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http://hdl.handle.net/20.500.12386/28543
Title: | The swift observations of BL Lacertae object 1ES 2344+514 | Authors: | Kapanadze, S. Kapanadze, B. ROMANO, Patrizia VERCELLONE, STEFANO Tabagari, L. |
Issue Date: | 2017 | Journal: | ASTROPHYSICS AND SPACE SCIENCE | Number: | 362 | Issue: | 10 | Abstract: | We present the results based on the monitoring of the high energy peaked BL Lacertae object 1ES 2344+514 with the satellite Swift during 2005-2015. Our timing study shows that the source was highly variable on longer (weeks-to-months) time-scales with the 0.3-10 keV flux ranging by a factor of 13.3. The flux variability exhibited an erratic character, changing its amplitude and minimum flux level from flare to flare. In some epochs, an X-ray flare was accompanied by enhanced optical-UV activity, although the uncorrelated 0.3-10 keV and lower-frequency variabilities were also often seen. Our target was significantly passive on intra-day timescales compared to other HBLs. The logparabolic distribution of the X-ray emitting electrons and the underlying physical processes seem to be less important for this object in some epochs, since only seven out of the relatively rich spectra showed a curvature, while the majority of the 0.3-10 keV spectra fitted with a simple powerlaw well. The photon index varied on diverse timescales, and the source showed mainly a "harder-when-brighter" spectral evolution. In the hardness ratio-flux plane, 1ES 2344+514 showed both clockwise and counterclockwise loops, indicating a complex spectral evolution with the flux. | URI: | http://hdl.handle.net/20.500.12386/28543 | URL: | https://link.springer.com/article/10.1007/s10509-017-3170-4 | ISSN: | 0004-640X | DOI: | 10.1007/s10509-017-3170-4 | Bibcode ADS: | 2017Ap&SS.362..196K | Fulltext: | reserved |
Appears in Collections: | 1.01 Articoli in rivista |
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2017ApSS362_196K.pdf | [Administrators only] | 1.1 MB | Adobe PDF |
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