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Swift J1734.5-3027: a new long Type-I X-ray bursting source

Journal
Date Issued
2015
Author(s)
Bozzo, E.
•
•
Falanga, M.
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Ferrigno, C.
•
•
Krimm, H. A.
DOI
Description
E.B. thanks the New York University at Abu Dhabi for the kind hospitality during part of this work and Milvia Capalbi for her precious support during the analysis of some XRT observations. We thank Phil Evans for useful discussions. A.P. is supported by a Juan de la Cierva fellowship, and acknowledges grants AYA2012-39303, SGR2009-811, and iLINK2011-0303. P.R. acknowledges contract ASI-INAF I/004/11/0. We thank N. Schartel and the XMM-Newton team for having promptly performed the ToO observation analyzed in this paper. We are indebted to the Swift PI and operations team for the continuous support during the monitoring campaign of X-ray transients.
Abstract
Swift J1734.5-3027 is a hard X-ray transient discovered by Swift while undergoing an outburst in September 2013. Archival observations showed that this source underwent a previous episode of enhanced X-ray activity in 2013 May-June. In this paper we report on the analysis of all X-ray data collected during the outburst in 2013 September, the first that could be intensively followed up by several X-ray facilities. Our dataset includes INTEGRAL, Swift, and XMM-Newton observations. From the timing and spectral analysis of these observations, we show that a long Type-I X-ray burst took place during the source outburst, making Swift J1734.5-3027 a new member of the class of bursting neutron star low-mass X-ray binaries. The burst lasted for about 1.9 ks and reached a peak flux of (6.0 ± 1.8) × in the 0.5-100 keV energy range. The estimated burst fluence in the same energy range is (1.10 ± 0.10) × . By assuming that a photospheric radius expansion took place during the first ~200 s of the burst and that the accreted material was predominantly composed by He, we derived a distance to the source of 7.2 ± 1.5 kpc.
Volume
579
Start page
A56
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2015A&A...579A..56B
Rights
open.access
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