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J/AJ/109/2318                       Extragalactic IRAS sources (Condon+ 1995)
Radio identifications of extragalactic IRAS sources
     Condon J.J., Anderson E., Broderick J.J.
    <Astron. J. 109, 2318 (1995)>
    =1995AJ....109.2318C
ADC_Keywords: Infrared sources ; Radio sources


Abstract:
    Extragalactic sources detected at lambda=60um were selected from the
    IRAS Faint Source Catalog, Version 2 (Cat. II/156) by the criterion
    S(60um)≥S(12um). They were identified by position coincidence with
    radio sources stronger than 25mJy at 4.85GHz in the 6.0sr declination
    band 0deg<Dec.<+75deg (excluding the 0.05sr region 12h40m<R.A.<14h40m,
    0deg<Dec.<+5deg) and with radio sources stronger than 80mJy in 
    the 3.4sr area 0h<R.A.<20h, -40deg<Dec.<0deg (plus the region
    12h40m<R.A.<14h40m, 0deg<Dec.<+5deg). Fields containing new candidate
    identifications were mapped by the VLA at 4.86GHz with about 15" FWHM
    resolution. Difficult cases were confirmed or rejected with the aid of
    accurate (sigma∼1") radio and optical positions. The final sample of
    354 identifications in Omega=9.4sr is reliable and large enough to
    contain statistically useful numbers of radio-loud FIR galaxies and
    quasars. The logarithmic FIR/radio flux ratio parameter q can be used
    to distinguish radio sources powered by "starbursts" from those
    powered by "monsters." Starbursts and normal spiral galaxies in a
    lambda=60um flux-limited sample have a narrow (sigma_q=0.14±0.01) q
    distribution with mean <q≥2.74±0.01, and none have "warm" FIR
    spectra [α(25um, 60um)<1.5]. The absence of radio-quiet (but not
    completely silent) blazars indicates that nearly all blazars become
    optically thin at frequencies ν≲100GHz. Nonthermal sources with
    steep FIR/optical spectra and dust-embedded sources visible only at
    FIR and radio wavelengths must be very rare.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        97      354   Infrared and radio data
table2.dat        96      354   Optical data and derived quantities


See also:
     II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989)
    VIII/14 : 87GB Catalog of radio sources (Gregory et al., 1991)


Byte-by-byte Description of file: table1.dat

   Bytes Format  Units    Label      Explanations

   1- 11  A11    ---      IRAS       IRAS FSC2 name FHHMM.M+DDMM
  13- 14  I2     h        RAh        IRAS FSC2 B1950 right ascension
  16- 17  I2     min      RAm        IRAS FSC2 B1950 right ascension
  19- 22  F4.1   s        RAs        IRAS FSC2 B1950 right ascension
      24  A1     ---      DE-        IRAS FSC2 B1950 Declination sign
  25- 26  I2     deg      DEd        IRAS FSC2 B1950 Declination
  28- 29  I2     arcmin   DEm        IRAS FSC2 B1950 Declination
  31- 32  I2     arcsec   DEs        IRAS FSC2 B1950 Declination
      34  A1     ---      l_S12      [< ] S12 upper limit symbol
  35- 41  F7.3   Jy       S12        IRAS 12 um flux density (1)
      43  A1     ---      l_S25      [< ] S25 upper limit symbol
  44- 50  F7.3   Jy       S25        IRAS 25 um flux density (1)
      52  A1     ---      l_S60      [< ] S60 upper limit symbol
  53- 60  F8.3   Jy       S60        IRAS 60 um flux density (1)
      62  A1     ---      l_S100     [< ] S100 upper limit symbol
  63- 70  F8.3   Jy       S100       IRAS 100 um flux density (1)
  72- 73  I2     h        RA2h       ? Radio B1950 right ascension
  75- 76  I2     min      RA2m       ? Radio B1950 right ascension
  78- 81  F4.1   s        RA2s       ? Radio B1950 right ascension
      83  A1     ---      DE2-       Radio B1950 Declination (sign)
  84- 85  I2     deg      DE2d       ? Radio B1950 Declination
  87- 88  I2     arcmin   DE2m       ? Radio B1950 Declination
  90- 91  I2     arcsec   DE2s       ? Radio B1950 Declination
  92- 97  I6     mJy      S4.85GHz   ? 4.85 GHz flux density (2)

Note (1): Flux densities at 12, 25, 60, and 100um from
          (in descending order of preference)
     the IRAS Catalog of Large Optical Galaxies (Rice et al., Cat. VII/109)
     the revised IRAS Bright Galaxy Sample (Soifer et al. 1989AJ.....98..766S)
     the IRAS Small Scale Structures Catalog (Helou & Walker, Cat. VII/73) and
     the FSC2 itself (Moshir et al., Cat. II/156)
Note (2): 4.85GHz flux density from the 87GB source catalog
     (Gregory & Condon 1991, Cat. VIII/14) or measured from the 87GB 
     or 90GB sky maps, and corrected for strong confusing sources 
     visible in the 4.86GHz VLA maps.


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

   Bytes Format  Units    Label    Explanations

   1- 11  A11    ---      IRAS     IRAS FSC2 name FHHMM.M+DDMM
  13- 25  A13    ---      Name     Common name
  27- 28  I2     h        RAh      ? Optical B1950 right ascension
  30- 31  I2     min      RAm      ? Optical B1950 right ascension
  33- 37  F5.2   s        RAs      ? Optical B1950 right ascension
      39  A1     ---      DE-      Optical B1950 Declination sign
  40- 41  I2     deg      DEd      ? Optical B1950 Declination
  43- 44  I2     arcmin   DEm      ? Optical B1950 Declination
  46- 49  F4.1   arcsec   DEs      ? Optical B1950 Declination
  51- 58  A8     ---      Type     Identification morphology from the UGC
  60- 63  F4.1   mag      mp       ? Apparent photographic magnitude
  65- 70  F6.1   Mpc      Dist     ? Distance assuming Ho=50km/s/Mpc (1)
      72  A1     ---      l_q      [<] Upper limit symbol for q
  73- 77  F5.2   ---      q        Log FIR/radio flux-ratio parameter, 4.85 GHz
  79- 83  F5.2   ---      alp      ? Radio spectral index between 1.4 and 5GHz
      85  A1     ---      l_alpIR  [>] Lower limit symbol for alpIR
  86- 90  F5.2   ---      alpIR    FIR spectral index between 25-60 um
  92- 96  A5     ---      ES       Energy source: S=stars, M=monster

Note (1): Distance from the Revised Shapley-Ames Catalog
     (Sandage & Tammann 1981, Cat. VII/51) or the Hubble distance 
     based on H_0=50km/s/Mpc, q0=1/2.


Origin: AAS CD-ROM series, Volume 5, 1995         Lee Brotzman [ADS] 17-Jul-1995

(End)                                                         [CDS]  23-Oct-1996