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Showing 1 to 12 of 12 for “"QSOs"”.
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Unification of QSOs via black hole and accretion properties
… address all the object-to-object differences in QSOs. Physical differences of the underlying engine, such as luminosity, black hole mass (MBH) and Eddington ratio (L/LEdd), are crucial to our understanding of QSO central engines. Broad Absorption Line (BAL) QSOs are a particularly interesting …
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THE OPTICAL POLARIZATION OF QUASI-STELLAR AND BL LACERTAE OBJECTS
… linear polarization of quasi-stellar objects (QSOs) and BL Lacertae objects. I present extensive polarimetric observations of a large sample of QSOs, systematically analyze the correlations between polarization and other properties of QSOs, compare t
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Optical variability of radio-luminous palomar-green quasars
… more variability than in a sample of radio-quiet QSOs if the shock in the jet is the cause of variability. There is evidence that our radio-loud QSOs are more likely to have short-term variations compared to samples of radio-quiet QSOs. This finding supports the model of QSO variability being …
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QSO Absorption Lines
… systems seen in the spectra of high redshift QSOs. The Anglo-Australian Telescope has been used to obtain high resolution spectra of several bright QSOs. Considerable effort has gone into developing statistical techniques for profile fitting to the data to objectively and reliably extract the …
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The AGN-host galaxy connection : new insights from the extended ionised gas
… are then classified as Quasi-Stellar Objects (QSOs). Some mechanisms are needed to trigger the nuclear activity in galaxies and to feed the nuclei with gas. Among several possibilities, such as gravitational interactions, bar instabilities, and smooth gas accretion from the environment, the …
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Constraining the QSO luminosity function using gravitational lensing statistics
… and may include up to 10 multiply imaged QSOs. We discuss the QSO analysis pipeline developed to compute the gravitational lensing probabilities of each QSO and then present the constraints on the QSO luminosity function and compare them to results in the literature. Our results confirm …
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Characterization of the Galactic White Dwarf Population in the Next Generation Virgo Cluster Survey
… selection was used to separate white dwarfs from QSOs and main-sequence stars. Photometric distances are calculated using model colour-absolute magnitude relations. Proper motions are calculated by using the difference in positions between objects from the Sloan Digital Sky Survey and the NGVS. …
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Quasar continuum fitting and silicon absorption on the low redshift intergalactic medium
… 832 Ly[alpha] absorbers from 328 spectra of 204 QSOs taken from the Hubble Space Telescope archive. We develop a new, reproducible method of quasar continuum fitting, designed to quickly identify absorption lines and measure the relative line strength (a proxy for equivalent width). Our method, …
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The kinematic and thermal Sunyaev-Zel'dovich effects as probes of cosmology and astrophysics
… confirmed quasi-stellar objects (QSOs), but obtain only a low-significance hint of a tSZ signature. This analysis leads to a lower mean thermal energy than reported in some previous studies which were contaminated by dust emission. A comparison of these results to hydrodynamical …