824. Gaia-DR2 astrometry is used
    where available, amounting to ~66% of all objects.

    Changes from version 7.1 are:
    (1) Quasars added from publications to 30 April 2021.
    (2) The VLASS Quick Look radio catalog is included, which adds 34189
        new radio core associations and 6793 probable double radio lobe
        associations.
    (3) Ongoing audits of SDSS & LAMOST quasars have led to a few
         additions & drops. Some WISEA-supported SDSS/LAMOST pipeline
         quasars are now accepted which were otherwise marginal. Also
         some likely galaxies removed.

    Low-confidence/quality or questionable objects (so deemed by their
    researchers) are not included in Milliquas. Additional quality cuts
    can apply as detailed in the HMQ paper (Flesch, 2015PASA...32...10F).
    Full QSO/AGN classification is via spectral lines, thus hidden /
    occluded objects may be absent from Milliquas. Two NIQs offset
    <2-arcsecs can be reported as a single object if within the same host.
    The aim here is to present one unique reliable object per each data
    row.

    The catalog format is simple, each object is shown as one line bearing
    the J2000 coordinates, its original name, object class, red and blue
    optical magnitudes, PSF class, redshift, the citations for the name
    and redshift, plus up to four radio/X-ray identifiers where
    applicable.

    Please cite as Milliquas v7.2, Flesch, E.W. 2021, arXiv:2105.12985 or
    as Milliquas v7.2 (2021) update, Flesch, E.W. 2015PASA...32...10F.

    Questions/comments/praise/complaints may be directed to me at
    eric(at)flesch.org.

File Summary:

FileName Lrecl Records Explanations
× 80 . This file × ReadMe 80 . This file × catalog.dat 192 1573824 The catalogue (v7.2), 30-April-2021 × refs.dat 162 2171 References (for numerical references)
See also: VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015) VII/277 : The Million Quasars (Milliquas) catalogue (V4.8) (Flesch, 2016) VII/280 : The Million Quasars (Milliquas) catalogue (V5.2) (Flesch, 2017) VII/283 : The Million Quasars (Milliquas) catalogue (V6.3) (Flesch, 2019) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 11 F11.7 deg RAdeg Right ascension J2000 (degrees) (1) 13- 23 F11.7 deg DEdeg Declination J2000 (degrees) (1) 26- 50 A25 --- Name ID from the literature, or J2000 (2) 52- 55 A4 --- Type Classification of object, and associations (3) 57- 61 F5.2 mag Rmag ?=0 Red optical magnitude (4) 63- 67 F5.2 mag Bmag ?=0 Blue optical magnitude (4) 69- 71 A3 --- Comment Comment on optical object (5) 73 A1 --- R Red Optical PSF class (6) 75 A1 --- B Blue Optical PSF class (6) 77- 82 F6.3 --- z ? Redshift from the literature or estimated (7) 84- 89 A6 --- rName Citation for name (8) 91- 96 A6 --- rz Citation for redshift (8) 98-100 I3 pct Qpct ? Probability that this object is a QSO (9) 102-123 A22 --- XName X-ray ID, if any (10) 125-146 A22 --- RName Radio ID, if any (10) 148-169 A22 --- Lobe1 Radio lobe ID or extra R/X ID, if any (10) 171-192 A22 --- Lobe2 Radio lobe ID or extra R/X ID, if any (10)
Note (1): These are to 7 decimals which suits Gaia-DR2 astrometry. Note (2): Nameless radio/X-ray associated objects here show the J2000 position in HHMMSS.SS+DDMMSS.S for the convenience of the user. If needing a name for it, just preface the J2000 with "MQ", e.g., MQ J000001.89+443053.8 . Note (3): Legend of type/class: Q = QSO, type-I broad-line core-dominated, 790776 of these. A = AGN, type-I Seyferts/host-dominated, 38890 of these. B = BL Lac object, 2704 of these. L = lensed quasar extra image, only 64 of these in this optical data. K = NLQSO, type-II narrow-line core-dominated, 5316 of these. N = NLAGN, type-II Seyferts/host-dominated, 32726 of these. Includes an unquantified residue of legacy NELGs/ELGs/LINERs. q = quasar candidate of the displayed QSO likelihood, 559424 of these. R = radio association displayed. X = X-ray association displayed. 2 = double radio lobes displayed (declared by data-driven algorithm). Note (4): Optical data is mostly from the ASP optical catalog (Flesch, 2017PASA...34...25F) which presents data from the APM (http://www.ast.cam.ac.uk/~mike/apmcat), USNO-A & USNO-B (http://www.nofs.navy.mil), and the SDSS (http://sdss.org). APM/USNO-A magnitudes were recalibrated as documented in 2004A&A...427..387F, so such USNO-A magnitudes are often used in preference to USNO-B. APM/USNO-B galaxies < mag 17 are usually shown too bright due to PSF modelling. Integer magnitudes (e.g., 22.00) are estimates if both bands are integer or one band empty. Note: many SDSS magnitudes are "extinction-corrected" ~0.3 mag brighter than observed. Note (5): Legend as follows: p = optical magnitudes are POSS-I O (violet 4050A) and E (red 6400A). These are preferred because O is well-offset from E, and those plates were always taken on the same night, thus the red-blue color is correct even for variable objects. Epoch is 1950's. j = optical magnitudes are SERC J (Bj 4850A) and R (red 6400A) from the POSS-II or UKST surveys. Red-blue color is less reliable because the red & blue plates were taken in different epochs, i.e., years apart. b = blue magnitude is Vega 4400A (Johnson), red is 6400A (Cousins). g = blue magnitude is SDSS-type green 4900A, red is r 6200A. u = blue magnitude is SDSS ultraviolet 3850A. v = red magnitude is visual., i.e., white, 5500A midpoint. i = red magnitude is infrared 7500A. z = red magnitude is infrared z 8600A. r = red magnitude is r 6200A. (blank) = Pan-STARRS r 6200A & g 4900A, but red alone is 6400A (Cousins). G = Gaia-DR2 astrometry shown, precessed to J2000 by CDS. If 'G' is alone then the magnitudes are Gaia RP & BP, or Gaia G if red band only. + = variability nominally detected in both red/blue over multi-epoch data. m = proper motion nominally detected, from USNO-B. % = swap of two "unplugged" SDSS spectra which crossed wires (7 of these). a = object is host-dominated with faint nuclear activity, such as an SDSS pipeline galaxy with an AGN subclass or AGN-classed elsewhere, see its citation. Milliquas class is 'A' if BROADLINE, else 'N'. (see note 2) Note (6): The APM, USNO-B, and SDSS provide PSF class, albeit using different criteria. These are shown here as: - = point source / stellar PSF (APM notation: -1, here truncated) 1 = fuzzy / galaxy shape (APM notation: 1 and some 2) n = no PSF available, whether borderline or too faint to tell, etc. x = not seen in this band (fainter than plate depth, or confused, etc.) Note (7): Spectroscopic/grism redshifts are required for objects classified as Q/A/K/N/L and is optional for B (BL Lac type). Photometric redshifts rounded to 0.1z can be displayed for B/R/X/2 objects, and are either taken from the cited catalogue or calculated here using the four-colour method of Flesch 2015PASA...32...10F, Appendix 2, using 4 colours from SDSS ugriz, Pan-STARRS grizy, or, for WISEA, the 4 colours B-R, R-W1, W1-W2, and W2-W3. Note (8): Legend (with counts of name and redshift) and references: (for numerical reference code, see refs.dat file): 2dF (357,211) : 2dF galaxy survey, Colless M. et al., 2001MNRAS.328.1039C, Cat. VII/250 2QZ (27520,24157) : Croom S.M. et al., 2004MNRAS.349.1397C, Cat. VII/241 2SLAQ (10353,8679) : Croom S.M. et al., 2009, Cat. J/MNRAS/392/19 3FGL (16,11) : Fermi cleanups, Paiano S. et al., 2017ApJ...851..135P 3FGL2 (21,19) : Fermi cleanups II, Paiano S. et al., 2019ApJ...871..162P 3HSP (819,999) : 3HSP blazars, Chang Y.-L. et al., 2019A&A...632A..77C, Cat. J/A+A/632/A77 3XLSS (25,25) : The XXL Survey, Pierre M. et al., 2016A&A...592A...1P, Cat, IX/49 4FGL1 (15,3) : Fermi cleanups, de Menezes R. et al., 2019A&A...630A..55D 4FGL2 (18,22) : Fermi cleanups X, de Menezes R. et al., 2020Ap&SS.365..12D 4LAC (367,349) : Fermi AGN v4 + LL, Fermi-LAT collab., 2020ApJ...892..105A 6dF (315,223) : 6dF galaxy survey, Jones D.H. et al., 2009MNRAS.399..683J, Cat. VII/259 AAOz (1491,1498) : AAOmega XXL-South: Lidman C. et al., 2016PASA...33....1L AGES (2046,2046) : AGES survey, Kochanek C.S. et al., 2012, Cat. J/ApJS/200/8 AGNELL (2,3) : DES lenses, Agnello A. et al., 2015MNRAS.454.1260A AGNELA (4,4) : SDSS J1433+6007 4-lens, Agnello A. et al., 2018MNRAS.474.3391A AGNEL2 (13,13) : VST-Gaia QSO pairs, Agnello A. et al., 2018MNRAS.475.2086A AKARI (1,1) : overlooked luminous quasar, Aoki K. et al., 2011PASJ...63S.457A ALMA (4,4) : ALMA hi-z, Roberto Decarli R. et al., 2018ApJ...854...97D ANDIKA (2,2) : Hi-z starbursts: Andika I.T. et al., 2020ApJ...903...34A ANGUIT (1,1) : COSMOS lens, Anguita T. et al., 2009A&A...507...35A ATel (5,5) : Astronomers Telegraph posts, http://www.astronomerstelegram.org ATHENS (86,108) : VIPERS AGN SEDs, Pouliasis E. et al., 2020MNRAS.495.1853P, Cat. J/MNRAS/495/1853 ATLAS (229,269) : Mao M.Y. et al., 2012, Cat. J/MNRAS/426/3334 BAHM (24,24) : dust-reddened QSOs, Banerji M. et al., 2015MNRAS.447.3368B BASS (16,113) : Swift-BAT AGN, Koss M. et al., 2017, Cat. J/ApJ/850/74 BERGHE (1,1) : Pan-STARRS lens, Berghea C.T. et al., 2017ApJ...844...90B BGGFC (4,4) : COSMOS hi-z, Boutsia K. et al., 2018ApJ...869...20B BLAZZ (0,8) : Blazar redshifts, Goldini P. et al., 2020,arXiv:2012.05176 BMCGCS (1,1) : Belladitta S. et al., 2019A&A...629A..68B BMCS (1,1) : Blazar at z>6, Belladitta S. et al., 2020A&A...635L...7B BQLS (16,16) : BOSS QSO lenses & pairs, More A. et al., 2016MNRAS.456.1595M BZCAT (4,3) : Blazars catalog, Massaro E. et al., http://www.asdc.asi.it/bzcat C-COSM (180,180) : Chandra COSMOS IDs, Marchesi S. et al., 2016ApJ...817...34M ChaMP (191,187) : Trichas M. et al., 2012ApJS..200...17T DABAST (1,1) : Diaz-Santos T. et al., 2018Sci...362.1034D Dart (26,25) : Heavily Obscured QSOs, Hviding R. et al., 2018MNRAS.474.1955H DDC2 (14,14) : variable AGN, De Cicco D. et al., 2019, Cat. J/A+A/627/A33 DEEP (143,139) : DEEP2, Newman J. et al., 2013ApJS..208....5N; deep.ps.uci.edu/DR4 DES (1,1) : Dark Energy hi-z, Reed S.L. et al., 2015MNRAS.454.3952R DESQQ (26,26) : STRIDES lenses, Anguita T. et al., 2018MNRAS.480.5017A DESQQ2 (12,12) : STRIDES lenses, Treu T. et al., 2018MNRAS.481.1041T DPeake (683,656) : Double-peaked NELGs, Ge J.-Q. et al., 2012, Cat. J/ApJS/201/31 DR12 (6,6) : Alam S. et al., 2015ApJS..219...12A, https://sdss.org/dr12 DR12Q (244,15) : SDSS-DR12Q, Paris I. et al., 2017A&A...597A..79P, Cat. VII/279 DR14 (12,44) : Abolfathi B. et al., 2018ApJS..235...42A, pipeline, data at https://data.sdss.org/sas/dr14/sdss/spectro/redux DR14Q (1527,1538) : SDSS-DR14Q, Paris I. et al., 2018A&A...613A..51P data at https://data.sdss.org/sas/dr14/eboss/qso/DR14Q DR16 (41065,374519) : Ahumada R. et al., 2020ApJS..249....3A, pipeline, data at https://data.sdss.org/sas/dr16/sdss/spectro/redux DR16Q (715827,395233) : SDSS-DR16Q, Lyke B. et al., 2020ApJS..250....8L 2 files, data at https://data.sdss.org/sas/dr16/eboss/qso/DR16Q DR16QN (0,2132) : same as above, using the QuasarNET redshift supplied. DR7 (2,26) : SDSS DR7, Abazajian K.N. et al., 2009ApJS..182..543A files at http://classic.sdss.org/dr7/products/spectra/getspectra.html DR7Q (1967,200) : SDSS Quasar DR7, Schneider D. et al., 2010AJ....139.2360S, Cat. VII/26 data http://classic.sdss.org/dr7/products/value_added/qsocat_dr7.html DUALQ (1,1) : Dual QSOs HSC, Silverman J.D. et al., 2020ApJ...899..154S DUHIZ (2,2) : DECaLS-UKIRT hi-z, Wang F. et al., 2017ApJ...839...27W Dusty (11,11) : Dusty Starbursts, Rodighiero G. et al., 2019ApJ...877...38H DUz6 (18,18) : DESI & UKIRT hi-z, Wang F. et al., 2019ApJ...884...30W eHAQ (82,80) : Extended High AV, Krogager J.-K., 2016ApJ...832...49K ELQ-PS (216,215) : ELQS on PS1, Schindler J.-T. et al., 2019, Cat. J/ApJS/243/5 ELQS-N (38,38) : ELQS in NGC, Schindler J.-T. et al., 2018ApJ...863..144S ELQS-S (126,126) : ELQS in SGC, Schindler J.-T. et al., 2019ApJ...871..258S FISCBA (1,1) : HST lens, Fischer/Schade/Barrientos, 1998ApJ...503L.127F FLES40 (40,0) : Salvaged QSOs, Flesch E.W., 2021MNRAS.504..621F FYNBO (1,1) : LiBAL QSO, Fynbo J.P.U. et al., 2020A&A...634A..11D GAIA1 (21,21) : Gaia DR1, Gaia Collaboration et al., 2016A&A...595A...1G, Cat. I/337 GAIA2 (236,232) : Gaia DR2, Gaia Collaboration et al., 2018A&A...616A...1G, Cat. I/345 (GAIA data as presented by SIMBAD, http://simbad.u-strasbg.fr/simbad) GEIER (1,1) : Geier S.J. et al., 2019A&A...625L...9G GGLS (3,4) : Gaia GraL, Krone-Martins A. et al., 2019, arXiv:1912.08977 GLDD (1,1) : Lensed QSO data-driven, Ostrovski F. et al., 2017MNRAS.465.4325O GLIKMA (28,28) : red WISE QSOs, Glikman E. et al., 2018, Cat. J/ApJ/861/37 GLOH (1,1) : Grav Lensed Objs HSC, Jaelani A.T. et al., 2020,arXiv:2006.16584 GLRED (1,1) : lensed red QSO, Glikman E. et al., 2018,arXiv:1807.05434 GQ (2,2) : serendipitous binary, Altamura E. et al., 2020AJ....159..122A GRAL4 (10,10) : Gaia Grav Lens quads, Stern D. et al., 2020,arXiv:2012.10051 GUTI (1,1) : not a ULX, Gutierrez C.M., 2013A&A...549A..81G GZPM (23,23) : Gaia zero pm, Heintz K.E. et al., 2020, Cat. J/A+A/644/A17 H-DOGs (16,16) : Herschel DOGs, Riguccini L.A. et al., 2019A&A...625A...9D HAQ (2,2) : High AV serendipitous, Heintz K.E. et al., 2016AJ....152...13H HAQC (1,1) : High AV in COSMOS, Heintz K.E. et al., 2016A&A...595A..13H HE2QS (103,103) : HeII quasar survey, Schmidt T.M. et al., 2017, Cat. J/ApJ/847/81 HE2QS2 (5,5) : HeII HST/COS quasars, Worseck G. et al., 2019ApJ...875..111W HEINTZ (1,1) : dusty absorbed QSO, Heintz K.E. et al., 2018A&A...615A..43H HIZ7.5 (1,1) : QSO z=7.5, Banados E. et al., 2018Natur.553..473B HSC (3,3) : Low-luminosity QSOs, Niida M. et al., 2020ApJ...904...89N HSTvar (42,42) : variable AGN, Pouliasis E. et al., 2019, Cat. J/MNRAS/487/4285 ICECUB (9,12) : IceCube spectra, Paiano S. et al., 2021,arXiv:2104.05290 IGMCP (10,10) : IGM close pairs, Rorai A. et al., 2017Sci...356..418R IKEDA (1,1) : Ikeda H. et al., 2017ApJ...846...57I IMDS (3,3) : IR medium-deep hi-z VII, Shin S. et al., 2020ApJ...893...45S IMS (1,1) : IR medium-deep hi-z, Kim Y. et al., 2015ApJ...813...35H IMS2 (10,11) : IR medium-deep hi-z, Kim Y. et al., 2019ApJ...870...86K INAF (1,1) : UV bright hi-z, Grazian A. et al., 2020ApJ...897...94G JERAM (1,1) : extremely bright, Jeram S. et al., 2020ApJ...899...76J JPLUS (24,24) : luminous Ly, Spinoso D. et al., 2020, Cat. J/A+A/643/A149 K4K (2,2) : K4000 bz, Uwitonze/Nkundabakura/Mutabazi, 2020, arXiv:2004.03154 KHOR1 (7,6) : 3XMM hi-z, Khorunzhev G.A. et al., 2017,AstL,43,135 KHOR2 (11,11) : 3XMM hi-z, Khorunzhev G.A. et al., 2019AstL...45..411K KHOR3 (1,1) : X-ray luminous, Khorunzhev G.A. et al., 2021, arXiv:2104.05142 KODQ3 (4,4) : KODIAQ DR3, O'Meara J.M. et al., 2020,arXiv:2010.09061 KOVACS (1,1) : bright QSO behind Milky Way, Kovacs T. et al., 2019, RNAAS, 3, 3 LAMDR6 (2966,3341) : LAMOST-DR6, pipeline, http://dr6.lamost.org LAMQ1 (684,625) : LAMOST QUASAR DR1, Ai Y.L. et al., 2016, Cat. J/AJ/151/24 LAMQ3 (6698,6587) : LAMOST QUASAR DR3/DR2, Dong X.Y. et al., 2018, Cat. J/AJ/155/189 LAMQ5 (7938,7937) : LAMOST QUASAR DR5/DR4, Yao S. et al., 2019ApJS..240....6Y LEMON (40,40) : 24 Gaia lenses, Lemon C. et al., 2018MNRAS.479.5060L LEMON2 (30,30) : 22 Gaia lenses, Lemon/Auger/McMahon, 2019MNRAS.483.4242L LEMON3 (53,52) : STRIDES lenses etc, Lemon C. et al., 2020MNRAS.494.3491L LGGS (11,11) : M31/M33 area, Massey/Neugent/Levesque, 2019AJ....157..227M LIDMAN (1,1) : SN Host Galaxy redshifts, Lidman C. et al., 2013PASA...30....1L LIN (1,1) : DES lens, Lin H. et al., 2017ApJ...838...15L LIRAS (169,154) : LoCuSS IR AGNs, Xu, L. et al., 2015, Cat. J/ApJS/219/18 LOZAGN (38,10997) : Low-redshift AGN, Liu H.-Y. et al., 2019, Cat. J/ApJS/243/21 LSSA (2,1) : 2 lenses, Lucey/Schechter/Smith/Anguita, 2018MNRAS.476..927L LUMIz5 (66,66) : Luminous hi-z, Yang J. et al., 2019ApJ...871..199Y M31UV (1,1) : UV flare QSO on M31, Meusinger H. et al., 2010A&A...512A...1M MALS-N (69,68) : MEERKAT QSOs, Krogager J.-K. et al., 2018ApJS..235...10K MFJC (52,51) : McGreer I.D., Fan X., Jiang L. & Cai Z., 2018, Cat. J/AJ/155/131 MQ (143925,539324) : MILLIQUAS, original data in this catalog, Flesch E., 2021 NBCKDE (2559,2656) : Richards G.T. et al., 2009, Cat. J/ApJS/180/67 NBCKv3 (13224,67795) : NBCKDE v3, Richards G.T. et al., 2015, Cat. J/ApJS/219/39 NED (5,6) : NASA/IPAC Extragalactic Database, https://ned.ipac.caltech.edu OGLE2 (2,2) : OGLE quasars, Kozlowski S. et al., 2019ApJ...878..115K OVRLAP (5,5) : SDSS overlap hi-z QSOs, Jiang L. et al., 2015AJ....149..188J OzDES (608,435) : Dark Energy SN QSOs, Tie S.S. et al., 2017AJ....153..107T OzDES2 (751,921) : DESN QSOs, Lidman C. et al., 2020MNRAS.496...19L P352-1 (1,1) : P352-15, Banados E. et al., 2018ApJ...861L..14B PETERS (245,268) : photo special., Peters C.M. et al, 2015ApJ...811...95P PFTS (2,11) : blazar spectroscopy, Paiano S. et al., 2020MNRAS.497...94P PGC (12914,8) : Principal Galaxy Catalog, Paturel G. et al., 2003A&A...412...45P, Cat. VII/237 PHILLI (1,0) : MERLIN lens, Phillips P.M. et al., 2000MNRAS.319L...7P PS1 (63,63) : PAN-STARRS1 hi-z, Banados E. et al., 2016, Cat. J/ApJS/227/11 PS1hiz (1,1) : Tang, Ji-Jia et al., 2017MNRAS.466.4568T PS1MAZ (6,6) : Mazzucchelli C. et al., 2017ApJ...849...91M PSO (3,3) : PAN-STARRS z-dropouts, Venemans B.P. et al., 2015ApJ...801L..11V QLSV (21,20) : QUEST-La Silla, Sanchez-Saez P. et al., 2019ApJS..242...10S QPQ10 (70,70) : Quasar pair DB, Findlay J.R. et al., 2018ApJS..236...44F QUBRIC (91,91) : QUBRICS I, Calderone G. et al., 2019ApJ...887....2Y QUBRIX (249,252) : QUBRICS II, Boutsia K. et al., 2020ApJS..250...26B RBS (3,3) : Laporte N. et al., 2017ApJ...851...40L Redden (25,25) : Reddened QSOs, Temple M.J. et al., 2019MNRAS.487.2594R REQ4 (6,6) : Reionization-Era quasars, Yang J. et al., 2019AJ....157..236Y REQ7 (1,1) : Reionization-Era QSO z=7.5,Yang J. et al., 2020ApJ...897...14C RLQ (4,3) : Tuccillo D./Gonzalez-Serrano J.I./Benn C.R., 2015, Cat. J/MNRAS/449/2818 RSG (1,1) : Dorn-Wallenstein T.Z. & Levesque E., 2017, IAUS, 329, 376 S82X (71,75) : Stripe 82 AGN, LaMassa S.M. et al., 2019ApJ...876...50L S82XRQ (8,8) : Red Quasars, LaMassa S.M. et al., 2017ApJ...847..100L SAGE1 (1,1) : SAGE IR AGN, Hony S. et al., 2011A&A...531A.137H SCULPT (2,3) : Sculptor X-ray, Arnason R. M. et al., 2019MNRAS.485.2259A SDLENS (3,3) : SDSS Lenses, Williams P.R. et al., 2018MNRAS.477L..70W SDSSHI (6,6) : SDSS hi-z, Jiang L. et al., 2016ApJ...833..222J SELMAN (1,1) : serendipitous, Selman F.J. et al., 2020AN...341...26S SFM201 (1,1) : Schulze S. et al., 2012A&A...546A..20S SHELLQ (33,33) : Subaru hi-z, Matsuoka Y. et al., 2018PASJ...70S..35M SHELQ3 (28,28) : Subaru hi-z, Matsuoka Y. et al., 2019ApJ...883..183M SHELQS (30,30) : SHELLQS hi-z, Matsuoka Y. et al., 2018ApJS..237....5M SHELz7 (1,1) : SHELLQS z=7, Matsuoka Y. et al., 2019ApJ...872L...2M SMSSQ (2,2) : SkyMapper hi-z, Zefeng Li Z. et al., 2018,arXiv:1805.03429 SOLARZ (13,13) : AllWISE anomalies, Solarz A. et al., 2020A&A...642A.103S SPIN18 (1,1) : KiDS-SQuaD lens, Spiniello C. et al., 2018MNRAS.480.1163S SPIN19 (2,2) : 2 lensed quasars, Spiniello C. et al., 2019MNRAS.485.5086S SQLS (60,51) : SDSS DR7 QSO Lens Search, Inada N. et al., 2012, Cat. J/AJ/143/119 SQUAD (13,13) : UVES DB DR1, Murphy M.T. et al., 2019MNRAS.482.3458M SSLENS (3,3) : South sky lenses, Spiniello C. et al., 2019MNRAS.483.3888S SUV (22,22) : SDSS-ULAS/VHS QSOs, Yang J. et al., 2017AJ....153..184Y SXDF (39,39) : Subaru-XMMDF redshifts, Simpson C. et al., 2012, Cat. J/MNRAS/421/3060 SXDS (307,306) : Subaru-XMMDF spectra, Akiyama M. et al., 2015PASJ...67...82A ULTRA (1,1) : Ultraluminous hi-z, Wu, X.-B. et al., 2015Natur.518..512W UVQS (435,503) : UV QSOs, Monroe T.R. et al., 2016, Cat. J/AJ/152/25 VAHIZ (2,2) : VST ATLAS hi-z, Carnall A.C. et al., 2015MNRAS.451L..16C VAHIZ2 (1,1) : bright z>6 QSOs, Chehade B. et al., 2018MNRAS.478.1649C VAHIZ3 (1,1) : VST-ATLAS lens, Schechter P.L. et al., 2018, RNAAS, 2b, 21 VAQL (11,11) : VST-ATLAS quasar systems,Schechter P.L. et al., 2017AJ....153..219S VDES (8,8) : VISTA Dark Energy QSOs, Reed S.L. et al., 2017MNRAS.468.4702R VDES2 (2,2) : more VHS-DES quasars, Reed S.L. et al., 2019MNRAS.487.1874R VIKING (4,4) : VIKING IR, Venemans, G.A. et al., 2015MNRAS.453.2259V VIPERS (241,283) : VIPERS PDR-2, Scodeggio M. et al., 2018A&A...609A..84S VMC (34,34) : Magellanic IR QSOs, Ivanov V.D. et al., 2016A&A...588A..93I WARSAW (3,3) : OGLE lens, Kostrzewa-Rutkowska Z. et al., 2018MNRAS.476..663K WERTZ (1,1) : Gaia GraL lens, Wertz O. et al., 2019A&A...628A..17W WGD (2,2) : DES/Gaia lenses; Agnello A. et al., 2018MNRAS.479.4345A WILLIG (1,1) : Williger, G., 2020, p comm., data on LJMU Robotic Telescope WISEA (522905,0) : AllWISE QSO candidates, Secrest N. et al., 2015, Cat. J/ApJS/221/12 WISEHI (72,70) : Hi-z QSOs from WISE, Wang F. et al., 2016, Cat. J/ApJ/819/24 WOLF1 (1,0) : most ultraluminous QSO, Wolf C. et al., 2018PASA...35...24W WOLF2 (16,16) : hi-z ultraluminous QSOs, Wolf C. et al., 2020MNRAS.491.1970W WYFH (1,1) : z=7.642 quasar, Wang F. et al., 2021,arXiv:2101.03179 XDQSO (20119,0) : SDSS-XDQSO, Bovy J. et al., 2011ApJ...729..141B XLSS (306,118) : Stalin C.S. et al., 2010, Cat. J/MNRAS/401/294 XMM2 (12,12) : 2XMM-Newton cross-search, Combi J.A. et al., 2011Ap&SS.331...53C, Cat. V/138 XMMSMC (6,6) : SMC quasars, Maitral C. et al., 2019A&A...622A..29M XMSS (182,148) : Barcons X. et al., 2007, Cat. J/A+A/476/1191 XWAS (490,449) : Esquej P. et al., 2013, Cat. J/A+A/557/A123 YQLF (25,25) : deep CFHT QSOs, Yang J. et al., 2018, Cat. J/AJ/155/110 YSZ (0,414) : Type 2 QSOs IDd, Yuan/Strauss/Zakamska, 2016,arXiv:1606.04976 z6.51 (1,1) : lensed quasar z=6.51, Fan X. et al., 2019ApJ...870L..11F z6.82 (1,1) : radio-loud z=6.82, Banados E. et al., 2021,arXiv:2103.03295 z7.02 (1,1) : lensed quasar z=7.02, Wang F. et al., 2018ApJ...869L...9W 4-digit numeric citations are indexed in the HMQ (2015PASA...32...10F) references list. The citation for the classification (e.g., that the object is a quasar) is from either the name or redshift citation. Note (9): For QSO candidates (class starting with q/R/X/2) this shows its pQSO (percent chance that it is a QSO) based on radio/X-ray association and/or photometric analysis. Radio/X-ray based likelihoods are calculated as described in Flesch & Hardcastle, 2004A&A...427..387F. WISEA photometric pQSOs are calibrated all-sky via the colours B-R, R-W1, W1-W2, and W2-W3, using the method of Flesch 2015PASA...32...10F, Appendix 2. SDSS-based candidates from NBCKDE/NBCKv3/XDQSO/Peters (see Note 7 for citations) photometric catalogs can also have photometric-based pQSOs which are here calibrated against SDSS-DR16Q classified objects using 4-colour matching. The calibrated photometric pQSO (P1) and radio/X-ray derived pQSO (P2), if both present, are combined into a single pQSO as pQSO = 1/(1+((1-P1)*(1-P2))/(P1*P2)). For a fully classified object (class starting with Q/A/B/K/N/L), this shows the percent chance that a shown radio/X-ray detection(s) is truly associated to it. If no radio/X-ray detection, value is blank. Note (10): Four columns of Radio/X-ray detections are presented: * 1st column: best X-ray detection (i.e. highest probability association). * 2nd column: best core Radio detection. * 3rd column: a radio lobe if the description (see note 2) shows a "2", otherwise this is an additional radio or X-ray detection. * 4th column: a radio lobe if the description (see note 2) shows a "2", otherwise this is an additional radio or X-ray detection. Legend of Radio/X-ray detection prefixes and catalog home pages: FIRST: VLA FIRST survey, 13Jun05 version, http://sundog.stsci.edu VL0 (abbrev of VLASS1QLCIR): VLASS Quick Look, https://cirada.ca/catalogues NVSS: NRAO VLA sky survey, http://www.cv.nrao.edu/nvss SUMSS: Sydney U. Molonglo, http://www.astrop.physics.usyd.edu.au/sumsscat/ MGPS: Molonglo galactic plane, www.astrop.physics.usyd.edu.au/mgpscat/ ROSAT catalogs available from http://cdsarc.u-strasbg.fr/cats/IX.htx are: - IX/28A is 1RXH: ROSAT HRI (high resolution imager) - IX/30 is 2RXP: ROSAT PSPC (position sensitive proportional counter) - IX/10A & IX/29 are 1RXS: ROSAT RASS (all-sky survey, bright & faint) 2RXF: https://heasarc.gsfc.nasa.gov/W3Browse/rosat/rospspcftot.html 2RXS: 2nd RASS source catalog, http://www.mpe.mpg.de/ROSAT 1WGA: White, Giommi & Angelini, wgacat.gsfc.nasa.gov/wgacat/wgacat.html CXOG: Chandra ACIS source catalog, Wang S. et al., 2016,ApJS,224,40 CXO: Chandra Source Catalog v1.1, http://cxc.harvard.edu/csc 2CXO: Chandra Source Catalog v2, http://cxc.harvard.edu/csc CXOX: XAssist Chandra source list, http://xassist.pha.jhu.edu/ 2XMM/2XMMi: XMM-Newton DR3, http://cdsarc.u-strasbg.fr/cats/IX.htx IX/39&40 4XMM: XMM-Newton DR10, https://www.cosmos.esa.int/web/xmm-newton/xsa XMMSL: XMM-Newton Slew Survey Release 2.0, same attribution as 4XMM XMMX: XAssist XMM-Newton source list, http://xassist.pha.jhu.edu/ 2SXPS: Swift X-ray Point Source catalog, http://www.swift.ac.uk/2SXPS Optical field solutions are calculated from the raw source positions of all these catalogs (except 2CXO) as described in my MORX paper, Flesch, 2016PASA...33...52F.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 4 I04 --- Ref Reference number 6- 11 I6 ---- N1 ? Number of this reference for Name 13- 18 I6 --- N2 ? Number of this reference for redshift 21- 39 A19 --- Bibcode BibCode 41- 71 A31 --- Aut Author's name 73-162 A90 --- Com Comments
Acknowledgements: If using this catalogue in published research, please cite as Milliquas v7.2, Flesch, E.W. 2021, arXiv:2105.12985 , or as Milliquas v7.2 (2021) update, Flesch, E.W. 2015PASA...32...10F. The confirmed quasars of this catalog (to Jan 2015) were published as the Half Million Quasars (HMQ) catalog: Flesch E., 2015PASA...32...10F. Note however that Milliquas uses optical sky data from ASP (2017PASA...34...25F) whereas the HMQ used optical sky data from QORG (2004A&A...427..387F, Cat. J/A+A/427/387) Appendix A. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory,California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the SIMBAD database and CDS cross-match service (to obtain Gaia DR2 data) provided by CDS, Strasbourg, France. History: From Eric Flesch, eric(at)flesch.org ================================================================================ (End) Patricia Vannier [CDS] 03-May-2021