Recoiling black holes: prospects for detection and implications of spin alignment
Supermassive black hole (BH) mergers produce powerful gravitational wave emission. Asymmetry in this emission imparts a recoil kick to the merged BH, which can eject the BH from its host galaxy altogether. Recoiling BHs could be observed as offset active galactic nuclei (AGN). Several candidates hav...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/1721.1/108467 https://orcid.org/0000-0002-5653-0786 https://orcid.org/0000-0001-8593-7692 |
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| author | Blecha, Laura Sijacki, Debora Kelley, Luke Zoltan Torrey, Paul Vogelsberger, Mark Nelson, Dylan Springel, Volker Snyder, Gregory Hernquist, Lars Torrey, Paul A. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Blecha, Laura Sijacki, Debora Kelley, Luke Zoltan Torrey, Paul Vogelsberger, Mark Nelson, Dylan Springel, Volker Snyder, Gregory Hernquist, Lars Torrey, Paul A. |
| author_sort | Blecha, Laura |
| collection | MIT |
| description | Supermassive black hole (BH) mergers produce powerful gravitational wave emission. Asymmetry in this emission imparts a recoil kick to the merged BH, which can eject the BH from its host galaxy altogether. Recoiling BHs could be observed as offset active galactic nuclei (AGN). Several candidates have been identified, but systematic searches have been hampered by large uncertainties regarding their observability. By extracting merging BHs and host galaxy properties from the Illustris cosmological simulations, we have developed a comprehensive model for recoiling AGN. Here, for the first time, we model the effects of BH spin alignment and recoil dynamics based on the gas richness of host galaxies. We predict that if BH spins are not highly aligned, seeing-limited observations could resolve offset AGN, making them promising targets for all-sky surveys. For randomly oriented spins, ≲ 10 spatially offset AGN may be detectable in Hubble Space Telescope-Cosmological Evolution Survey, and >10³ could be found with the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS), the Large Synoptic Survey Telescope (LSST), Euclid, and the Wide-Field Infrared Survey Telescope (WFIRST). Nearly a thousand velocity offset AGN are predicted within the Sloan Digital Sky Survey (SDSS) footprint; the rarity of large broad-line offsets among SDSS quasars is likely due in part to selection effects but suggests that spin alignment plays a role in suppressing recoils. None the less, in our most physically motivated model where alignment occurs only in gas-rich mergers, hundreds of offset AGN should be found in all-sky surveys. Our findings strongly motivate a dedicated search for recoiling AGN. |
| first_indexed | 2024-09-23T13:39:08Z |
| format | Article |
| id | mit-1721.1/108467 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:39:08Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/1084672022-09-28T15:18:51Z Recoiling black holes: prospects for detection and implications of spin alignment Blecha, Laura Sijacki, Debora Kelley, Luke Zoltan Torrey, Paul Vogelsberger, Mark Nelson, Dylan Springel, Volker Snyder, Gregory Hernquist, Lars Torrey, Paul A. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Torrey, Paul A. Vogelsberger, Mark Supermassive black hole (BH) mergers produce powerful gravitational wave emission. Asymmetry in this emission imparts a recoil kick to the merged BH, which can eject the BH from its host galaxy altogether. Recoiling BHs could be observed as offset active galactic nuclei (AGN). Several candidates have been identified, but systematic searches have been hampered by large uncertainties regarding their observability. By extracting merging BHs and host galaxy properties from the Illustris cosmological simulations, we have developed a comprehensive model for recoiling AGN. Here, for the first time, we model the effects of BH spin alignment and recoil dynamics based on the gas richness of host galaxies. We predict that if BH spins are not highly aligned, seeing-limited observations could resolve offset AGN, making them promising targets for all-sky surveys. For randomly oriented spins, ≲ 10 spatially offset AGN may be detectable in Hubble Space Telescope-Cosmological Evolution Survey, and >10³ could be found with the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS), the Large Synoptic Survey Telescope (LSST), Euclid, and the Wide-Field Infrared Survey Telescope (WFIRST). Nearly a thousand velocity offset AGN are predicted within the Sloan Digital Sky Survey (SDSS) footprint; the rarity of large broad-line offsets among SDSS quasars is likely due in part to selection effects but suggests that spin alignment plays a role in suppressing recoils. None the less, in our most physically motivated model where alignment occurs only in gas-rich mergers, hundreds of offset AGN should be found in all-sky surveys. Our findings strongly motivate a dedicated search for recoiling AGN. 2017-04-27T19:35:02Z 2017-04-27T19:35:02Z 2015-12 2015-11 Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 http://hdl.handle.net/1721.1/108467 Blecha, Laura; Sijacki, Debora; Kelley, Luke Zoltan; Torrey, Paul; Vogelsberger, Mark; Nelson, Dylan; Springel, Volker; Snyder, Gregory and Hernquist, Lars. “Recoiling Black Holes: Prospects for Detection and Implications of Spin Alignment.” Monthly Notices of the Royal Astronomical Society 456, no. 1 (December 18, 2015): 961–989. https://orcid.org/0000-0002-5653-0786 https://orcid.org/0000-0001-8593-7692 en_US http://dx.doi.org/10.1093/mnras/stv2646 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press arXiv |
| spellingShingle | Blecha, Laura Sijacki, Debora Kelley, Luke Zoltan Torrey, Paul Vogelsberger, Mark Nelson, Dylan Springel, Volker Snyder, Gregory Hernquist, Lars Torrey, Paul A. Recoiling black holes: prospects for detection and implications of spin alignment |
| title | Recoiling black holes: prospects for detection and implications of spin alignment |
| title_full | Recoiling black holes: prospects for detection and implications of spin alignment |
| title_fullStr | Recoiling black holes: prospects for detection and implications of spin alignment |
| title_full_unstemmed | Recoiling black holes: prospects for detection and implications of spin alignment |
| title_short | Recoiling black holes: prospects for detection and implications of spin alignment |
| title_sort | recoiling black holes prospects for detection and implications of spin alignment |
| url | http://hdl.handle.net/1721.1/108467 https://orcid.org/0000-0002-5653-0786 https://orcid.org/0000-0001-8593-7692 |
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