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

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.

38 pages, 14 figures. Accepted in ApJ

References in corpus (2)

• Systematic Study of Gamma-ray bright Blazars with Optical Polarization and Gamma-ray Variability
• Modelling the spectral response of the Swift-XRT CCD camera: Experience learnt from in-flight calibration

Cited by in corpus (4)

• Probing the circumnuclear environment of NGC1275 with High-Resolution X-ray spectroscopy
• Multiwavelength monitoring of NGC 1275 over a decade: Evidence of a shift in synchrotron peak frequency and long-term multi-band flux increase
• Very High-energy Gamma-Ray Episodic Activity of Radio Galaxy NGC 1275 in 2022-2023 Measured with MACE
• Detection of Compton scattering in the jet of 3C 84