Variability Pattern and the Spectral Evolution of the BL Lacertae Object PKS 2155−304
نویسندگان
چکیده
منابع مشابه
Modeling the Variability of the Bl Lacertae Object Pks 21552304
The bright X-ray–selected BL Lacertae object PKS 21552304 has been the target of two intense multiwavelength campaigns: in 1991 November and in 1994 May. Although the spectral energy distributions at both epochs were quite similar, the source exhibited two very distinct variability patterns that cannot be easily reconciled with homogeneous, one-zone jet models. During the first epoch the variab...
متن کاملVariability of the BL Lacertae Object PKS 2155 − 304
We present a detailed power density spectrum and cross-correlation analysis of the X-ray light curves of the BL Lac object PKS 2155−304 observed with BeppoSAX in 1997 (SAX97) and 1996 (SAX96), aimed at exploring the rapid variability properties and the inter-band cross correlations in the X-rays. We also perform the same analysis on the (archival) X-ray light curve obtained with ASCA in 1994 (A...
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Context. We present the results from a study of the long-term optical spectral variations of BL Lacertae, using the long and wellsampled B and R-band light curves of the Whole Earth Blazar Telescope (WEBT) collaboration, binned on time intervals of 1 day. Aims. To study the relation between the long-term spectral variations and the respective flux variations of the source. Methods. We use cross...
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We present radio observations at three frequencies and contemporaneous optical monitoring of the peculiar BL Lac object AO 0235+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 ...
متن کامل0 A ug 1 99 8 Modeling the variability of the BL Lacertae object PKS 2155 - 304
The bright X-ray selected BL Lacertae object PKS 2155–304 has been the target of two intense multiwavelength campaigns, in November 1991 and in May 1994. Although the spectral energy distributions at both epochs were quite similar, the source exhibited two very distinct variability patterns that cannot be easily reconciled with homogeneous, one–zone jet models. During the first epoch the variab...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X,1538-4357
DOI: 10.1086/308154