Spectroscopic CCD surveys for quasars at large redshift. V. The Palomar Scan Grism Survey catalog

Donald P. Schneider, Maarten Schmidt, J. E. Gunn

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper presents the catalog of objects found in the Palomar Scan Grism Survey (PSGS). The survey consists of eight narrow (≈8′.5 wide) strips of sky; the total effective area is 1.10 deg2. Low-resolution slitless spectra, covering the wavelength range 4400-7500 Å, were obtained for approximately 97,000 objects. The wavelength- and flux-calibrated spectra were searched for emission lines with an automatic software algorithm. A total of 192 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 111 lines (96 different objects). Six groups of emission lines were detected in the survey: Lyα + N V, C IV, C III], Mg II, Hβ + [O III], and Hα + [S II]. Slightly more than half of the confirmed lines are low-redshift (z < 0.45) emission-line galaxies; nine objects are high-redshift quasars (z > 2.7) detected via their Lyα + N V emission lines. Two unusual emission-line objects were found as part of the survey; one is a late-type star (M9.5) with very strong Balmer emission, the other is an unresolved source with numerous broad emission lines and a strong absorption line.

Original languageEnglish (US)
Pages (from-to)40-55
Number of pages16
JournalAstronomical Journal
Volume117
Issue number1
DOIs
StatePublished - Jan 1 1999

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quasars
catalogs
charge coupled devices
wavelength
wavelengths
signal-to-noise ratio
slits
sky
strip
coverings
signal to noise ratios
spectroscopy
computer programs
software
stars

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Spectroscopic CCD surveys for quasars at large redshift. V. The Palomar Scan Grism Survey catalog",
abstract = "This paper presents the catalog of objects found in the Palomar Scan Grism Survey (PSGS). The survey consists of eight narrow (≈8′.5 wide) strips of sky; the total effective area is 1.10 deg2. Low-resolution slitless spectra, covering the wavelength range 4400-7500 {\AA}, were obtained for approximately 97,000 objects. The wavelength- and flux-calibrated spectra were searched for emission lines with an automatic software algorithm. A total of 192 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 111 lines (96 different objects). Six groups of emission lines were detected in the survey: Lyα + N V, C IV, C III], Mg II, Hβ + [O III], and Hα + [S II]. Slightly more than half of the confirmed lines are low-redshift (z < 0.45) emission-line galaxies; nine objects are high-redshift quasars (z > 2.7) detected via their Lyα + N V emission lines. Two unusual emission-line objects were found as part of the survey; one is a late-type star (M9.5) with very strong Balmer emission, the other is an unresolved source with numerous broad emission lines and a strong absorption line.",
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Spectroscopic CCD surveys for quasars at large redshift. V. The Palomar Scan Grism Survey catalog. / Schneider, Donald P.; Schmidt, Maarten; Gunn, J. E.

In: Astronomical Journal, Vol. 117, No. 1, 01.01.1999, p. 40-55.

Research output: Contribution to journalArticle

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AB - This paper presents the catalog of objects found in the Palomar Scan Grism Survey (PSGS). The survey consists of eight narrow (≈8′.5 wide) strips of sky; the total effective area is 1.10 deg2. Low-resolution slitless spectra, covering the wavelength range 4400-7500 Å, were obtained for approximately 97,000 objects. The wavelength- and flux-calibrated spectra were searched for emission lines with an automatic software algorithm. A total of 192 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 111 lines (96 different objects). Six groups of emission lines were detected in the survey: Lyα + N V, C IV, C III], Mg II, Hβ + [O III], and Hα + [S II]. Slightly more than half of the confirmed lines are low-redshift (z < 0.45) emission-line galaxies; nine objects are high-redshift quasars (z > 2.7) detected via their Lyα + N V emission lines. Two unusual emission-line objects were found as part of the survey; one is a late-type star (M9.5) with very strong Balmer emission, the other is an unresolved source with numerous broad emission lines and a strong absorption line.

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