Multiband optical variability studies of BL Lacertae
نویسندگان
چکیده
منابع مشابه
The long-term optical spectral variability of BL Lacertae
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...
متن کاملBroadband Spectra and Variability of BL Lacertae in 2000
We have organized an extensive multiwavelength campaign on BL Lacertae in the second half of 2000. Simultaneous or quasi-simultaneous observations were taken at radio frequencies, in the optical — carried out by the WEBT collaboration —, in X-rays — using BeppoSAX and RXTE —, and at VHE gamma-rays with the CAT and HEGRA Cherenkov telescope facilities. In this paper, we are presenting first resu...
متن کاملModeling 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...
متن کاملThe correlated optical and radio variability of BL Lacertae WEBT data analysis 1994 – 2005 ⋆
Context. Since 1997, BL Lacertae has undergone a phase of high optical activity, with the occurrence of several prominent outbursts. Starting from 1999, the Whole Earth Blazar Telescope (WEBT) consortium has organized various multifrequency campaigns on this blazar, collecting tens of thousands of data points. One of the main issues in the study of this huge dataset has been the search for corr...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv625