Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2−8238
| Autor: | Andrew J. Levan, Luke J. M. Davies, A. S. Fruchter, G. C. Brown, Nial R. Tanvir, Thomas Krühler, B. D. Metzger, S. B. Cenko, Elizabeth R. Stanway |
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| Rok vydání: | 2017 |
| Předmět: |
Swift
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Library science Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences law.invention Telescope Spitzer Space Telescope law Observatory 0103 physical sciences 010303 astronomy & astrophysics QC Astrophysics::Galaxy Astrophysics QB computer.programming_language High Energy Astrophysical Phenomena (astro-ph.HE) Physics 010308 nuclear & particles physics Astronomy Astronomy and Astrophysics Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena computer |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stx2193 |
| Popis: | We present late-time follow-up of the relativistic tidal disruption flare candidate Swift J1112.2-8238. We confirm the previously determined redshift of $z=0.8900\pm0.0005$ based on multiple emission line detections. {\em HST} imaging of the host galaxy indicates a complex and distorted morphology with at least two spatially distinct components. These are offset in velocity space by less than 350\,km\,s$^{-1}$ in VLT/X-Shooter observations, suggesting that the host is undergoing interaction with another galaxy. The transient position is consistent to 2.2$\sigma$ with the centre of a bulge-like component at a distance of 1.1$\pm$0.5\,kpc from its centre. Luminous, likely variable radio emission has also been observed, strengthening the similarities between Swift J1112.2-8238 and other previously identified relativistic tidal disruption flares. While the transient location is $\sim2\sigma$ from the host centroid, the disrupted nature of the host may provide an explanation for this. The tidal disruption model remains a good description for these events. Comment: 12 pages, 6 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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