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J/MNRAS/352/1245    Faint 1.4GHz radio sources in 2dFGRS     (Chan+, 2004)
Faint 1.4-GHz radio sources in the 2dF Galaxy Redshift Survey.
    Chan B.H.P., Cram L.E., Sadler E.M., Killeen N.E.B., Jackson C.A.,
    Mobasher B., Ekers R.D.
   <Mon. Not. R. Astron. Soc., 352, 1245-1254 (2004)>
   =2004MNRAS.352.1245C
ADC_Keywords: Radio sources ; Redshifts

Keywords: surveys - galaxies: distances and redshifts - galaxies: evolution -
          galaxies: fundamental parameters - galaxies: statistics -
          radio continuum: galaxies

Abstract:
    We have used the Australia Telescope Compact Array (ATCA) to search
    for faint radio sources in a ∼3deg2 region of sky covered by the
    2dF Galaxy Redshift Survey (2dFGRS, Cat. VII/226). Over the region
    surveyed, the 1σ noise level at 1.4GHz ranges from 20Jy to 1mJy.
    The survey region includes 365 2dFGRS galaxies, of which 316 have
    good-quality spectra (176 early-type galaxies or active galactic
    nuclei, and 140 star-forming galaxies). The fraction of 2dFGRS
    galaxies detected as radio sources in our survey rises from ∼4% at a
    3σ detection limit of 0.3mJy to 12% at 75µJy, with roughly
    equal numbers of star-forming galaxies and active galactic nuclei
    (AGNs) being detected.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       124       34   2dFGRS radio identifications
table4.dat        62      331   2dFGRS radio upper limits


See also:
  VII/226 : The 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       2dFGRS right ascension (J2000)
   4-  5  I2    min     RAm       2dFGRS right ascension (J2000)
   7- 11  F5.2  s       RAs       2dFGRS right ascension (J2000)
      13  A1    ---     DE-       2dFGRS declination sign (J2000)
  14- 15  I2    deg     DEd       2dFGRS declination (J2000)
  17- 18  I2    arcmin  DEm       2dFGRS declination (J2000)
  20- 23  F4.1  arcsec  DEs       2dFGRS declination (J2000)
  25- 34  A10   ---     2dFGRS    2dFGRS (VII/226) name
  36- 41  F6.4  ---     z         2dFGRS Redshift
  43- 47  F5.2  mag     Bjmag     Final Bj magnitude used in 2dFGRS
      49  I1    ---     q_z       [1/5] 2dFGRS redshift measurement quality (G1)
  51- 54  A4    ---     Class     Visual spectral classification (G2)
      56  I1    ---     FM        [1/3] Fitting method used to derive the radio
                                         flux density (1)
  58- 59  I2    h       RAVh      ? VSAD-5σ radio right ascension (J2000)
  61- 62  I2    min     RAVm      ? VSAD-5σ radio right ascension (J2000)
  64- 68  F5.2  s       RAVs      ? VSAD-5σ radio right ascension (J2000)
      70  A1    ---     DEV-      VSAD-5σ radio declination sign (J2000)
  71- 72  I2    deg     DEVd      ? VSAD-5σ radio declination (J2000)
  74- 75  I2    arcmin  DEVm      ? VSAD-5σ radio declination (J2000)
  77- 80  F4.1  arcsec  DEVs      ? VSAD-5σ radio declination (J2000)
  82- 84  F3.1  arcsec  Delta     ? Estimated VSAD fitted positional uncertainty
  86- 90  F5.3  arcsec  Sep       ? Radio-optical angular separation
  92- 97  F6.3  mJy     Speak     ? Peak 1.4GHz radio flux density (2)
  99-104  F6.3  mJy     Stot      ? Integrated 1.4GHz radio flux density (2)
 106-107  I2    %       e_S       Percentage radio flux uncertainty (3)
 109-113  F5.3  mJy     e_Speak   Actual radio flux uncertainty (3)
 115-120  F6.4  mJy     sigma-n   Estimated local noise
 122-124  I3    ---     S/N       Signal-to-noise ratio (Speak/σn)

Note (1): The fitting method used to derive the radio flux density:
      1 = VSAD≥ 5σ match;
      2 = IMFIT≥ 3σ match, and
      3 = pixel summation.
Note (2): Determined using the corresponding fitting method

Note (3): When the local noise exceeds the fitting uncertainty, the
          larger value was used


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       2dFGRS right ascension (J2000)
   4-  5  I2    min     RAm       2dFGRS right ascension (J2000)
   7- 11  F5.2  s       RAs       2dFGRS right ascension (J2000)
      13  A1    ---     DE-       2dFGRS declination sign (J2000)
  14- 15  I2    deg     DEd       2dFGRS declination (J2000)
  17- 18  I2    arcmin  DEm       2dFGRS declination (J2000)
  20- 23  F4.1  arcsec  DEs       2dFGRS declination (J2000)
  25- 34  A10   ---     2dFGRS    2dFGRS (VII/226) name
      35  A1    ---     n_2dFGRS  [a] upper limit (1)
  37- 42  F6.4  ---     z         ? 2dFGRS Redshift
  44- 48  F5.2  mag     Bjmag     Final Bj magnitude used in 2dFGRS
      50  I1    ---     q_z       [1/5] 2dFGRS redshift measurement quality (G1)
  52- 55  A4    ---     Class     Visual spectral classification (G2)
  58- 62  F5.3  mJy     UL        3σ upper limit

Note (1): 'a' indicates a radio upper limit represented by the average
          of the nearest four pixels to the 2dFGRS position


Global notes:

Note (G1): The 2dFGRS redshift quality (Q) ranges from '1' for unlikely/poor
           quality spectra to '5' indicating a secure redshift
Note (G2): Visual spectral classification use the following abbreviations:
     abs = absorption-line spectrum
      em = emission-line spectrum with dominant forbidden lines (e.g. [OIII])
     a+e = combined absorption- and emission-line spectrum
      SF = emission-line spectrum with dominant recombination lines
           (e.g. Hα)
     ??? = spectrum with inadequate signal-to-noise ratio (S/N) or
           otherwise unclassifiable


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    28-Feb-2005