ACDS V10.0 - Detailed Description of VII/280

ACDS V10.0 - Fri May 03 05:54:55 CEST 2019

| # Detailed Description of VII/280 : The Million Quasars (Milliquas) catalog (V5.2) (Flesch, 2017) |

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/280          The Million Quasars (Milliquas) catalog (V5.2)   (Flesch, 2017)
    ================================================================================
    The Million Quasars (Milliquas) catalogue, version 5.2.
         Flesch E.W.
         <Pub. Astron. Soc. Australia 32, 10 (2015)>
       =2015PASA...32...10F
       =2017yCat.7280....0F
    ================================================================================
    ADC_Keywords: QSOs ; Active gal. nuclei ; Redshifts ; Magnitudes

    Keywords: catalogs - quasars: general

    Description:
        This is a compendium of 607,208 type-I QSOs and AGN, largely complete
        from the literature to 5-August-2017, including the release of
        SDSS-DR14. Also included are ~1.35M high-confidence (80%+
        likelihood) quasar candidates from the NBCKDE, NBCKDE-v3, XDQSO,
        AllWISE and Peters photometric quasar catalogs (citations in Note 7
        below) and from all-sky radio/X-ray associated objects which are
        calculated here. Type-II and Bl Lac objects are also included,
        bringing the total count to 1,998,464.

     Changes from version 5.1 are:
     (1) SDSS-DR14 and SDSS-DR14Q have been added, using the processing
          rules from the Half Million Quasars catalog (HMQ: Flesch
          2015PASA...32...10F).

     (2) WISE quasar candidates have been added from Secrest et al,
          2015, Cat. J/ApJS/221/12; these are ~430K candidates over the
         whole sky for which 2-color optical objects were found within a
         2-arcsec radius. They have been processed into pQSOs from calibration
         against the SDSS-DR12Q multi-class superset, and photometric redshifts
         obtained using the four-color based method from the HMQ appendix 2.
         The four colors used were B-R, R-W1, W1-W2 & W2-W3. (3) Type-II narrow
         emission-line galaxies, (NELGs, class='N') are added as the luminosity
         class corresponding to the type-I AGN galaxies. High-luminosity
         type-II NLAGN (class='K') correspond to the type-I quasars. The
         NLAGN/NELG divider is the same luminosity/psf function which separates
         QSOs from AGNs. Type-II NELGs include unquantified contamination by
         LINERs and probably a few starbursts which eluded removal, so it
         serves as a catch-all category presented for completeness, rather than
         as a strict type-II class. (4) Small publications to 5 August 2017
         have been added. (5) Positional fixes (of about 2 arcsec) have been
         applied to ~150 objects. Low-confidence or questionable objects (so
         deemed by their researchers) are not included in Milliquas. Additional
         quality cuts can be applied as detailed in Flesch 2015PASA...32...10F).
         Multiple lensed images are excluded and only the brightest one kept.
         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.

        This catalog can be cited as Milliquas, Flesch E., 2015PASA...32...10F
        which was the published version of this catalog as at 2015 after the
        release of SDSS-DR12.

        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  1998464   The Milliquas catalogue, V5.2 (5 August 2017)

    See also:
     VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)
     VII/277 : The Million Quasars (Milliquas) catalogue, V4.8 (Flesch, 2016)

    Byte-by-byte Description of file:  catalog.dat

       Bytes Format Units   Label    Explanations

       1- 11  F11.7 deg     RAdeg    Right ascension (J2000) (1)
      13- 23  F11.7 deg     DEdeg    Declination (J2000) (1)
      26- 50  A25   ---     Name     ID from the literature, or J2000 (2)
          52  A1    ---     Cl       [ABKQqN] classification of object (3)
      53- 55  A3    ---     Assoc    [2RX ] Summary of associations for object (4)
      57- 61  F5.2  mag     Rmag     Red optical magnitude (5)
      63- 67  F5.2  mag     Bmag     Blue optical magnitude (5)
      69- 71  A3    ---     Comment  Comment on optical object (6)
          73  A1    ---     R        Red optical PSF class (7)
          75  A1    ---     B        Blue optical PSF class (7)
      77- 82  F6.3  ---     z        ? Redshift from the literature or estimated (8)
      84- 89  A6    ---     r_Name   Citation for name (9)
      91- 96  A6    ---     r_z      Citation for redshift (9)
      98-100  I3    pct     Qpct     ? Probability that this object is a QSO (10)
     102-123  A22   ---     XName    X-ray ID, if any (11)
     125-146  A22   ---     RName    Radio ID, if any (11)
     148-169  A22   ---     Lobe1    Radio lobe ID or extra R/X ID, if any (11)
     171-192  A22   ---     Lobe2    Radio lobe ID or extra X-ray ID, if any (11)

    Note (1): These are to 7 decimals which is too precise, but which accomodates a
      miniscule round-up which prevents inadvertent truncation by the user when
      converting to sexagesimal.
    Note (2): Nameless radio/X-ray associated objects here display 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 J000001.5-251706.
    Note (3): Classification of object as follows:
      Q = QSO, type I broad-line unresolved, 577146 of these.
      A = AGN, type I Seyferts/host-dominated, 30062 of these.
      B = BL Lac object, 1615 of these.
      q = photometric quasar candidate from SDSS or WISE, 1297111 of these.
      N = type-II narrow-line Seyfert/NELG galaxy, 38110 of these. This class
           includes an unknown number of LINERs, presented for completeness.
      K = type-II narrow-line NLAGN, quasar-like high luminosity, 1355 of these.
    Note (4): Summary of associations for object as follows:
      R = Radio association displayed.
      X = X-ray association displayed.
      2 = Double radio lobes displayed (declared by data-driven algorithm).
    Note (5): Optical data is 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 have been recalibrated from the original values as
      documented in QORG (2004,A&A,427,387), so such USNO-A magnitudes are often
      used in preference to USNO-B. APM galaxies < mag 17 are usually shown
      too bright due to PSF modelling. Integer magnitudes (e.g., 22.00) can be
      estimates if both bands are integer or one band empty. Note: many SDSS
      magnitudes are "extinction-corrected" ~0.3 mag brighter than observed.
    Note (6): Comment on optical object legend as follows:
      p = optical magnitudes are POSS-I O (violet 4050Å) and E (red 6400Å).
           These are preferred because O is well-offset from E, and these plates
           were always taken on the same night, thus the red-blue color is
           correct even for variable objects.
      j = blue magnitude is SERC J (Bj 4850A blue-green) from the POSS-II or
           UKST surveys. Red-blue color is less reliable because the plates were
           taken in different epochs, i.e. years apart.
      g = blue magnitude is SDSS green 4900A, red is SDSS r 6200A.
      u = blue magnitude is SDSS ultraviolet 3850A.
      b = blue magnitude is Vega 4400A (Johnson).
      v = red magnitude is visual., ie, white, 5500A midpoint.
      i = red magnitude is infrared 7500A.
      z = red magnitude is infrared z 8500A.
      (not v/i/z) = standard red 6400A (Cousins).
      + = variability nominally detected in both red/blue, over multi-epoch data.
      m = proper motion nominally detected, from USNO-B.
      a = object is an SDSS galaxy with AGN subclass. If also BROADLINE then
           Milliquas class is 'A', otherwise 'N' (see note 3).
      ? = identification uncertain (quasar may be located elsewhere, 4 of these).
    Note (7): The APM, USNO-B, and SDSS provide PSF class, albeit using different
      criteria. These are shown here as follows:
      - = 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 color (fainter than plate depth, or confused, etc.)
    Note (8): Photometric redshifts (for objects classified as 'q') are here rounded
      to 0.1 z. The XDQSO catalog does not provide photometric redshifts, so
      those are provided either by NBCKDE or by this catalog using the method
      detailed in Appendix 2 of my HMQ paper (2015PASA...32...10F). AllWISE
      photometric redshifts are similarly calculated using the four colors B-R,
      R-W1, W1-W2 and W2-W3, and are displayed where calculated as 50%+ likely to
      be true within 0.5z of the displayed redshift value -- usual likelihood is
      more like 80%.
    Note (9): Legend (with counts of name and redshift) and references:
      2dF (366,232)         : 2dF galaxy survey, Colless M. et al.,
                               2001MNRAS.328.1039C, Cat. VII/250
      2QZ (27515,24161)     : Croom S.M. et al., 2004MNRAS.349.1397C, Cat. VII/241
      2SLAQ (10388,8717)    : Croom S.M. et al., 2009, Cat. J/MNRAS/392/19
      3LAC (30,28)          : FERMI AGN v3, Ackermann M. et al.,
                               2015, Cat. J/ApJ/810/14
      6dF (287,227)         : 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 (2047,2047)      : AGES survey, Kochanek C.S. et al.,
                               2012, Cat. J/ApJS/200/8
      ATLAS (229,269)       : Mao M.Y. et al., 2012, Cat. J/MNRAS/426/3334
      BASS (15,124)         : Swift-BAT AGN, Koss M. et al.,
                               2017,arXiv:1707.08123, ApJ
      BQLS (9,9)            : BOSS QSO lenses & pairs, More A. et al.,
                               2016MNRAS.456.1595M
      C-COSM (180,180)      : Chandra COSMOS IDs, Marchesi S. et al.,
                               2016ApJ...817...34M
      ChaMP (191,188)       : Trichas M. et al., 2012ApJS..200...17T
      DES (1,1)             : Dark Energy hi-z, Reed S.L. et al.,
                               2015MNRAS.454.3952R
      DPeake (7,3450)       : Double-peaked NELGs, Ge J.-Q. et al.,
                               2012, Cat. J/ApJS/201/31
      DR12 (1628,5332)      : Alam S. et al., 2015ApJS..219...12A,
                               http://sdss.org/dr12, Cat. V/147
      DR12Q (233,415)       : SDSS-DR12Q, Paris I. et al., 2017A&A...597A..79P,
                               Cat. VII/279
      DR14 (32900,40157)    : Abolfathi B. et al., 2017,arXiv:1707.09322, data at
                               https://data.sdss.org/sas/dr14/sdss/spectro/redux
      DR14Q (512359,525951) : SDSS-DR14Q, Paris I. et al., 2017, in preparation,
                               data at http://data.sdss.org/sas/dr14/eboss/qso/DR14Q
      DR7 (6378,4872)       : SDSS DR7, Abazajian K.N. et al., 2009ApJS..182..543A,
                               files at
                       http://classic.sdss.org/dr7/products/spectra/getspectra.html
      DR7Q (2128,340)       : SDSS Quasar DR7, Schneider D. et al.,
                               2010AJ....139.2360S, Cat. VII/260
      DUHIZ (2,2)           : DECaLS-UKIRT hi-z, Wang F. et al., 2017ApJ...839...27W
      eHAQ (82,81)          : Extended High AV, Krogager J.-K., 2016ApJ...832...49K
      GLDD (1,1)            : Lensed QSO data-driven, Ostrovski F. et al.,
                               2017MNRAS.465.4325O
      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
      HMQ (28638,22897)     : Half Million Quasars catalog, Flesch E.,
                               2015PASA...32...10F, Cat. VII/273, references
                               therein to the original authors & papers.
      IGMCP (10,10)         : IGM close pairs, Rorai A. et al., 2017Sci...356..418R
      IMS (1, 1)            : IR medium-deep hi-z, Kim Y. et al.,
                               2015ApJ...813...35H
      IKEDA (1,1)           : Ikeda H. et al., 2017, arXiv:1708.00314, ApJ accepted
      LAMOST (4314,3786)    : LAMOST-DR3, http://dr3.lamost.org
      LIDMAN (1,1)          : SN Host Galaxy redshifts, Lidman C. et al.,
                               2013PASA...30....1L
      LIRAS (168,158)       : LoCuSS IR AGNs, Xu, L. et al.,
                               2015, Cat. J/ApJS/219/18
      MORX (49916,0)        : Million Radio/X-ray Associations, Flesch E.,
                               2016PASA...33...52F, Cat. V/148
      MQ (3144,635633)      : MILLIQUAS, original data in this catalog,
                               Flesch E.,2017
      MZZ (9,9)             : Marano B., Zamorani G., Zitelli V.,
                               1988MNRAS.232..111M
      NBCKDE (40679,40679)  : Richards G.T. et al., 2009, Cat. J/ApJS/180/67
      NBCKv3 (576782,576782): NBCKDE v3, Richards G.T. et al.,
                               2015, Cat. J/ApJS/219/39
      OVRLAP (5,5)          : SDSS overlap hi-z QSOs, Jiang L. et al.,
                               2015AJ....149..188J
      OzDES (664,638)       : Dark Energy SN QSOs, Tie S.S. et al.,
                               2017AJ....153..107T
      PETERS (12952,12952)  : photo special, Peters C.M. et al.,
                               2015ApJ...811...95P
      PGC (13548,8)         : Principal Galaxy Catalogue, Paturel G. et al.,
                               2003A&A...412...45P, Cat. VII/237
      PS1 (63,63)           : PAN-STARRS1 hi-z, Banados E. et al.,
                               Cat. J/ApJS/227/11
      PSO (3,3)             : PAN-STARRS z-dropouts, Venemans B.P. et al.,
                               2015ApJ...801L..11V
      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,arXiv:1701.07888
      SDSSHI (6,6)          : SDSS hi-z, Jiang L. et al., 2016ApJ...833..222J
      SFM201 (1,1)          : Schulze S. et al., 2012A&A...546A..20S
      SHELLQ (33,33)        : Subaru hi-z, Matsuoka Y. et al.,
                               2017,arXiv:1704.05854, PASJ
      SUV (21,21)           : SDSS-ULAS/VHS QSOs, Yang J. et al., 2017,AJ,153,184
      SXDF (39,39)          : Subaru-XMMDF redshifts, Simpson C. et al.,
                               2012, Cat. J/MNRAS/421/3060
      SXDS (310,309)        : 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 (433,517)        : UV QSOs, Monroe T.R. et al., 2016,AJ,152,25
      VAHIZ (2,2)           : VST ATLAS hi-z, Carnall A.C. et al.,
                               2015MNRAS.451L..16C
      VDES (8,8)            : VISTA Dark Energy Qsos, Reed S.L. et al.,
                               2017MNRAS.468.4702R
      VIKING (4,4)          : VIKING IR, Venemans, G.A. et al., 2015MNRAS.453.2259V
      VIPERS (241,285)      : VIPERS PDR-2, Scodeggio M. et al.,
                               2016, arXiv:1611.07048
      VMC (34,34)           : Magellanic IR QSOs, Ivanov V.D. et al.,
                               2016A&A...588A..93I
      WARREN (1,1)          : Warren S.J. et al., 2017, in preparation
      WISEA (430999,0)      : 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
      XDQSO (235694,0)      : SDSS-XDQSO, Bovy J. et al., 2011ApJ...729..141B
      XLSS (307,120)        : Stalin C.S. et al., 2010, Cat. J/MNRAS/401/294
      XMSS (182,150)        : 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

      The citation for the classification (e.g., that the object is a quasar) can
      be from either the name or redshift citation.
    Note (10):  For a QSO candidate (type starting with q/R/X/2), this shows the
      percent chance that it is a QSO, based on photometric and/or radio/X-ray
      association analysis. Included candidates are those of 80%+ likelihood
      of being true quasars. For a known QSO (type=Q/A), Bl Lac type (type=B)
      or type-II (type=K/N), this shows the percent chance that the shown
      radio/X-ray detection(s) is truly associated to it.

      Candidates (objects without spectroscopic confirmation) consist of three
      separate classes of objects:

      (1) Photometric quasars from the SDSS-based NBCKDE/NBCKDE-v3/XDQSO/Peters
           quasar candidate catalogs. Those catalogs give pQSOs (calculated QSO
           probabilities) for their objects which however are not reported here;
           instead, I have calibrated those pQSOs against SDSS-DR12Q classified
           objects to produce these QSO likelihoods -- see appendix 1 of my HMQ
           paper (Flesch 2015PASA...32...10F) for details of the calibration
           method.

      (2) WISE-sourced candidates are presented by their authors with a bulk pQSO
           as an average figure, with no individual pQSOs given. These I have
           generated by matching WISE candidates to optical objects (within a two
           arcsecond radius) and then dividing them into four-color (the colors
           being B-R, R-W1, W1-W2 & W2-W3) subsets which are then calibrated
           against SDSS-DR12Q classified objects to yield the pQSO for each subset.

      (3) Radio/X-ray associated objects, totalling 53065 without any other
           attribution. The likelihoods of being a true QSO are calculated as
           described in the QORG paper (Flesch & Hardcastle, 2004A&A...427..387F,
           Cat. J/A+A/427/387).

       69609 photometric quasars are also radio/X-ray associated, and the
       displayed probability figure combines the calibrated photometric QSO
       likelihood P1 and the radio/X-ray derived QSO likelihood P2 as
       P = 1/(1+((1-P1)*(1-P2))/(P1*P2)). Over all objects, using the probability
       as expected yield, the 1957384 type-I Milliquas objects will yield 1901076
       actual type-I quasars/AGNs, so making this a true million quasars catalog.
    Note (11): 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 3) shows a "2",
                      otherwise this is an additional radio or X-ray detection.
       * 4th column: a radio lobe if the description (see note 3) shows a "2",
                      otherwise this is an additional X-ray detection.

       Legend of Radio/X-ray detection prefixes and catalog home pages:

       FIRST: VLA FIRST survey, 13Jun05 version, http://sundog.stsci.edu
       NVSS: NRAO VLA sky survey, http://www.cv.nrao.edu/nvss
       SUMSS: Sydney U. Molonglo, http://www.physics.usyd.edu.au/sifa/Main/SUMSS
       MGPS: Molonglo galactic plane survey, same attribution as SUMSS
       ROSAT catalogs home page: www.mpe.mpg.de/xray/wave/rosat/catalogue,
         for:
         - 1RXH: ROSAT HRI (high resolution imager)
         - 2RXP/2RXF: ROSAT PSPC (position sensitive proportional counter)
         - 1RXS: ROSAT RASS (all-sky survey, both bright & faint)
       2RXS: 2nd RASS source catalog, Boller Th. et al., 2016,A&A,588,103
       1WGA: White, Giommi & Angelini, wgacat.gsfc.nasa.gov/wgacat/wgacat.html
       CXO: Chandra Source Catalog v1.1, http://cxc.cfa.harvard.edu/csc
       CXOG: Chandra ACIS source catalog, Wang S. et al., 2016,ApJS,224,40
       CXOX: XAssist Chandra source list, http://xassist.pha.jhu.edu/zope/xassist
       2XMM/2XMMi: XMM-Newton DR3, http://xmm.esac.esa.int/xsa/versions.shtml
       3XMM: XMM-Newton DR7, http://www.cosmos.esa.int/web/xmm-newton/xsa
       XMMSL: XMM-Newton Slew Survey Release 2.0, same attribution as 3XMM
       XMMX: XAssist XMM-Newton source list, xassist.pha.jhu.edu/zope/xassist
       1SXPS: Swift X-ray Point Source catalog, http://www.swift.ac.uk/1SXPS

       Optical field solutions are calculated from the raw source positions of all
       these catalogs as described in my MORX paper 2016PASA...33...52F.

    Acknowledgements:
       If using this catalogue in published research, please so cite. The confirmed
       quasars of this catalog (to Jan 2015) were published as the Half Million
       Quasars (HMQ) catalog:  Flesch E., 2015PASA...32...10F, which can be used as
       the citation.

       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.

    History:
        Copied at http://quasars.org/milliquas.htm
        Contact: Eric Flesch, eric(at)flesch.org
    ================================================================================
    (End)                                      Patricia Vannier [CDS]    21-Aug-2017