Abstract Details

Name: Chiranjib Konar
Affiliation: AIAS, Amity Univ. Uttar Pradesh, Noida
Conference ID: ASI2017_1410
Title : Episodic Radio Galaxies and Mode of Accretion in Them
Authors and Co-Authors : M.J. Hardcastle(1), J.H. Croston(2), M. Jamrozy(3), A. Hota(4), T.K. Das(5) -------------- (1) School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield (2) School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK (3) Obserwatorium Astronomiczne, Uniwersytet Jagiellonski, ul. Orla 171, 30244 Krak´ow, Poland (4) UM-DAE Centre for Excellence for Basic Sciences, Vidyanagari, Kalina, Mumbai, India (5) Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad-211 010, India
Abstract Type : Oral
Abstract Category : Extragalactic astronomy
Abstract : XMM-Newton X-ray observations of three Double-Double Radio Galaxies (DDRGs) are presented. The X-ray emission from the lobes of the DDRGs have been succefully modelled to be the inverse-Compton scattered cosmic microwave background (CMB) photons against the electrons and positrons of the radio lobes. The outer lobes of all the DDRGs are very close to the equipartition condition. We noticed that (1) no strong [OIII] lines are observed from the host galaxies, and (2) the host galaxies are not detected in all four bands (namely 3.4, 4.6, 12, 22 µm) of Wide-Field Infrared Survey Explorer (WISE) survey. (1) and (2) together suggest that the DDRGs don't have standard accretion disk at their central engines. So, the mode of accretion of these DDRGs might be the hot mode accretion of AGNs.