Radio Variability of Radio‐quiet and Radio‐loud Quasars
نویسندگان
چکیده
منابع مشابه
Radio Variability of Radio Quiet and Radio Loud Quasars
The majority of quasars are weak in their radio emission, with flux densities comparable to those in the optical, and energies far lower. A small fraction, about 10%, are hundreds to thousands of times stronger in the radio. Conventional wisdom holds that there are two classes of quasars, the radio quiets and radio louds, with a deficit of sources having intermediate power. Are there really two
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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...
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We report monitoring observations of 20 high-luminosity AGN, 12 of which are radioquiet quasars (RQQs). Intra-night optical variability (INOV) was detected for 13 of the 20 objects, including 5 RQQs. The variations are distinctly stronger and more frequent for blazars than for the other AGN classes. By combining these data with results obtained earlier in our program, we have formed an enlarged...
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We observed three AGN from the Parkes Half-Jansky Flat-spectrum Sample at nearinfrared (NIR) wavelengths to search for micro-variability. In one source, the blue quasar PKS 2243−123, good evidence for NIR micro-variability was found. In the other two sources, PKS 2240−260 and PKS 2233−148, both BL Lacertae objects, no such evidence of variability was detected. We discuss the implications of the...
متن کاملIntranight optical variability of radio-quiet and radio lobe dominated quasars
We present results of a programme of multi-epoch, intra-night optical monitoring of a sample of non-blazar type AGN, which includes seven radio-quiet QSOs (RQQs) and an equal number of radio-loud, lobe-dominated quasars (LDQs), covering a redshift range from about 0.2 to 2.0. These two sets of optically bright and intrinsically luminous QSOs are well matched in the redshift–optical luminosity (...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/425859