Spectroscopy of neutral-colored QSO candidates

Details Spectroscopy of neutral-colored QSO candidates Spectroscopy of neutral-colored QSO candidates

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...76b&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 76-80.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Line Spectra, Quasars, Red Shift, Color, Emission Spectra, Galactic Evolution

Scientific paper

Spectroscopic observations of 21 QSO candidates are discussed; the candidates were taken mainly from sets of objects described as neutral colored that have been listed as possible identifications of radio sources. Candidate identifications are accepted for study without color discrimination (that is, neutral-colored and even reddish objects are examined) in the hope of removing possible bias against finding QSOs with z greater than approximately 3.5. The largest redshift among the objects described here, however, is z = 2.43. The observations therefore support the tentative conclusion that the decline in numbers of objects with z greater than approximately 3 among these samples is real.

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