Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: Energy injection in the gas around a fading AGN

L.F. Sartori, K. Schawinski, M. Koss, E. Treister, W. Peter Maksym, W.C. Keel, C. Megan Urry, C.J. Lintott, Ivy Wong

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Abstract

© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We present deep Chandra X-ray observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp and hosting a fading AGN.We find extended soft X-ray emission from hot gas around the low intrinsic luminosity (unobscured) AGN (Lbol ~ 1042-1044 erg s-1). The temperature structure in the hot gas suggests the presence of a bubble or cavity around the fading AGN (Ebub ~ 1054-1055 erg). A possible scenario is that this bubble is inflated by the fading AGN, which after changing accretion state is now in a kinetic mode. Other possibilities are that the bubble has been inflated by the past luminous quasar (Lbol ~ 1046 erg s-1), or that the temperature gradient is an indication of a shock front from a superwind driven by the AGN. We discuss the possible scenarios and the implications for the AGN-host galaxy interaction, as well as an analogy between AGN and X-ray binaries lifecycles.We conclude that the AGN could inject mechanical energy into the host galaxy at the end of its lifecycle, and thus provide a source for mechanical feedback, in a similar way as observed for X-ray binaries.
Original languageEnglish
Pages (from-to)3629-3636
JournalMonthly Notices of the Royal Astronomical Society
Volume457
Issue number4
DOIs
Publication statusPublished - 21 Apr 2016

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