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

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Brown, Gregory C., Levan, Andrew J., Stanway, Elizabeth R., Krühler, T., Tanvir, N. R., Davies, L. J. M., Fruchter, A. S., Cenko, S. B. and Metzger, B. D. (2017) Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2-8238. Monthly Notices of the Royal Astronomical Society, 472 (4). pp. 4469-4479. doi:10.1093/mnras/stx2193

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Official URL: http://dx.doi.org/10.1093/mnras/stx2193

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Abstract

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±0.0005 based on multiple emission line detections. 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 2.2σ with the centre of a bulge-like component at a distance of 1.1±0.5kpc 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 ∼2σ 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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Black holes (Astronomy), Gamma rays, Stars--Masses
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 28 August 2017
Dates:
DateEvent
28 August 2017Published
23 August 2017Accepted
Volume: 472
Number: 4
Page Range: pp. 4469-4479
DOI: 10.1093/mnras/stx2193
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/L000733/1Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/M006492/1Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
UNSPECIFIEDRoyal Astronomical Societyhttp://dx.doi.org/10.13039/501100000698
UNSPECIFIEDCommonwealth Scientific and Industrial Research Organisationhttp://dx.doi.org/10.13039/501100000943
UNSPECIFIEDMidlands Physics Alliance (Organisation)UNSPECIFIED
UNSPECIFIEDUniversity of Warwick. Institute of Advanced Study (IAS)UNSPECIFIED
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