Observing the unusual neutron star transient Swift J1749.4-2807 in quiescence

Details Observing the unusual neutron star transient Swift J1749.4-2807 in quiescence Observing the unusual neutron star transient Swift J1749.4-2807 in quiescence

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..192d&link_type=abstract

XMM-Newton Proposal ID #06556701

Computer Science

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Swift J1749.4-2

Scientific paper

We propose a 50 ksec XMM-Newton observation of the transiently accreting neutron star Swift J1749.4-2807 during its quiescent state. The soft X-ray behavior of our target is highly unusual for transiently accreting X-ray binaries: after it exhibited a type-I X-ray burst, its 2-10 keV luminosity decreased by nearly three orders of magnitude in about 1 day, all the way down to its quiescent level of ~1E33 erg/s. With our proposed observation we aim to investigate the possibility that low-level accretion occurs by studying the quiescent spectral shape and searching for X-ray variability. It also allows us to constrain contributions from a thermal component, thereby probing a new parameter regime for neutron star cooling models.

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