The variability and periods in the BL Lac AO 0235+164
نویسندگان
چکیده
منابع مشابه
Spectroscopic monitoring of the BL Lac object AO 0235 + 164 ⋆
Aims. Spectroscopic monitoring of BL Lac objects is a difficult task that nonetheless can provide important information on the different components of the active galactic nucleus. Methods. We performed optical spectroscopic monitoring of the BL Lac object AO 0235+164 (z = 0.94) with the VLT and TNG telescopes from Aug. 2003 to Dec. 2004, during an extended WEBT campaign. The flux of this source...
متن کاملUnusual radio variability in the BL Lac object 0235 + 164
We present radio observations at three frequencies and contemporaneous optical monitoring of the peculiar BLLac object AO0235+164. During a three-week campaign with the VLA we observed intraday variability in this source and found a distinct peak which can be identified throughout the radio frequencies and tentatively connected to the R-band variations. This event is characterized by unusual pr...
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Centimeter-wavelength total ux density and linear polarization observations have quantiied the high levels of activity in BL Lac objects and identiied variability timescales ranging from < 1 day to several years. Nearly two decades of single-antenna (UMRAO) observations of a ux-limited sample show that the radioband spectra of the total ux are characteristically at even during this activity: th...
متن کاملBroadband variability of TeV BL Lac objects
BL Lac objects provide a direct view on the high energetic jet and offer the possibility to study the emission processes and the particle acceleration in the jet because of their broad emission range over the whole electromagnetic spectrum up to TeV energies. The variability information gives a direct estimation of the maximum size of the emission region. Under the assumption of the synchrotron...
متن کاملVSOP Monitoring of the Compact BL Lac Object AO 0235 + 164 Sándor
In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observatory Programme (VSOP), with TB > 5.8× 1013K (Frey et al. 2000). The sub-milliarcsec radio structure of this source has been studied with dualfrequency (1.6 and 5GHz), polarization-sensitive VSOP observations during 20...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2014
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921315001921