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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: 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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