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.

arXiv comment38 pages, 14 figures. Accepted in ApJ

References in corpus (24)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Structured jets in TeV BL Lac objects and radiogalaxies
• XMM-Newton observations of the Perseus Cluster I: The temperature and surface brightness structure
• The 22-Month Swift-BAT All-Sky Hard X-ray Survey
• Fermi Discovery of Gamma-Ray Emission from NGC 1275
• The structure and emission model of the relativistic jet in the quasar 3C 279 inferred from radio to high-energy gamma-ray observations in 2008-2010
• Photopolarimetric Monitoring of Blazars in the Optical and Near-Infrared Bands with the Kanata Telescope. I. Correlations between Flux, Color, and Polarization
• Detection of very-high energy γ-ray emission from NGC 1275 by the MAGIC telescopes
• Kinematics and Excitation of the Molecular Hydrogen Accretion Disc in NGC 1275
• High energy gamma-ray properties of the FR I radio galaxy NGC 1275
• Systematic Study of Gamma-ray bright Blazars with Optical Polarization and Gamma-ray Variability
• Gamma-ray Spectral Evolution of NGC1275 Observed with Fermi-LAT
• Modelling the spectral response of the Swift-XRT CCD camera: Experience learnt from in-flight calibration
• Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays
• Hitomi Observation of Radio Galaxy NGC 1275: The First X-ray Microcalorimeter Spectroscopy of Fe-Kα Line Emission from an Active Galactic Nucleus
• Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC
• KVN observations suggest multiple $\gamma$-ray emission regions in 3C 84
• VLBI and Single Dish Monitoring of 3C84 in the Period of 2009-2011
• Suzaku view of X-ray Spectral Variability of the Radio Galaxy Centaurus A : Partial Covering Absorber, Reflector, and Possible Jet Component
• The origins of the gamma-ray flux variations of NGC 1275 based on 8 years of Fermi-LAT observations
• The long-term millimeter activity of active galactic nuclei
• Fe-K Line Time variability and Ni abundance of Distant Reflector in Seyfert Galaxies
• Nustar view of the central region of the Perseus cluster

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