H-alpha emission lines in high redshift quasars

Details H-alpha emission lines in high redshift quasars H-alpha emission lines in high redshift quasars

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..481e&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 481-487 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

Hydrogen, Line Spectra, Lyman Alpha Radiation, Quasars, Red Shift, Emission Spectra, H Ii Regions, Infrared Spectra, Infrared Spectrometers

Scientific paper

The infrared spectra of H alpha lines in 18 medium to high redshift quasars, and nearly simultaneous optical spectra, are presented. The infrared spectra is obtained using the Fabry-Perot infrared grating spectrometer. It is observed that H alpha lines redshifted by an average of 1300 km/s with respect to the lines from high ionization species and that the low ionization lines such as O I and Mg II are shifted by similar, or slightly smaller, amounts. The similarity between the velocities of H alpha and Mg II, O I provides some support for models in which the Balmer lines are produced predominantly in a warm HI region, while the Lyman lines arise mainly in a population of optically thin clouds. Data on the change of Ly alpha/H alpha with relative velocity, are also presented.

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