منابع مشابه
Polarization properties of broad absorption line QSOs : new statistical clues
We report the results of several statistical tests performed on a large sample of 139 broad absorption line (BAL) QSOs with good quality optical spectra and/or optical polarization data. Correlations between ten optical indices and the polarization degree p0 are systematically searched for. We find six significant non-trivial correlations. In order to identify the most important correlations, w...
متن کاملStatistical lensing of faint QSOs by galaxy clusters
We investigate the anti-correlation between faint high redshift QSOs and low-redshift galaxy groups found by Boyle, Fong & Shanks (1988), on the assumption that it is caused by gravitational lensing of a flat QSO number count, rather than by dust in the galaxy groups, or any other systematic effect. Using an isothermal sphere lens model, the required velocity dispersion is σ = 1286 −91 km s −1....
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15 صفحه اولThe polarization properties of Broad Absorption Line QSOs : observational results
Correlations between BAL QSO intrinsic properties and polarization have been searched for. Some results are summarized here, providing possible constraints on BAL outflow models.
متن کاملThe Rest-frame Extreme Ultraviolet Spectral Properties of Qsos
We use a sample of 332 Hubble Space Telescope spectra of 184 QSOs with z > 0.33 to study the typical ultraviolet spectral properties of QSOs, with emphasis on the ionizing continuum. Our sample is nearly twice as large as that of Zheng et al. (1997) and provides much better spectral coverage in the extreme ultraviolet (EUV). The overall composite continuum can be described by a power law with i...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1972
ISSN: 0074-1809
DOI: 10.1017/s0074180900005933