Abstract Details

Name: Sumana Nandi
Affiliation: KTH Royal Institute of Technology, Stockholm
Conference ID: ASI2017_867
Title : A misaligned double-double radio galaxy hosted by a binary supermassive black hole system
Authors and Co-Authors : M. Jamrozy$^{2}$, R. Roy$^{3}$, J. Larsson$^{1}$, D.J. Saikia$^{4,5}$, M. Baes$^{6}$ and M. Singh$^{7}$ $^1$KTH, Department of Physics, and the Oskar Klein Centre, AlbaNova, SE-106 91 Stockholm, Sweden $^2$Obserwatorium Astronomiczne, Uniwersytet Jagiello\'nski, ul. Orla 171, 30-244 Krak\'ow, Poland $^3$The Oskar Klein Centre, Department of Astronomy, Stockholm University, AlbaNova, 10691 Stockholm, Sweden $^4$Cotton College State University, Panbazar, Guwahati 781 001, India $^5$National Centre for Radio Astrophysics, TIFR, Pune University Campus, Post Bag 3, Pune 411 007, India $^6$Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium $^7$Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263 129, India
Abstract Type : Oral
Abstract Category : Extragalactic astronomy
Abstract : Double-double radio galaxies (DDRGs) constitute a rare class of extragalactic radio sources that undergo multiple cycles of jet eruption. For DDRGs the out flow of new jet mostly follow the same direction of the previous jets. There are few examples of “misaligned DDRGs” which undergo different axis orientation for two epochs. The change in direction of new jet may happen due to coalescence of supermassive black holes (SMBHs). Historically radio galaxies with rapid change of jet direction in particular X-shaped galaxies are the candidates to detect the binary black hole as they are potentially dominant contributors to the gravitational wave background. Recently, the double-peaked emission lines are one of the adopted indicators to search for binary black holes. The split in emission lines are the possible out come of a bound pair of SMBHs, moving with their own characteristic velocity. In this study we report a unique restarted radio source J1328+2752, with ~30° off axis jet emission. More over this source is hosted by a giant elliptical with double-peaked emission lines. This is the first time both signatures has been detected in the same source. In fact such systems provide direct observational evidence for galaxy mergers as triggers of multiple epochs of jet activity.