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1987, 4. überarb. Aufl., Kleine naturwissenschaftliche Bibliothek, ISBN 9783322003249, Volume Bd. 29, 83
Book
1967, A Series of books in astronomy and astrophysics, 235
Book
Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, 01/2016, Volume 457, Issue 1, pp. 389 - 404
We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with repeat... 
Galaxies: active | Accretion, accretion discs | Quasars: general | Quasars: emission lines | Physical Sciences | Astronomy & Astrophysics | Science & Technology | Quasars | Dust | Spectrum analysis | Astronomy | Spectroscopy | Searching | Sky surveys (astronomy) | Mathematical models | Criteria | Photometry | Physics - Astrophysics of Galaxies
Journal Article
Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, 12/2012, Volume 427, Issue 4, pp. 3081 - 3102
ABSTRACT We analyse several large samples of active galactic nuclei (AGNs) in order to establish the best tools required to study the evolution of black hole... 
galaxies: nuclei | galaxies: active | quasars: emission lines – quasars: general | General | Nuclei - quasars | Galaxies | Active - galaxies | Emission lines - quasars
Journal Article
Astrophysical journal. Letters, ISSN 2041-8213, 03/2016, Volume 819, Issue 2, pp. L37 - L37
OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in a binary black hole model. The... 
quasars: general | quasars: supermassive black holes | quasars: individual (OJ.,Q287) | Black hole physics | Physical Sciences | Astronomy & Astrophysics | Science & Technology | Gravitation | Accuracy | Binary stars | Flares | Displays | Black holes (astronomy) | Mathematical models | Outbursts
Journal Article
Monthly Notices of the Royal Astronomical Society, ISSN 0035-8711, 2013, Volume 433, Issue 3, pp. 2485 - 2496
We present an investigation into how well the properties of the accretion flow on to a supermassive black hole may be coupled to those of the overlying hot... 
Galaxies: Active | Accretion | Accretion discs | Galaxies: Nuclei | Quasars: Emission lines | X-rays: galaxies | Quasars: General | Physical Sciences | Astronomy & Astrophysics | Science & Technology | Statistical analysis | Black holes | Spectrum analysis | Corona | X ray astronomy | Accretion disks | Star & galaxy formation
Journal Article
The Astrophysical journal. Supplement series, ISSN 1538-4365, 01/2009, Volume 180, Issue 1, pp. 67 - 83
Journal Article
Astronomy and astrophysics (Berlin), ISSN 0004-6361, 2012, Volume 545, p. A48
Context. After years of modest optical activity, the quasar-type blazar 4C 38.41 (B3 1633+382) experienced a large outburst in 2011, which was detected... 
Quasars: individual: 4C 38.41 | Galaxies: active | Quasars: general | Galaxies: jets | Physical Sciences | Astronomy & Astrophysics | Science & Technology
Journal Article