Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN
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 ($L_{\rm bol} \sim 10^{42}-10^{44}$ erg s$^{-1}$). The...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
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Oxford University Press
2016
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| _version_ | 1826276906193911808 |
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| author | Sartori, L Schawinski, K Koss, M Treister, E Maksym, W Keel, W Urry, C Lintott, C Wong, O |
| author_facet | Sartori, L Schawinski, K Koss, M Treister, E Maksym, W Keel, W Urry, C Lintott, C Wong, O |
| author_sort | Sartori, L |
| collection | OXFORD |
| description | 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 ($L_{\rm bol} \sim 10^{42}-10^{44}$ erg s$^{-1}$). The temperature structure in the hot gas suggests the presence of a bubble or cavity around the fading AGN ($\mbox{E$_{\rm bub}$} \sim 10^{54} - 10^{55}$ 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 ($L_{\rm bol} \sim 10^{46}$ 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. |
| first_indexed | 2024-03-06T23:20:53Z |
| format | Journal article |
| id | oxford-uuid:68af65ac-68ed-40c6-bd88-25af4d1b6fe5 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:20:53Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:68af65ac-68ed-40c6-bd88-25af4d1b6fe52022-03-26T18:46:39ZExtended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGNJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:68af65ac-68ed-40c6-bd88-25af4d1b6fe5Symplectic Elements at OxfordOxford University Press2016Sartori, LSchawinski, KKoss, MTreister, EMaksym, WKeel, WUrry, CLintott, CWong, OWe 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 ($L_{\rm bol} \sim 10^{42}-10^{44}$ erg s$^{-1}$). The temperature structure in the hot gas suggests the presence of a bubble or cavity around the fading AGN ($\mbox{E$_{\rm bub}$} \sim 10^{54} - 10^{55}$ 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 ($L_{\rm bol} \sim 10^{46}$ 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. |
| spellingShingle | Sartori, L Schawinski, K Koss, M Treister, E Maksym, W Keel, W Urry, C Lintott, C Wong, O Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN |
| title | Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy
injection in the gas around a fading AGN |
| title_full | Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy
injection in the gas around a fading AGN |
| title_fullStr | Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy
injection in the gas around a fading AGN |
| title_full_unstemmed | Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy
injection in the gas around a fading AGN |
| title_short | Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy
injection in the gas around a fading AGN |
| title_sort | extended x ray emission in the ic 2497 hanny s voorwerp system energy injection in the gas around a fading agn |
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