The Palomar Transit GRISM Survey

Details The Palomar Transit GRISM Survey The Palomar Transit GRISM Survey

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.7203s&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #72.03; Bulletin of the American Astronomical Society, Vol. 25, p.1402

Astronomy and Astrophysics

Astronomy

Scientific paper

The Palomar Transit Grism Survey, a program designed to produce a sample of z > 2.7 quasars identified by well-defined selection criteria, has recently been completed. The survey consists of six narrow (~ 8.5' wide) strips of sky; the total effective area is 61.47 sq deg. Low-resolution slitless spectra, covering the wavelength range from 4400 Angstroms to 7500 Angstroms, were obtained with the 4-Shooter CCD camera for approximately 600,000 objects. The wavelength- and flux-calibrated spectra were searched for emission lines with an automatic software algorithm. A total of 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, Hβ +[O III], and Hα +[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 17() th magnitude; all three have redshifts of ~ 1.3.

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