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Origin of the UV to X-ray emission of radio galaxy NGC 1275 explored by analyzing its variability

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arxiv 2011.10299 v1 pith:4HR5EV5K submitted 2020-11-20 astro-ph.HE

Origin of the UV to X-ray emission of radio galaxy NGC 1275 explored by analyzing its variability

classification astro-ph.HE
keywords x-raysoftemissionemissionsoriginspectralvariabilityvariations
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We analyze the ultraviolet (UV) and X-ray data of NGC 1275 obtained with {\it Swift}/UVOT, XRT, BAT and {\it Fermi} Large Area Telescope over about 10 years to investigate the origin of the nuclear emission from NGC 1275. We confirm that the UV and soft/hard X-ray fluxes gradually increased along with the GeV gamma rays. At times, short-term variations in the UV or soft X-ray spectral regions showed rapid variations correlated with the GeV gamma-rays. However there was no significant correlation between the UV and soft X-rays. The UV spectrum had a narrow spectral shape that could be represented by single-temperature blackbody radiation. These results could possibly indicate that the long-term variability of UV and X-ray emissions is caused by the jet, while the emissions from the accretion disk contribute to the UV and X-ray bands to some extent.

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