ACDS V10.0 - Detailed Description of VII/113

ACDS V10.0 - Sun Jan 19 02:25:37 CET 2025

| # Detailed Description of VII/113 : Catalogued Galaxies + QSOs observed in IRAS Survey, Vers.2 (IPAC 1989) |

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/113   Catalogued Galaxies + QSOs observed in IRAS Survey, Vers.2 (IPAC 1989)
    ================================================================================
    Catalogued Galaxies and Quasars observed in the IRAS Survey, Version 2
         Fullmer L., Londsale C.J., IPAC, 1989
        <JPL D-1932, Version 2, 1989 February>
        =1989IRASG....c....F
    ================================================================================
    ADC_Keywords: Infrared sources ; Galaxy catalogs ; QSOs

    Mission_Name: IRAS

    Description (from the Introduction of the catalog):
        The Infrared Astronomical Satellite (IRAS) surveyed approximately
        96% of the sky in four infrared wavelength bands centered at 12,
        25, 60, and 100 um. The IRAS data are presented in catalogs of
        point sources and small extended sources (<8') as well as in
        atlases of low resolution spectra and sky-brightness images. The
        Cataloged Galaxies and Quasars Observed in the IRAS Survey,
        hereafter referred to as the "Extragalactic Catalog", is the
        subset of those point source data pertaining to previously known
        galaxies and quasars. It is intended as a readily accessible
        compilation of IRAS data for objects appearing in the most
        widely-used extragalactic catalogs.

        The Extragalactic Catalog contains 11,444 IRAS point sources
        (IRAS Point Source Catalog, Version 2.0) that can be positionally
        associated with catalogued galaxies and quasars, including
        association information of point sources with sources from the
        IRAS Small Scale Structure Catalog. Section II summarizes
        important aspects of the IRAS mission and the data processing
        techniques. Section III describes the organisation of the
        Extragalactic Catalog and the way in which the associations were
        made with the various galaxy catalogs. Section IV describes the
        information given for each entry in the Extragalactic Catalog.
        Section V presents some preliminary statistics on the contents of
        the Extragalactic Catalog. Acknowledgments and References are
        given in Sections VI and VII. The catalog itself comprises Section
        VIII. Some notes and errata are given in Sections IX and X. A
        printed and a tape version of the Extragalactic Catalog are
        available.

    Notice:
        This file is NOT a complete scientific document for the catalogue;
        it serves only as a minimal description of the general format and
        structure of the data files. A copy of "Cataloged Galaxies and
        Quasars Observed in the IRAS Survey, 2" should be used to answer
        questions about the data in the IRAS Extragalactic Catalog.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × intro.txt         83      675   Excerpt from the published documentation
    × xcat.dat         134    11444   Point source data
    × assoc.dat        137    12776   Association Data for Extragalactic Catalog

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

       Bytes Format  Units   Label    Explanations

       1- 11  A11    ---     IRAS     Source name
      12- 13  I2     h       RAh      Hours RA, equinox 1950.0, epoch 1983.5
      15- 16  I2     min     RAm      Minutes RA, equinox 1950.0, epoch 1983.5
      18- 21  F4.1   s       RAs      Seconds RA, equinox 1950.0, epoch 1983.5
          23  A1     ---     DE-      Sign of DEC, equinox 1950.0, epoch 1983.5
      24- 25  I2     deg     DEd      Degrees Dec, equinox 1950.0, epoch 1983.5
      27- 28  I2     arcmin  DEm      Minutes Dec, equinox 1950.0, epoch 1983.5
      30- 31  I2     arcsec  DEs      Seconds Dec, equinox 1950.0, epoch 1983.5
      33- 35  I3     deg     GLAT     Galactic latitude
      37- 39  I3     arcsec UncMajor  Uncertainty ellipse semi-major axis
      40- 42  I3     arcsec UncMinor  Uncertainty ellipse semi-minor axis
      44- 46  I3     deg     PosAng   Uncertainty ellipse position angle measured
                                        East of North between the major axis of the
                                        ellipse and the local equatorial meridian.
      47- 48  I2     ---     NHcon    Number of times observed
      49- 54  F6.2   Jy      Fnu_12   Non-color corrected flux density at 12um
          55  A1     ---    FQual_12  [:L] Flux quality at 12um (1)
      56- 61  F6.2   Jy      Fnu_25   Non-color corrected flux density at 25um
          62  A1     ---    FQual_25  [:L] Flux quality at 25um (1)
      63- 69  F7.2   Jy      Fnu_60   Non-color corrected flux density at 60um
          70  A1     ---    FQual_60  [:L] Flux quality at 60um (1)
      71- 77  F7.2   Jy      Fnu_100  Non-color corrected flux density at 100um
          78  A1     ---   FQual_100  [:L] Flux quality at 100um (1)
      79- 84  F6.2   [W/m2] log(FIR)  Decimal log of far infrared flux (4)
          85  A1     ---     FQFIR    [:L] FIR flux quality (1)
          86  A1     ---   Relunc_12  [A-F] Flux density uncertainty at 12um (2)
          87  A1     ---   Relunc_25  [A-F] Flux density uncertainty at 25um (2)
          88  A1     ---   Relunc_60  [A-F] Flux density uncertainty at 60um (2)
          89  A1     ---  Relunc_100  [A-F] Flux density uncertainty at 100um (2)
          91  A1     ---     CC_12    [A-N] Point source corr. coeff, 12um (3)
          92  A1     ---     CC_25    [A-N] Point source corr. coeff, 25um (3)
          93  A1     ---     CC_60    [A-N] Point source corr. coeff, 25um (3)
          94  A1     ---     CC_100   [A-N] Point source corr. coeff, 100um (3)
          96  I1     ---     Cirr1    Number of nearby 100 micron only sources
          97  I1     ---     Cirr2    Ratio of cirrus flux to source flux
          99  A1     ---     Confuse  [0-9A-F] Confusion flag, hex encoded (5)
         100  I1     ---     PNearH   Number hours-confirmed point sources nearby
                                         If it exceeds 9, it is set equal to 9.
         101  I1     ---     PNearW   Number weeks-confirmed point sources nearby
                                        If it exceeds 9, it is set equal to 9.
         102  A1     ---     HSDFlag  [0-9A-F] High source density bin flag,
                                        hex encoded (5)
         104  I1     ---     SES1_12  Number of seconds-confirmed 12um SES
                                        (Small Extended Sources) nearby
         105  I1     ---     SES1_25  Number of seconds-confirmed 25um SES nearby
         106  I1     ---     SES1_60  Number of seconds-confirmed 60um SES nearby
         107  I1     ---    SES1_100  Number of seconds-confirmed 100um SES nearby
         108  A1     ---     SES2     [0-9A-F] Number of weeks-confirmed SES nearby
                                        hex encoded (5)
     109-110  I2     ---     NSSS     ? Number of associations from SSS
                                        (Small Scale Structure) catalog
     112-121  A10    ---     SSSName  Name of closest SSS association
     122-124  I3     arcsec  DisSSS   ? Separation from the SSS source
     125-126  I2     ---     NonGal   ? Number of associations from non-galaxy
                                        catalogs
         128  A1     ---     IdnGal   [1-9A-J] Closest non-galaxy catalog
                                        association (6)
     130-132  I3     arcsec  DSNGal   ? Separation of the non-galaxy source
     133-134  I2     ---     NRecs    Number of lines in "assoc" file with IRAS name

    Note (1): Flux quality codes are
        (blank) = high quality;
            ':' = moderate quality;
            'L' = upper limit
    Note (2): Uncertainties of FIR are coded as follows:
             A  = from  0 to less than  4%
             B  = from  4 to less than  8
             C  = from  8 to less than 12
             D  = from 12 to less than 16
             E  = from 16 to less than 20
             F  = equal to or greater than 20%
    Note (3): Correlation Coefficient codes are:
            A = 100%, B = 99%, C = 98%, ...,
            M =  88%, N = 87%
    Note (4): FIR estimates the flux that would have been measured within
            an ideal square bandpass 42.5-122.5um; it is a combination of
            60 and 100 micron fluxes. See Appendix B, printed edition.
    Note (5): Hex encoded flags compose the flags of the 4 passbands
            with masks 1=12um, 2=25um, 4=60um, 8=100um.
            See Table IV.A.1., printed edition.
    Note (6): Codes for non-galaxy id's are in Table IV.A.2., printed edition.
        Very  brief summary:
        ------------------------------------------------------------------------
        1 = SAO                          A = PN (Planetary Nebulae)
        2 = HR (Bright Star)             B = Parkes HII Survey
        3 = DO (Dearborn Red *)          C = Bonn HII Survey
        4 = GCVS (Variable name)         D = CO Velocities Toward HII Regions
        5 = Wackerling (emission *)      E = LDN (Lynds Dark Nebulae)
        6 = NSV (Supsected Variables)    F = AFGL (Air Force Geophys. Lab.)
        7 = CCCS (Cool C*)               G = IRC (2-um Sky Survey)
        8 = Gliese (nearby *)            H = EIC (Equatorial IR Catalogue)
        9 = CSS (S*)                     I = IRC improved (Kleinmann+Joyce 1984)
                                         J = 1Jy (extragalactic sources)
        ------------------------------------------------------------------------

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

       Bytes Format  Units   Label            Explanations

       1- 11  A11    ---     IRAS             IRAS source name
      12- 23  A12    ---     PGCName          Galaxy name from Primary Galaxy Catalog
                                        (UGC, UGCA, ESO, and CGCG)
          25  I1     ---     NPGC             ? Number of appearances of PGCName in file
      26- 30  I5     arcsec  DiamP            ? Major axis diameter
      33- 35  I3     arcsec  DisPGC           ? Distance from IRAS source
      37- 39  I3     deg     paPGC            [0/360]? Position angle of separation vector
                                        measured in degrees East of North
          41  A1     ---     PosFlg           [B-Z] Position flag (1)
          42  A1     ---     MagFlg           [B-Z] Magnitude flag (1)
      44- 47  F4.1   mag     MagPGC           ? Magnitude from Primary Galaxy Catalog
      49- 55  A7     ---     Class            Classification
      57- 67  A11    ---     MCG              Morphological Catalog of Galaxies (MCG) number
          69  I1     ---     NMCG             ? Number of appearances of MCG in file
      71- 74  I4     arcsec  DiamMCG          ? Major axis diameter
      76- 78  I3     arcsec  DisMCG           ? Distance from IRAS source
                                        measured in degrees East of North
      80- 82  I3     deg     paMCG            [0/360]? Position angle of separation vector
      84- 90  A7     ---     NGCIC            NGC or IC identification of Primary Catalog
                                        or MCG galaxy
      91- 97  A7     ---     AMDName          ARP, MKN, DDO associations
          99  I1     ---     NAMD             ? Number of appearances of AMDName in file
     101-103  I3     arcsec  DisAMD           ? Distance from IRAS source
     105-107  I3     deg     paAMD            [0/360]? Position angle of separation vector
                                        measured in degrees East of North
     109-119  A11    ---     VVZName          VCV (Veron-Cetty and Veron 1984),
                                      VV Verontsov-Velyaminov (Interact. Gal.),
                                      and Zwicky list associations
         121  I1     ---     NVVZ             ? Number of appearances of VVZName in file
     123-125  I3     arcsec  DisVVZ           ? Distance from IRAS source
     127-129  I3     deg     paVVZ            [0/360]? Position angle of separation vector
                                        measured in degrees East of North
     131-132  A2     ---     VCVFlg           VCV identifier or VV flag (2)
     133-137  I5     ---     RecNo            [1/11444]+= Main Data Table record number
                                        for IRAS source

    Note (1): The position and Magnitude flags are described in Section IX.A
        of the printed edition:
        B = The right ascension was changed to agree with the printed entry,
            or with a printed remark.
        C = The declination was changed to agree with the printed catalog.
        D = The position comes from the compilation of Dressel and Condon (1976).
        F = The right ascension was changed to agree with the conversion of
            printed galactic coordinates.
        G = The declination was changed to agree with the conversion of
            printed galactic coordinates.
        H = The magnitude was changed to agree with the printed version.
        K = The UGC and CGCG positions disagree, though the magnitudes agree.
            A combination of inspections of sky survey plates, UGC hardcopy notes,
            and cross-references using NGC or IC identifications resulted in the
            verification that the UGC and CGCG names refer to the same object.
            The UGC position has been adopted.
        L = As for K, but a better position than that given in either the UGC
            or CGCG was derived using a sky survey overlay, because neither of
            the catalogued positions was adequate. This new position should be
            accurate to about 1'.
        M = No CGCG object could be found that matched this UGC galaxy in
            position, although the UGC magnitude is not greater than 15.7.
            One possible explanation is that the galaxy is contained in
            one of the Zwicky lists of Selected Compact and Post-Eruptive
            Galaxies instead of the CGCG.
        N = A UGC and a CGCG galaxy are found with identical positions but
            the magnitudes disagree. The CGCG magnitude is brighter than the UGC
            magnitude by more than 1 magnitude. The UGC magnitude is quoted.
        P = As for N, except that the magnitudes disagree by less than 1
            magnitude. The UGC magnitude is given.
        Q = The UGC and CGCG positions are identical, but the magnitudes
            disagree because the CGCG magnitude applies to individual members of
            a pair or group of galaxies, while the UGC magnitude applies to more
            than one of the members. The UGC magnitude is the one quoted.
        R = The UGC carries no magnitude so the CGCG magnitude is given.
        S = As for N, but the UGC magnitude is more than 1 magnitude brighter
            than the CGCG magnitude. The UGC magnitude is given.
        T = Similar case to Q except that the UGC and CGCG roles are reversed.
            The UGC magnitude is given.
        W = The magnitude listed here for each of the components of a galaxy
            group is the magnitude given the entire galaxy or galaxy group
            by the UGC.
        X = Combination of W and P.
        Z = The position was changed to agree with the CGCG position because
            the UGC position was found to be in error.
    Note (2): The flags relative to VV and VCV catalogues are described
        in Section IX.B of the printed edition:
        A = V10 has the same coordinates as V29 in the Atlas. The UGC name
            was used to confirm that the coordinate is correct for V29 and
            erroneous for V10. The UGC position for V10 = UGC 10814 was adopted.
        B = The V position is substantially different (>400") from positions
            for the object in other catalogs. The V position has been assumed
            to be in error because two or more other catalogs agree on a
            different position. The UGC position has been adopted.
        C = Same as for B, but the position from the Master List of Non-Stellar
            Sources (Dixon and Sonneborn 1980; the ML) has been adopted.
        D = The V position differs from that of the ML for the object.
            By use of overlays with the sky surveys, it has been established
            that the V position is in error so the ML position has been adopted.
        E = Same as for D, except that the ML position is not adequate either
            so a new position has been derived from the overlay which is
            accurate to about 1'.
        S1 = Seyfert type 1 galaxy.
        S2 = Seyfert type 2 galaxy.
        S3 = Seyfert type 3 galaxy, or "Liner".
        S or S? = Probably or possibly a Seyfert.
        H2 = Galaxy dominated by nuclear HII-regions, or "Starburst" nucleus.
        BL = BL Lac object.
        AN = "Active Nucleus". This flag is used when Veron-Cetty and Veron
            show no type for the object.

    Historical Notes:
      * From the "Selected Astronomical Catalogs" Vol. 1 CD-ROM (1992)
        directory          nonstell/galaxies/irasgal
      * 10-Jan-1995: set to blank the column 103 of file "xcat" which contained
        the values 0, 1 or 2 (identical to the tens of RAh) for the records:
        # 1847 = IRAS 03216+7240
        # 1952 = IRAS 03354+6633
        # 2018 = IRAS 03434+6757
        # 3437 = IRAS 07193+2211
        # 4261 = IRAS 09065+5015
        # 4325 = IRAS 09133+7431
        # 5827 = IRAS 11463-6929
        # 6278 = IRAS 12234+1315
        # 7150 = IRAS 13317-4517
        # 9810 = IRAS 19184-7404
        #10378 = IRAS 21021+0927
        #11367 = IRAS 23448+0139
        The explanations of the flags PosFlg, MagFlg and VCVFlg have been added.
      * 04-Dec-2002: Corrected the units of DisSSS and DSNGal which are
        arcsec's, not arcmin's ! (thanks to Sally Hales, MRAO Cambridge)
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    07-Jan-1995