Beaming in Radio-Quiet AGN
نویسندگان
چکیده
منابع مشابه
Intranight polarization variability in radio-loud and radio-quiet AGN
Intranight polarization variability in AGN has not been studied extensively so far. Studying the variability in polarization makes it possibly to distinguish between different emission mechanisms. Thus it can help answering the question if intranight variability in radio-loud and radio-quiet AGN is of the same or of fundamentally different origin. In this paper we investigate intranight polariz...
متن کاملRadio-Variability in Radio-Quiet Quasars and Low-Luminosity AGN
We report on two surveys of radio-weak AGN to look for radio variability. We find significant variability with an RMS of 10-20% on a timescale of months in radio-quiet and radio-intermediate quasars. This exceeds the variability of radio cores in radio-loud quasars (excluding blazars), which vary only on a few percent level. The variability in radio-quiet quasars confirms that the radio emissio...
متن کاملThe AGN Paradigm: Radio-Quiet Objects
The current paradigm for radio-quiet AGNs is reviewed, taking into account new results from recent large-scale surveys carried out from the ground and from space. Topics include structure of the central engine, AGN demography, fueling/triggering processes, and connection between the supermassive black hole, host galaxy, circumnuclear starburst and AGN. Dependences on AGN power and lookback time...
متن کاملRadio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S1.4GHz < 1mJy
Understanding the interplay between black-hole accretion and star formation, and how to disentangle the two, is crucial to our understanding of galaxy formation and evolution. To investigate, we use a combination of optical and near-infrared photometry to select a sample of 74 quasars from the VISTA Deep Extragalactic Observations (VIDEO) Survey, over 1 deg. The depth of VIDEO allows us to stud...
متن کاملThe cluster environments of powerful radio - loud and radio - quiet AGN
The spatial clustering amplitude (B gq) is determined for a sample of 44 powerful AGN at z ≃ 0.2. No significant difference is detected in the richness of the cluster environments of the radio-loud and radio-quiet sub-samples, both of which typically inhabit environments as rich as Abell Class ≃ 0. Comparison with radio luminosity-matched samples from Hill & Lilly (1991) and Wold et al. (2000a)...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s0252921100044262