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Further Constraints on Thermal Quiescent X-Ray Emission from SAX J1808.4-3658
We observed SAX J1808.4-3658 (1808), the first accreting millisecond pulsar, in deep quiescence with XMM-Newton and (near simultaneously) Gemini-South. The X-ray spectrum of 1808 is similar to thatExpand
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Constraints on Thermal X-Ray Radiation from SAX J1808.4–3658 and Implications for Neutron Star Neutrino Emission*
Thermal X-ray radiation from neutron star soft X-ray transients in quiescence provides the strongest constraints on the cooling rates of neutron stars and thus on the interior composition andExpand
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Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient Swift J1357.2−0933
We report our multiwavelength study of the 2011 outburst evolution of the newly discovered black hole candidate X-ray binary Swift J1357.2−0933. We analysed the Swift X-ray Telescope andExpand
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A four-year XMM-Newton/Chandra monitoring campaign of the Galactic centre: analysing the X-ray transients
We report on the results of a four-year long X-ray monitoring campaign of the central 1.2 square degrees of our Galaxy, performed with Chandra and XMM-Newton between 2005 and 2008. Our study focusesExpand
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XMM–Newton and Swift spectroscopy of the newly discovered very faint X-ray transient IGR J17494–3030
A growing group of low-mass X-ray binaries are found to be accreting at very faint X-ray luminosities of <1036 erg s−1 (2-10 keV). One such system is the new X-ray transient IGR J17494-3030. WeExpand
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A DIRECT MEASUREMENT OF THE HEAT RELEASE IN THE OUTER CRUST OF THE TRANSIENTLY ACCRETING NEUTRON STAR XTE J1709−267
The heating and cooling of transiently accreting neutron stars provides a powerful probe of the structure and composition of their crust. Observations of superbursts and cooling of accretion-heatedExpand
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The X-ray flaring properties of Sgr A* during six years of monitoring with Swift
Starting in 2006, Swift has been targeting a region of sime 21' × 21' around Sagittarius A* (Sgr A*) with the onboard X-Ray Telescope. The short, quasi-daily observations offer a unique view of theExpand
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A four-year baseline Swift study of enigmatic X-ray transients located near the Galactic center
We report on continued monitoring observations of the Galactic center carried out by the X-ray telescope aboard the Swift satellite in 2008 and 2009. This campaign revealed activity of the five knownExpand
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Identification of the optical and quiescent counterparts to the bright X-ray transient in NGC~6440
After 3 years of quiescence, the globular cluster NGC 6440 exhibited a bright transient X-ray source turning on in 2001 August, as noted with the Rossi X-Ray Timing ExplorerAll-Sky Monitor. WeExpand
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The behavior of subluminous X-ray transients near the Galactic center as observed using the X-ray telescope aboard Swift
In this paper we report on the spectral analysis of seven X-ray transients, which were found to be active during a monitoring campaign of the Galactic center carried out in 2006 and 2007 using theExpand
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