Strong associated C 4 absorption in low redshift quasars

Details Strong associated C 4 absorption in low redshift quasars Strong associated C 4 absorption in low redshift quasars

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9028469t&link_type=abstract

Final Technical Report, period ending 30 Nov. 1989 Columbia Univ., New York, NY. Dept. of Astronomy.

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Interstellar Gas, Quasars, Stellar Spectra, Iue, Radial Velocity, Red Shift, Signal Distortion, Stellar Luminosity

Scientific paper

IUE spectra of quasars were used to determine the frequency of occurrence of strong associated C 4 absorption systems at low red shifts. Four systems are found with rest frame equivalent width (REW) greater than 5 angstroms in the spectra of 38 quasars. This rate of occurrence of 0.12 is not significantly different from the rate of 0.064 determined for high red shift quasars. The detected strong associated systems are all in low red shift quasars which have been imaged from the ground. One of the quasars is unusual, having two nuclei, a close companion and distorted isotopes. Two of the others also have close companion galaxies at projected distances of under 100 kpc. The conclusion was made that a much larger sample is needed.

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