Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488l..27n&link_type=abstract
Astrophysical Journal Letters v.488, p.L27
Astronomy and Astrophysics
Astronomy
20
Infrared: Galaxies, Line: Profiles, Galaxies: Quasars: Emission Lines
Scientific paper
We present near-infrared spectra of four quasars (QSOs) at z~=1.5 containing the redshifted H alpha , H beta , and[O III] emission lines. The H alpha profile in these objects is redshifted on average by 430+/-170 {km s}^{-1} from the systemic velocity derived from [O III] lambda 5007. This is considerably larger than the Balmer-line velocity shifts measured for low-redshift objects and is consistent with the trend of increasing redshift differences with increasing continuum luminosity. The rest-frame ultraviolet lines in these objects show large (~1000 km s-1) blueshifts from the systemic velocity, and so the large redshifts for H alpha are consistent with the dependence of these redshift differences on ionization potential. These results also show that the systemic velocities of very luminous QSOs are accurately measured only from narrow emission lines.
Iye Masanori
Mori Atsushi
Nishihara Eiji
Okumura Shin-ichiro
Watanabe Etsuji
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