ACDS V10.0 - Detailed Description of II/335

ACDS V10.0 - Fri Jan 17 08:43:00 CET 2025

| # Detailed Description of II/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 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.

    II/335  Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7)  (Bianchi+ 2017)
    ================================================================================
    Revised catalog of GALEX ultraviolet sources.
    I. The All-Sky Survey: GUVcat_AIS.
        Bianchi L., Shiao B., Thilker D.
       <Astrophys. J. Suppl. Ser., 230, 24-24 (2017)>
       =2017ApJS..230...24B    (SIMBAD/NED BibCode)
       =2014AdSpR..53..900B
    ================================================================================
    ADC_Keywords: Photometry, ultraviolet ; Ultraviolet

    Mission_Name: GALEX

    Keywords: catalogs; Galaxy: stellar content; stars: AGB and post-AGB;
              stars: early-type; surveys; ultraviolet: general

    Abstract:
        The Galaxy Evolution Explorer (GALEX) imaged the sky in two
        ultraviolet (UV) bands, far-UV (FUV, {lambda}eff~1528Å), and
        near-UV (NUV, {lambda}eff~2310Å), delivering the first
        comprehensive sky surveys at these wavelengths. The GALEX database
        contains FUV and NUV images, ~500 million source measurements and over
        100000 low-resolution UV spectra. The UV surveys are a unique resource
        for statistical studies of hot stellar objects, z<~2 QSOs,
        star-forming galaxies, nebulae and the interstellar medium, and
        provide a roadmap for planning future UV instrumentation and follow-up
        observing programs. We present science-enhanced, "clean" catalogs of
        GALEX UV sources, with useful tags to facilitate scientific
        investigations. The catalogs are an improved and expanded version of
        our previous catalogs of UV sources (BCScat; Bianchi+, 2011,
        J/MNRAS/411/2770 ; II/312 and 2014AdSpR..53..900B). With respect to
        BCScat, we have patched 640 fields for which the pipeline had
        improperly coadded non-overlapping observations, and we provide a
        version with a larger sky coverage (about 10%) by relaxing the
        restriction to the central area of the GALEX field to 1.1°
        diameter (GUVcatAISfov055: GUVcat_AIS FOV_radius <0.55°), as
        well as the cleaner, more restrictive version using only the 1°
        central portion of each field as in BCScat (GUVcatAISfov050:
        GUVcat_AIS FOV_radius <0.50°). We added new tags to facilitate
        selection and cleaning of statistical samples for science
        applications: we flag sources within the footprint of extended objects
        (nearby galaxies, stellar clusters) so that these regions can be
        excluded for estimating source density. As in our previous catalogs,
        in GUVcat duplicate measurements of the same source are removed, so
        that each astrophysical object has only one entry. Such a
        unique-source catalog is needed to study the density and distributions
        of sources, and to match UV sources with catalogs at other
        wavelengths. The catalog includes all observations from the All-Sky
        Imaging Survey (AIS), the survey with the largest area coverage, with
        both FUV and NUV detectors exposed: over 28700 fields, made up of a
        total of 57000 observations ("visits"). The total area covered, when
        overlaps are removed and gaps are accounted for, is 24790 square
        degrees for GUVcatAISfov055 (GUVcatAISfov055) and 22125 square
        degrees for (GUVcatAISfov050). The total numbers of "unique" AIS
        sources (eliminating duplicate measurements) are 82,992,086
        (GUVcatAISfov055) and 69,772,677 (GUVcatAISfov050). The typical
        depth of the GUVcat_AIS catalog is FUV=19.9, NUV=20.8 AB mag.

    Description:
        The Galaxy Evolution Explorer (GALEX) was a NASA Small Explorer
        mission which imaged the sky in 2 ultraviolet bands, FUV (far-UV) and
        NUV (near-UV) and provided the first UV sky surveys. It was launched
        on 2003 April 28 and decommissioned by NASA on 2013 June 28.

        Its characteristics are:
        --------------------------------------------------------------------
                                FUV         NUV
        --------------------------------------------------------------------
        Bandwidth            1344-1786  1771-2831 (Å)
        Effective wavelength 1538.6     2315.7    (Å)
        Astrometry (R<0.6deg)   0.59       0.49   (arcsec)
        Photometry (1 sigma)    0.05       0.03   (ABmag)
        Zero point             18.82      20.08   (ABmag)
        Image resolution        4.2        5.3    (arcsec/pix)
        Spectral resolution     200       118     ({delta}{lambda}/{lambda})
        Field of view           1.28       1.24   (deg)
        --------------------------------------------------------------------

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × galex_ais.sam   1455     1000   Sample of the revised GALEX catalog of UV sources
                                    (GUVcat_AIS) from GR6+7 (82,992,086 sources)
    × table2.dat       139      381   List of clusters included in the GUVcat footprint
    × table3.dat       133    15659   List of galaxies larger than 1' included in
                                    the GUVcat footprint
    × table4.dat       126    29535   List of AIS GALEX fields used to construct
                                    the GUVcat AIS catalog
    × table5.dat       206     2004   List of AIS eliminated bad coadds, and
                                    their associated visits

    See also:
     II/312 :  GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
     J/ApJS/173/185   : GALEX UV atlas of nearby galaxies (Gil de Paz+, 2007)
     J/ApJS/173/572   : GALEX/Spitzer photometry in NGC 7331 (Thilker+, 2007)
     J/AJ/137/3761    : Ultraviolet quasi-stellar objects (Bianchi+, 2009)
     J/ApJ/703/614    : UV star-forming regions in M31 (Kang+, 2009)
     J/ApJ/730/88     : Star-forming regions in NGC 6822 from UV (Efremova+, 2011)
     J/MNRAS/411/2770 : Hot white dwarfs in GALEX-DR5 (Bianchi+, 2011)
     http://galex.stsci.edu/ : the GALEX database in MAST (STScI)
     http://dolomiti.pha.jhu.edu/uvsky/ : GALEX science catalogs and tools
     http://www.galex.caltech.edu/ : the GALEX home page at Caltech

    Byte-by-byte Description of file:  galex_ais.sam

       Bytes Format Units   Label     Explanations

       1- 10  F10.6 deg     RAdeg     Source's right ascension (J2000) (RA)
      12- 21  F10.6 deg     DEdeg     Source's declination (J2000) (DEC)
      23- 44  A22   ---     Name      GALEX identifier in JHHMMSS.s+DDMMSS format;
                                      column added by CDS
      46- 64  I19   ---     objid     GALEX identifier for the source (objid)
      66- 84  I19   ---     phID      Pointer to photoExtract Table
                                      (id of original observation on which
                                      the measurement was taken) (photoextractid)
      86- 88  A3    ---     Cat       Survey type (always "AIS"
                                      = All-sky Imaging Survey) (mpstype)
      90- 99  F10.6 deg     RAfdeg    RA of center of field (avaspra)
     101-110  F10.6 deg     DEfdeg    DE of center of field (avaspdec)
     112-117  F6.2  s       FUVexp    [30/709] FUV exposure time
     119-125  F7.2  s       NUVexp    [30/1134] NUV exposure time
     127-134  F8.4  deg     GLON      Galactic longitude
     136-143  F8.4  deg     GLAT      Galactic latitude
     145-149  I5    ---     tile      [50000/50491] Tile number (tilenum)
     151-154  I4    ---     img       [33/3172] Image number (img)
     156-157  I2    ---     sv        [1/99] Number of subvisit if exposure was
                                      divided (subvisit)
     159-166  F8.6  deg     r.fov     [/0.6] Distance of source from center of
                                      the field (fov_radius)
         168  I1    ---     Obs       [1] Observation type (1=multi) (type)
         170  I1    ---     b         [1/3] bands: 1=NUV, 2=FUV, 3=both (band)
     172-177  F6.4  mag     E(B-V)    [0.0007/0.5] E(B-V) Galactic Reddening (from
                                      Schlegel+ 1998ApJ...500..525S maps) (E_bv)
         179  I1    ---     Sp?       [0/1] 1 if a spectrum exists (istherespectrum)
         181  I1    ---     chkf      [0/1] Astrometry check type (chkobj_type)
     183-189  F7.4  mag     FUVmag    [10.6/23.8]? GALEX FUV calibrated magnitude
                                      in AB system (fuv_mag)
     191-196  F6.4  mag     e_FUVmag  [0.001/0.6]? FUV mag error (fuv_magerr)
     198-204  F7.4  mag     NUVmag    [9.6/24.5] GALEX NUV calibrated magnitude
                                      in AB system (nuv_mag)
     206-211  F6.4  mag     e_NUVmag  [0.0007/0.5] NUV mag error (nuv_magerr)
     213-219  F7.4  mag     FUV.a     [-8.2/5]? FUV Kron-like elliptical
                                      aperture magnitude (fuvmagauto)
     221-226  F6.4  mag     e_FUV.a   [0.001/0.6]? FUV RMS error for AUTO magnitude
                                      (fuvmagerrauto)
     228-235  F8.4  mag     NUV.a     [-10.5/4.4] NUV Kron-like elliptical aperture
                                      magnitude (nuvmagauto)
     237-242  F6.4  mag     e_NUV.a   [0.0007/0.5] NUV RMS error for AUTO magnitude
                                      (nuvmagerrauto)
     244-250  F7.4  mag     FUV.4     [-7.2/99]? FUV mag aperture (8 pix diameter)
                                      (fuvmagaper_4)
     252-260  F9.4  mag     e_FUV.4   [0.002/4911]? FUV mag aperture error (8 pix
                                      diameter) (fuvmagerraper_4)
     262-268  F7.4  mag     NUV.4     [-7.5/99] NUV mag aperture (8 pix diameter)
                                      (nuvmagaper_4)
     270-278  F9.4  mag     e_NUV.4   [0.001/2559] NUV mag aperture error (8 pix
                                      diameter) (nuvmagerraper_4)
     280-286  F7.4  mag     FUV.6     [-7.4/99]? FUV mag aperture (17 pix diameter)
                                      (fuvmagaper_6)
     288-297  F10.4 mag     e_FUV.6   [0.001/37286]? FUV mag aperture error (17 pix
                                      diameter) (fuvmagerraper_6)
     299-305  F7.4  mag     NUV.6     [-8.3/99] NUV mag aperture (17 pix diameter)
                                      (nuvmagaper_6)
     307-319  F13.4 mag     e_NUV.6   [0.001/15473111] NUV mag aperture error (17 pix
                                      diameter) (nuvmagerraper_6)
     321-323  I3    ---     Fafl      [0/416]? FUV artifact flag (logical OR
                                      near source) (fuv_artifact)
     325-327  I3    ---     Nafl      [0/913] NUV artifact flag (logical OR
                                      near source) (nuv_artifact)
     329-330  I2    ---     Fexf      [0/19]? Extraction flags for FUV band
                                      (fuv_flags)
     332-333  I2    ---     Nexf      [0/51] Extraction flags for NUV band
                                      (nuv_flags)
     335-346  F12.5 uJy     Fflux     [1/201899]? FUV calibrated flux (fuv_flux)
     348-358  F11.5 uJy     e_Fflux   [0.5/18719]? FUV flux error (fuv_fluxerr)
     360-371  F12.5 uJy     Nflux     [0.6/202886] NUV calibrated flux (nuv_flux)
     373-382  F10.5 uJy     e_Nflux   [0.2/3649] NUV flux error (nuv_fluxerr)
     384-390  F7.2  pix     FXpos     ? Source position in FUV image
                                      along x (fuvximage)
     392-398  F7.2  pix     FYpos     ? Source position in UV image
                                      along y (fuvyimage)
     400-406  F7.2  pix     NXpos     Source position in NUV image
                                      along x (nuvximage)
     408-414  F7.2  pix     NYpos     Source position in NUV image
                                      along y (nuvyimage)
     416-423  F8.3  pix     Fima      ? Source FWHM in FUV assuming a
                                      gaussian core (fuvfwhmimage)
     425-431  F7.3  pix     Nima      Source FWHM in NUV assuming a
                                      gaussian core (nuvfwhmimage)
     433-441  F9.6  deg     Fr        [-0.2/0.3]? Source FWHM in FUV assuming a
                                      gaussian core (fuvfwhmworld)
     442-450  F9.6  deg     Nr        [-0.1/0.5] Source FWHM in NUV assuming a
                                      gaussian core (nuvfwhmworld)
     451-456  F6.4  ---     nS/G      Star/galaxy classifier from NUV
                                      (nuvclassstar)
     458-463  F6.4  ---     fS/G      ? Star/galaxy classifier from FUV
                                      (fuvclassstar)
     465-470  F6.4  ---     nell      1-b/a in NUV (nuv_ellipticity)
     472-477  F6.4  ---     fell      ? 1-b/a in FUV (fuv_ellipticity)
     479-484  F6.2  deg     nPA       Position angle in NUV (nuvthetaj2000)
     486-491  F6.2  deg     e_nPA     [-90/] Position angle error in NUV
                                      (nuverrthetaj2000)
     493-498  F6.2  deg     fPA       ? Position angle in FUV (fuvthetaj2000)
     500-505  F6.2  deg     e_fPA     [-90/]? Position angle error in FUV
                                      (fuverrthetaj2000)
     507-520  E14.2 pix     Fnr       [/965]? FUV FWHM IMAGE value from
                                      -fd-ncat.fits (fuvncatfwhm_image) (4)
     522-535  E14.2 pix     F3r       [/1.98E7]? FUV flux radius
                                      (fuvncatfluxrad3) (4)
     537-544  F8.5  ---     Nar       [3.5/13.2] Kron apertures in units of a or b
                                      (nuvkronradius)
     546-553  F8.6  deg     Narms     [0.0002/0.1] Profile RMS along major axis
                                      (nuvaworld)
     555-562  F8.6  deg     Nbrms     [0.00004/0.06] Profile RMS along minor axis
                                      (nuvbworld)
     564-571  F8.5  ---     Far       [3.5/11]? Kron apertures in units of a or b
                                      (fuvkronradius)
     573-580  F8.6  deg     Farms     [0.0002/0.06]? Profile RMS along major axis
                                      (fuvaworld)
     582-589  F8.6  deg     Fbrms     [0.0001/0.03]? Profile RMS along minor axis
                                      (fuvbworld)
     591-595  F5.1  s       NUVw      [0/964] NUV effective exposure (flat-field
                                      response value) at the source position
                                      (nuv_weight)
     597-601  F5.1  s       FUVw      [0/700] FUV effective exposure (fuv_weight)
     603-610  E8.6  ---     Prob      ? Probability of the FUVxNUV match (prob)
     612-615  F4.2  arcsec  Sep       [0/7.1]? Separation between FUV and NUV
                                      position of the source in the same
                                      observation (sep)
     617-620  F4.2  arcsec  Nerr      [0.4/3.3] Position error of the source in the
                                      NUV image (nuv_poserr)
     622-625  F4.2  arcsec  Ferr      [0.4/2.4]? Position error of the source in
                                      the FUV image (fuv_poserr)
     627-630  F4.2  arcsec  Ierr      [0.4/3.4]? Inter-band position error
                                      (ib_poserr)
     632-635  F4.2  arcsec  Nperr     [0.001/2.8] NUV Poisson position error
                                      (nuv_pperr)
     637-640  F4.2  arcsec  Fperr     [0.001/1.6]? FUV Poisson position error
                                      (fuv_pperr)
         642  A1    ---     CV        [CV] Whether the source comes from a coadd or
                                      visit (corv)
     644-645  I2    ---     G         [-1/1] Neighbours rank (grank) (1)
     647-648  I2    ---     N         [1/12] Number of sources within 2.5", if this
                                      is a primary (ngrank)
     650-668  I19   ---     primid    objid of the primary (only of use for
                                      the "plus" catalog) (primgid)
     670-908  A239  ---     groupid   objid's of all sources (AIS) within 2.5",
                                      concatenated by "+" (groupgid)
     910-911  I2    ---     Gd        [-1/1] as for "G" (grank), but based on
                                      distance criterion (grankdist) (1)
     913-914  I2    ---     Nd        [1/12] as for "N" (ngrank), but based on
                                      distance criterion (ngrankdist)
     916-934  I19   ---     primidd   objid of the closest primary, based on distance
                                      criterion (primgiddist)
     936-1174  A239  ---     groupidd  objid's of all sources (AIS) within 2.5",
                                      based on distance criterion (groupgiddist)
     1176-1414  A239  ---     groupTot  objid's of all sources within 2.5"
                                      (groupgidtot)
     1416-1446  A31   ---     OName     Extended object? (if not: "N") (inlargeobj) (2)
     1448-1455  F8.2  pix     Size      [/38740]?=0 Size of the extended object
                                      (largeobjsize) (3)

    Note (1): Code for grank as follows:
      0 = no other sources (from different observations) within 2.5"
      1 = the best (see text) source of >1 sources within 2.5"
     -1 = this is a primary but has a better source within 2.5"
     >1 = this is the nth source within 2.5" of the primary
    Note (2): Type of object is included with the name of the extended object:
              XX:name-of-the-extended-object ; where XX = GA (galaxy),
              GC (globular cluster), OC (open cluster), SC (other stellar clusters).
    Note (3): D25 for galaxies and 2xR1 for stellar clusters.

    Note (4): Negative values have been replaced by blank values by CDS.

    Byte-by-byte Description of file:  table2.dat

       Bytes Format Units   Label     Explanations

       1- 15  A15   ---     ID        Source identifier (1)
      17- 26  F10.6 deg     RAdeg     Right Ascension in decimal degrees (J2000)
      28- 37  F10.6 deg     DEdeg     Declination in decimal degrees (J2000)
      39- 48  F10.6 deg     GLON      Galactic longitude in decimal degrees (J2000)
      50- 59  F10.6 deg     GLAT      Galactic latitude in decimal degrees (J2000)
      61- 65  F5.3  deg     R1        Angular radius of central part of cluster
      67- 69  I3    ---     o_R1      Number of optical cluster stars (most
                                       probable) inside R1
      71- 75  F5.3  deg     R0        Angular radius of core of cluster
      77- 79  I3    ---     o_R0      Number of optical cluster stars (most
                                       probable) inside R0
      81-131  A51   ---     Class     Cluster classification (2)
         133  A1    ---     Bd        Broad type (3)
         135  A1    ---     St        Cluster status (4)
     137-139  A3    ---     Type      Cluster type (5)

    Note (1): Globular clusters listed first, then open clusters, and then
              star clusters. Data and classification from compilation of cluster
              catalogs at  http://heasarc.nasa.gov/W3Browse/all/mwsc.html (MWSC).
              NGC, IC or other common designation, as in MWSC compilation
    Note (2): HEASARC MWSC classification, based on the value of the
              Broad type parameter.
    Note (3): Flag parameter (from http://heasarc.nasa.gov/W3Browse/all/mwsc.html)
              indicating cluster type.
        G = globular cluster;
        O = open cluster ("blank" in the original MWSC compilation);
        M = moving group;
        R = remnant cluster;
        A = association;
        N = nebulosity/presence of nebulosity.
    Note (4): flag parameter set for objects which are not open clusters (from
              https://heasarc.nasa.gov/W3Browse/all/mwsc.html).
        C = candidate;
        O = object.
    Note (5): From MWSC.
        GLO = globular cluster/possible globular cluster;
        IRC = infrared cluster;
        ASS = stellar association;
        REM = Possible cluster remnant;
        EMB = embedded open cluster/cluster associated with nebulosity.

    Byte-by-byte Description of file:  table3.dat

       Bytes Format Units       Label   Explanations

       1- 28  A28   ---         ID      Source identifier
      30- 31  A2    ---         Type    Source type (1)
      33- 42  F10.6 deg         RAdeg   Right Ascension in decimal degrees (J2000)
      44- 53  F10.6 deg         DEdeg   Declination in decimal degrees (J2000)
      55- 64  F10.6 deg         GLON    Galactic longitude
      66- 75  F10.6 deg         GLAT    Galactic latitude
      77- 82  I6    km/s        v3k     Radial velocity (cz) with respect to
                                         CMB radiation (2)
      84- 89  I6    km/s        vlg     Radial velocity (cz) with respect to
                                         Local Group (2)
      91- 98  F8.3  deg         PosAng  Position angle (2)
     100-105  F6.3  deg         Inc     Inclination
     107-112  F6.2  [arcmin]    D25     D25 diameter in units of arcmin
     114-118  F5.2  [arcmin]    e_D25   Uncertainty in D25
     120-126  F7.3  [-]         R25     Axis ratio (major axis / minor axis)
     128-133  F6.3  [-]         e_R25   Uncertainty in R25

    Note (1): Type as follows:
        G = galaxy or quasar;
        Q = QSO;
        ? = Extended source of unknown/uncertain nature;
        M = Multiple galaxy.
    Note (2): A -999 indicates a null value.

    Byte-by-byte Description of file:  table4.dat

       Bytes Format Units   Label     Explanations

       1- 19  A19   ---     ID        Field identifier
      21- 40 F20.16 deg     RAdeg     Center Right Ascension (J2000)
      42- 61 F20.16 deg     DEdeg     Center Declination (J2000)
      63- 82 F20.16 deg     GLON      Center Galactic longitude
      84-103 F20.16 deg     GLAT      Center Galactic latitude
     105-111  F7.3  s       FUVexp    FUV exposure time
     113-120  F8.3  s       NUVexp    NUV exposure time
     122-126  A5    ---     CorV      Observation type (1)

    Note (1): Coadd or Visit.

    Byte-by-byte Description of file:  table5.dat

       Bytes Format Units   Label     Explanations

       1- 19  I19   ---     C-ID      Coadd identifier (1)
      21- 40 F20.16 deg     RAdeg     [1/360.1] Coadd center Right Ascension (J2000)
      42- 61 F20.16 deg     DEdeg     [-89/89] Coadd center Declination  (J2000)
      63- 82 F20.16 deg     C-GLON    Coadd center Galactic longitude
      84-103 F20.16 deg     C-GLAT    Coadd center Galactic latitude
     105-111  F7.3  s       C-FUVexp  Coadd FUV exposure time
     113-119  F7.3  s       C-NUVexp  Coadd NUV exposure time
     121-139  I19   ---     V-ID      Visit identifier
     141-160 F20.16 deg     RAVdeg    Visit center Right Ascension (J2000)
     162-181 F20.16 deg     DEVdeg    Visit center Declination (J2000)
     183-189  F7.3  s       V-FUVexp  Visit FUV exposure time
     191-197  F7.3  s       V-NUVexp  Visit NUV exposure time
     199-204  F6.3  arcmin  Dist      Angular distance between Coadd
                                       and Visit observations
         206  A1    ---     GUVcat    In GUVcat; G=Yes,N=No

    Note (1): The 640 badcoadds were included in BCScat, prior to our discovery of
              the database improper coadding of non-overlapping visits; they are
              not used in GUVcat, and their corresponding visits with both FUV and
              NUV exposure times >0 are used instead (1468 out of 2004 total).

    History:
        Tables 2-5 from electronic version of 2017ApJS..230...24B
        GALEX GR6+7 downloaded from:
        http://dolomiti.pha.jhu.edu/uvsky/GUVcat/GUVcat_AIS.html
         (GUVcatAISfov055: GUVcat_AIS FOV_radius <0.55°)
        20-Nov-2018: Insert into VizieR
        22-May-2019: Column Name added
    ================================================================================
    (End)                    Thomas Boch, Emmanuelle Perret [CDS]        07-Aug-2017