J/AJ/107/1245 QSOs Palomar Transit Grism Survey catalog (Schneider+ 1994)
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 1994AJ....107.1245S (SIMBAD/NED BibCode)
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 61.47deg2. 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.
See also:
1986ApJ...306..411S 1986ApJ...306..411S Schmidt M., Schneider D.P., Gunn J.E. (Paper I)
1986ApJ...310..518S 1986ApJ...310..518S Schmidt M., Schneider D.P., Gunn J.E. (Paper II)
1995AJ....110...68S 1995AJ....110...68S Schmidt M., Schneider D.P., Gunn J.E. (Paper IV)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5 67 1052 Transit grism line detections
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Byte-by-byte Description of file: table5
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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 r4 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.
(End) James Marcout, Patricia Bauer [CDS] 13-Feb-1997