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J/AJ/107/1245       QSOs Palomar Transit Grism Survey catalog (Schneider+ 1994)
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Spectroscopic CCD surveys for quasars at large redshift. III. The Palomar
Transit Grism Survey catalog.
      Schneider D.P., Schmidt M., Gunn J.E.
     <Astron. J. 107, 1245 (1994)>
     =1994AJ....107.1245S      (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Redshifts

Abstract:
    This paper reports the initial results of the Palomar Transit Grism
    Survey (PTGS). The PTGS was designed to produce a sample of z>2.7
    quasars that were identified by well-defined selection criteria. The
    survey consists of six narrow (~8.5' wide) strips of sky; the total
    effective area is 61.47deg^2^. Low-resolution slitless spectra,
    covering the wavelength range from 4400 to 7500A, were obtained for
    approximately 600000 objects. The wavelength- and flux-calibrated
    spectra were searched for emission lines with an automatic software
    algorithm. A total to 1655 emission features in the grism data
    satisfied our signal-to-noise ratio and equivalent width selection
    criteria; subsequent slit spectroscopy of the candidates confirmed the
    existence of 1052 lines (928 different objects). Six groups of
    emission lines were detected in the survey: Lyman alpha+N V, C IV,
    C III], Mg II, Hbeta+[O III], and Halpha+[S II]. More than two-thirds
    of the candidates are low-redshift (z<0.45) emission-line galaxies;
    ninety objects are high-redshift quasars (z>2.7) detected via their
    Lyman alpha+N V emission lines. The survey contains three previously
    unknown quasars brighter than 17th magnitude; all three have redshifts
    of ~1.3. In this paper we present the observational properties of the
    survey, the algorithms used to select the emission-line candidates,
    and the catalog of emission-line objects.


File Summary:
--------------------------------------------------------------------------------
  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table5.dat         67     1052   Transit grism line detections
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See also:
    1986ApJ...306..411S : Schmidt M., Schneider D.P., Gunn J.E. (Paper I)
    1986ApJ...310..518S : Schmidt M., Schneider D.P., Gunn J.E. (Paper II)
    1995AJ....110...68S : Schmidt M., Schneider D.P., Gunn J.E. (Paper IV)

Byte-by-byte Description of file: table5.dat
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   Bytes Format Units   Label   Explanations
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   1- 10  A10   ---     PTGS  Name with multiplicity index (1)
  12- 13  I2    h       RAh   Right ascension (1950)
  15- 16  I2    min     RAm   Right ascension (1950)
  18- 21  F4.1  s       RAs   Right ascension (1950)
      23  A1    ---     DE-   Declination sign
  24- 25  I2    deg     DEd   Declination (1950)
  27- 28  I2    arcmin  DEm   Declination (1950)
  30- 31  I2    arcsec  DEs   Declination (1950)
  33- 37  F5.2  mag     r4    r_4_ magnitude calculated from the slit spectrum
  39- 43  F5.3  ---     z     Source redshift based on measurements of the
                                slit spectrum
  45- 49  F5.2  mW/m2  -logF  Negative logarithm of the detected emission
                                line flux
  51- 54  I4    0.1nm   EW    Observed equivalent width of the emission feature
                                ID measured in the slit spectrum (2)
  56- 61  F6.2  ---     SN    Signal-to-noise ratio of the emission line in
                                the grism spectrum
  63- 65  I3    0.1nm   W0    Intrinsic observed line width measured from the
                                slit spectrum for ID line
      67  I1    ---     ID    Identification code for line (3)
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Note (1): The object name is formed by taking the first digits
     of the 1950 right ascension and declination; when this nomenclature
     fails to uniquely define an object, a suffix A, B or C is attached.
Note (2): The quoted values for Lyman alpha + N V (ID=1)
     and Hbeta + [O III] (ID=5) lines refer to the total equivalent
     width of the blend.
     A value of 1000 indicates that the continuum in the grism spectrum
     is negative.
Note (3):  Code for line identifications:
     1 - Lyman alpha + N V
     2 - C IV
     3 - C [III]
     4 - Mg II
     5 - Hbeta + [O III]
     6 - Halpha+[S II]
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History: Prepared via OCR at CDS.
     Corrected in February 1997 with a file that was supplied by
     Don P. Schneider to Heinz Andernach in April 1994.
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(End)                           James Marcout, Patricia Bauer [CDS]  13-Feb-1997