Discovery of a normal galaxy at Z = 1.018

Details Discovery of a normal galaxy at Z = 1.018 Discovery of a normal galaxy at Z = 1.018

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l..55t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 20, 1991, p. L55-L57. Alfred P. Sloan Foundation-suppo

Mathematics

Logic

16

Cosmology, Emission Spectra, Faint Objects, Galactic Evolution, Quasars, Spectral Line Width

Scientific paper

The discovery is reported of an apparently normal galaxy at z = 1.018, designated G0333 + 3208, found during a long-slit search for faint emission-line objects. One strong emission line has been detected in the wavelength range 3800-8500 A, which is attributed to 0 II forbidden 3727 A. The object is an about 24 mag galaxy with a relatively flat optical spectrum. There are no morphological or spectroscopic signs of an active nucleus in the object, or in its vicinity, and no radio flux from the object down to 200 micro-Jy rms at lambda = 20 cm. From the emission-line flux, assuming photoionization by young stars and a normal IMF, a star formation rate of about 3.5/sq h solar mass/yr (for omega0 = 1). This object would thus be among the most distant of normal galaxies now known. It may be representative of the faint blue or flat-spectrum population, which dominates deep galaxy counts.

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