Emission-line objects near quasi-stellar object absorbers. III - Clustering and colors of moderate-redshift H II regions

Details Emission-line objects near quasi-stellar object absorbers. III - Clustering and colors of moderate-redshift H II regions Emission-line objects near quasi-stellar object absorbers. III - Clustering and colors of moderate-redshift H II regions

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..569y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 569-576.

Astronomy and Astrophysics

Astrophysics

42

Emission Spectra, Galactic Evolution, H Ii Regions, Line Spectra, Quasars, Star Formation, Color-Magnitude Diagram, Cross Sections, Red Shift

Scientific paper

Narrow-band techniques are used to explore three quasar fields to fainter limits in forbidden O II emission-line flux at the redshift of the absorbers. The data presented show emission-line objects a considerable distance (60-270/h kpc) from the quasar line of sight. The large cross sections for absorbers are shown to be due not to single bright galaxies with large gaseous halos, but rather to groups of 30 to 100 star-forming irregulars or blue compact galaxies, one of which lies directly on top of (within 5/h kpc) the quasar line of sight. The radius of such a group is predicted to be 800/h kpc at redshifts greater than about 0.5. Star formation and supernovae rates within members of these groups drops substantially from z of 0.5 to z of 0. That, combined with some merging on times scales of 10 Gyr, causes the cross sections for absorbers to drop substantially by the present epoch.

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