PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Relationship between Gamma-ray loudness and X-ray spectra of Radio Galaxies
T. Kayanoki* and Y. Fukazawa
Full text: pdf
Pre-published on: July 25, 2023
Published on:
The Fermi satellite has detected ~60 radio galaxies (RGs). We investigate the difference in the properties of X-ray spectra between GeV-loud RGs and GeV-quiet RGs. Our sample comprises 68 objects: 36 GeV-loud RGs and 32 GeV-quiet RGs. For 68 RGs, we analyzed the X-ray spectra of the XMM-Newton, Chandra, NuSTAR, and Swift. Our results show that most GeV-loud RGs do not exhibit significant absorption, while ~50% of the GeV-quiet RGs exhibit significant absorption. This suggests that the jet of GeV-loud RGs is viewed from a small angle, and thus the radiation from the near to the SMBH is not easily blocked by the torus. Moreover, we reported that RGs with a heavy absorption is mostly in the X-ray luminosity range of 10^43-10^45 erg s^-1; however, few RGs with lower and higher luminosity suffer from heavy absorption. This is the same trend as that of Seyfert galaxies.
DOI: https://doi.org/10.22323/1.444.0567
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.