Broad-Line Profile Variability
نویسندگان
چکیده
منابع مشابه
Arp 102B: variability patterns of the Hα line profile as evidence for gas rotation in the broad-line region
We present results of an optical spectral monitoring campaign of the Seyfert 1 galaxy Arp 102B for a period of about 4 years between 1992 July and 1996 October carried out with a CCD spectrograph at the 2.6-m Shajn Telescope of the Crimean Astrophysical Observatory. Our data set consists of 20 Hα and 1 Hβ region spectra. During the monitoring period, the Hα line and continuum fluxes have shown ...
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CRTS J084133.15+200525.8 is an optically bright quasar at z = 2.345 that has shown extreme spectral variability over the past decade. Photometrically, the source had a visual magnitude of V ∼ 17.3 between 2002 and 2008. Then, over the following five years, the source slowly brightened by approximately one magnitude, to V ∼ 16.2. Only ∼ 1 in 10,000 quasars show such extreme variability, as quant...
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Broad absorption lines (BALs) in quasar spectra indicate high-velocity outflows that may be present in all quasars and could be an important contributor to feedback to their host galaxies. Variability studies of BALs help illuminate the structure, evolution and basic physical properties of the outflows. Here we present further results from an ongoing BAL monitoring campaign of a sample of 24 lu...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s0252921100039968