Ly-alpha emission from disk absorption systems at high redshift - Star formation in young galaxy disks

Details Ly-alpha emission from disk absorption systems at high redshift - Star formation in young galaxy disks Ly-alpha emission from disk absorption systems at high redshift - Star formation in young galaxy disks

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347...87s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 87-95. Research supported by the University of Califo

Other

42

Cosmology, Emission Spectra, Galactic Evolution, Lyman Alpha Radiation, Quasars, Red Shift, Star Formation, Interstellar Matter, Luminosity, Star Formation Rate, Stellar Evolution

Scientific paper

Narrow-band imaging observations are reported which were made in an attempt to detect Ly-alpha emission from high-redshift candidate galaxy disk systems discovered as high column density absorbers of background QSOs. For four systems with z = 2.3-2.8, no emission is detected to a limit of about 10 to the -16th ergs/sq cm/s, corresponding to luminosity limits of about 10 exp 42-43 ergs/s for the material producing the absorption. The inferred Ly-alpha luminosities lie one to two orders of magnitude below estimates of the Ly-alpha luminosities for active star-forming epochs of many prescriptions for galaxy formation and also considerably below measured Ly-alpha luminosities for other candidate young galaxies detected in radio surveys. A limiting star-formation rate in these systems of about 2-7 solar masses/yr is set; the limit may be about 10 times larger with small but observationally allowable amounts of dust.

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