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

TL;DR

This study investigates the origin of UV to X-ray emissions in NGC 1275 by analyzing 10 years of multiwavelength data, revealing variability patterns and potential jet and accretion disk contributions.

Contribution

It provides a detailed multiwavelength variability analysis of NGC 1275, highlighting the possible roles of jet activity and accretion disk in its emission.

Findings

UV and X-ray fluxes increase with gamma rays over years

Short-term UV/X-ray variations correlate with gamma rays

UV spectrum consistent with blackbody radiation

Abstract

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.