Red and Blue Shifted Broad Lines in High Luminosity QSOs

Details Red and Blue Shifted Broad Lines in High Luminosity QSOs Red and Blue Shifted Broad Lines in High Luminosity QSOs

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.1105m&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #11.05; Bulletin of the American Astronomical Society, Vol. 30, p.832

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed a sample of 25 high luminosity QSOs, in the range 2.0 ≲ z ≲ 2.5, at 1.6micron with the near-infrared spectrograph FSPEC on the Multiple Mirror Telescope. We have measured the systemic redshift z_sys by direct detection of the strong [O 3]lambda5007 line emitted from the narrow-line-region. We have found that the broad Hβ lines, from the same spectra, have a systematic mean red shift of 530+/-80 km s(-1) with respect to systemic. From data in the literature, we have found that the high ionization, rest-frame ultraviolet broad lines C 4lambda1549 and Lyalpha are systematically blue shifted ~ 1500 km s(-1) and ~ 1000 km s(-1) , respectively, from systemic. Therefore, estimating the ionizing flux from the inter-galactic-medium J_ν() IGM via the Proximity Effect, using redshift measurements from these two broad line species, results in an over-estimation of J_ν() IGM by factors of 2.5-4.0. Furthermore, related calculations of the lower limit for the density of baryons Omega_b will be over-estimated by factors of 1.6-2.0. However, the low ionization broad line Mg 2lambda2798 is within 100 km s(-1) of systemic, and thus would be the line of choice for determining the true redshift of distant (z>1) QSOs without near-infrared spectroscopy.

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