Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2406m&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #24.06; Bulletin of the American Astronomical Society, Vol. 27, p.846
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Information on the chemical composition and history of the gas in Quasars can be obtained from the ratios of broad emission lines. Hamann and Ferland(1993, ApJ), working with data from the literature, found a trend for higher metallicities at higher redshifts. This seems to imply IMFs favouring high-mass stars in the high redshift quasars, and also high star formation rates and short timescales for infall. Similar conditions are thought to be present during the formation of giant ellipticals. The purpose of the present study is to verify the Hamann and Ferland results and also to try to automate the line measuring process. The abundances of broad-line regions in a sample of 304 QSOs from the Large Bright Quasar Survey are studied. The relative abundances are estimated via NV/CIV and NV/HeII. The line intensities are measured in an automated fashion from the digital spectra, integrating the flux above the continuum in fixed(rest) wavelength windows. The results are compared with line intensities obtained by gaussian fitting. The same process is followed with IUE data to verify the redshift-metallicity relation.
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