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J/MNRAS/253/686          Survey of faint compact objects        (Colless+, 1991)
A spectroscopic survey of faint compact objects
         COLLESS M., ELLIS R.S., TAYLOR K., SHAW G.
         <Mon. Not. R. Astron. Soc. 253, 686 (1991)>
         =1991MNRAS.253..686C
ADC_Keywords: Surveys; Spectroscopy; Positional data; Colors; Spectral types


Abstract:
   We present results from a low-resolution (73A) spectroscopic survey of
   faint compact objects conducted with the Low Dispersion Survey Spectrograph
   at the Anglo-Australian Telescope. The sample is a random subset of all
   compact sources with 22.5≤bj≤23.5 in three high-latitude fields.
   Additional data on compact sources with 21≤bj≤22.5 have been selected
   from the higher resolution (13A) survey previously published by Colless
   et al. (1990), and a subset of these brighter objects has been studied
   at both dispersions.

Table 1: Summary of the photographic photometry.
------------------------------------------------------------------------
  Field Band    AAT     Seeing  Isophote     Survey range
                plates  arcsec  mag/arcsec2  mag
------------------------------------------------------------------------
  10hr  bj      J1834   1.7     26.44        20.98<bJ<23.48
        rF      F1835   1.8     24.61
        U       U2206   2.0     25.09
  13hr  bj      J1836   1.8     26.52        20.94<bJ<23.44
        rF      F1837   2.3     24.82       (20.00<bJ<23.60 in zone 13.1)
        U       U2208   2.3     24.88

Table 2: The survey observations
------------------------------------------------------------------------
  Survey   alpha     delta        Obsvn    Detector Exposure Area
   zone        (1950)              dates            time(s)  deg2
------------------------------------------------------------------------
  10.2    10 43 55.4 +00 05 33    18/3/88  IPCS     15000    0.0330
  10.4    10 43 51.4 -00 06 41    20/3/88  IPCS     13500    0.0330
  13.1    13 40 32.0 +00 13 22   1-2/6/86  CCD      14500    0.0078
  13.2    13 41 57.3 +00 06 25    18/3/88  IPCS     12000    0.0330

Table 5: Total bj surface density
------------------------------------------------------------------------
                            bj-rF
 Field 0.25  0.50 0.75 1.00 1.25 1.50 1.75  2.00 2.25 2.50 Total
------------------------------------------------------------------------
  a       0     0    0    0   74   89    0  296  612  210  1281
  b      44     0  105  317  270  224   91  357  702  241  2351
  c       0    92  188  278   49  188   98  379  572  196  2040
  d      46   190  382  564  147  188  147  379  572  196  2811

Table7: Colour distribution of unknown compact sources
------------------------------------------------------------------------
                  Numbers (deg-2)
 bj-rF   21≤bj≤22.5   22.5≤bJ≤23.5
------------------------------------------------------------------------
 <0.25             -                 -
 0.25-0.50         71                19
 0.50-0.75         82                56
 0.75-1.00         94               150
 1.00-1.25         82               224
 1.25-1.50        118                37
 1.50-1.75         -                 56
 1.75-2.00         -                 56
 2.00-2.25         35                56
 2.25-2.50         -                 56
 2.50-2.75         -                 38
 2.75-3.00         -                 19
     >3.00         -                  -
 No colour         71                94

 Total unknown    552               804
 Total compact   1333              1560
   All objects   5620             10427

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3           104      117   The survey catalogue
table5            51       20   Surface densities of spectroscopically
                                  confirmed stars (STARS) and objects not
                                  identified as galaxies (NONGAL)


Byte-by-byte Description of file: table3

   Bytes Format  Units   Label    Explanations

   1-  7  A7     ---     Id       Identification number
   9- 10  I2     h       RAh      Right ascension 1950.0
  12- 13  I2     min     RAm      Right ascension 1950.0
  15- 19  F5.2   s       RAs      Right ascension 1950.0
      25  A1     ---     DE-      Declination sign
  26- 27  I2     deg     DEd      Declination 1950.0
  29- 30  I2     arcmin  DEm      Declination 1950.0
  32- 35  F4.1   arcsec  DEs      Declination 1950.0
  41- 45  F5.2   mag     bj       bj magnitude
  49- 52  F4.2   mag     bj-rF    []? bj-rF colour index
  55- 59  F5.2   mag     U-bj     []? U-bj colour index
  63- 67  F5.3   ---     z        []? Redshift
  73- 77  A5     ---     SID      Spectral identification (1)
  80-104  A25    ---     com      Comments

Note (1): star: stars of spectral type earlier than M
           qso: QSO
           elg: emission line galaxies with two or more identified lines
           gal: galaxies showing the Ca H+K break at 4000A
           em?: spectra showing one or more unidentified emission feature
           ???: unidentifiable spectra


Byte-by-byte Description of file: table5

   Bytes Format  Units   Label    Explanations

       1  A1     ---     Field    Field designation (1)
   3-  7  F5.2   mag     bj       bj magnitude of the objects
   9- 10  I2     deg-2   S0.25    Distribution for objects with bj-rf=0.25
  12- 14  I3     deg-2   S0.50    Distribution for objects with bj-rf=0.50
  16- 18  I3     deg-2   S0.75    Distribution for objects with bj-rf=0.75
  20- 22  I3     deg-2   S1.00    Distribution for objects with bj-rf=1.00
  24- 26  I3     deg-2   S1.25    Distribution for objects with bj-rf=1.25
  28- 30  I3     deg-2   S1.50    Distribution for objects with bj-rf=1.50
  32- 34  I3     deg-2   S1.75    Distribution for objects with bj-rf=1.75
  36- 38  I3     deg-2   S2.00    Distribution for objects with bj-rf=2.00
  40- 42  I3     deg-2   S2.25    Distribution for objects with bj-rf=2.25
  44- 46  I3     deg-2   S2.50    Distribution for objects with bj-rf=2.50
  48- 51  I4     deg-2   Stot     Total distribution

Note (1): a: 10hr field STARS
          b: 10hr field NONGAL
          c: 13hr field STARS
          d: 13hr field NONGAL


References:
   Colless M.M. et al., 1990, MNRAS, 244, 408

Historical note: Keypunched at CDS

(End)                            James Marcout, Patricia Bauer [CDS] 26-Jan-1995