The X-ray quiescence of Swift J195509.6+261406 (GRB 070610): an optical bursting X-ray binary?

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Title: The X-ray quiescence of Swift J195509.6+261406 (GRB 070610): an optical bursting X-ray binary?
Authors: Rea, Nanda | Jonker, Peter G. | Nelemans, Gijs | Pons, José A. | Kasliwal, Mansi M. | Kulkarni, Shrinivas R. | Wijnands, Rudy
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Stars: magnetic field | X-rays: individual (SWIFT J195509.6+261406) | X-rays: stars
Knowledge Area: Astronomía y Astrofísica
Issue Date: 15-Feb-2011
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters. 2011, 729(2): L21. doi:10.1088/2041-8205/729/2/L21
Abstract: We report on an ~63 ks Chandra observation of the X-ray transient Swift J195509.6+261406 discovered as the afterglow of what was first believed to be a long-duration gamma-ray burst (GRB 070610). The outburst of this source was characterized by unique optical flares on timescales of second or less, morphologically similar to the short X-ray bursts usually observed from magnetars. Our Chandra observation was performed ~2 years after the discovery of the optical and X-ray flaring activity of this source, catching it in its quiescent state. We derive stringent upper limits on the quiescent emission of Swift J195509.6+261406, which argues against the possibility of this object being a typical magnetar. Our limits show that the most viable interpretation on the nature of this peculiar bursting source is a binary system hosting a black hole or a neutron star with a low-mass companion star (<0.12 M ☉) and with an orbital period smaller than a few hours.
Sponsor: N.R. is supported by a Ramón y Cajal fellowship through Consejo Superior de Investigaciones Científicas, by grants AYA2009-07391 and SGR2009-811. P.G.J. and G.N. acknowledge support from a VIDI grant from the Netherlands Organization for Scientific Research.
ISSN: 2041-8205 (Print) | 2041-8213 (Online)
DOI: 10.1088/2041-8205/729/2/L21
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2011. The American Astronomical Society
Peer Review: si
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Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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