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Tidal disruption events seen in the XMM-Newton slew survey

Published online by Cambridge University Press:  23 June 2017

Richard Saxton ,
S. Komossa ,
Andrew Read ,
Paulina Lira ,
Kate D. Alexander  and
Iain Steele
Richard Saxton
Affiliation:
XMM SOC, ESAC, Apartado 78, 28691 Villanueva de la Cañada, Madrid, Spain email: [email protected]
S. Komossa
Affiliation:
QianNan Normal University for Nationalities, Longshan Street, Duyun City of Guizhou Province, China
Andrew Read
Affiliation:
Dept. of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, U.K.
Paulina Lira
Affiliation:
Universidad de Chile, Observatorio Astronomico Nacional Cerro Calan, Santiago, Chile
Kate D. Alexander
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
Iain Steele
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1LD, UK
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Abstract

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XMM-Newton performs a survey of the sky in the 0.2-12 keV X-ray band while slewing between observation targets. The sensitivity in the soft X-ray band is comparable with that of the ROSAT all-sky survey, allowing bright transients to be identified in near real-time by a comparison of the flux in both surveys. Several of the soft X-ray flares are coincident with galaxy nuclei and five of these have been interpreted as candidate tidal disruption events (TDE). The first three discovered had a soft X-ray spectrum, consistent with the classical model of TDE, where radiation is released during the accretion phase by thermal processes. The remaining two have an additional hard, power-law component, which in only one case was accompanied by radio emission. Overall the flares decay with the classical index of t−5/3 but vary greatly in the early phase.

Keywords

X-rays: galaxiesgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 123 - 126
Copyright
Copyright © International Astronomical Union 2017 

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