Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2-8238

G. C. Brown, A. J. Levan, E. R. Stanway, T. Kruehler, N. R. Tanvir, L. J. M. Davies, A. Fruchter, S. B. Cenko, B. D. Metzger

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Abstract

We present late-time follow-up of the relativistic tidal disruption flare (rTDF) candidate Swift J1112.2-8238. We confirm the previously determined redshift of z = 0.8900 +/- 0.0005 based on multiple emission line detections. Hubble Space Telescope 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 +/- 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 rTDFs. While the transient location is similar to 2 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.

Original languageEnglish
Pages (from-to)4469-4479
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number4
DOIs
Publication statusPublished - Dec 2017

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