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Constraining the properties of neutron star crusts with the transient low-mass X-ray binary Aql X-1
A. C. Waterhouse, N. Degenaar, R. Wijnands +4
Aql X-1 is a prolific transient neutron star low-mass X-ray binary that exhibits an accretion outburst approximately once every year. Whether the thermal X-rays detected in interve…
A LOFAR census of millisecond pulsars
V. I. Kondratiev, J. P. W. Verbiest, J. W. T. Hessels +29
We report the detection of 48 millisecond pulsars (MSPs) out of 75 observed thus far using the LOFAR in the frequency range 110-188 MHz. We have also detected three MSPs out of nin…
Limits on thermal variations in a dozen quiescent neutron stars over a decade
Arash Bahramian, Craig O. Heinke, Nathalie Degenaar +5
In quiescent low-mass X-ray binaries (qLMXBs) containing neutron stars, the origin of the thermal X-ray component may be either release of heat from the core of the neutron star, o…
Neutron star crust cooling in the Terzan 5 X-ray transient Swift J174805.3-244637
N. Degenaar, R. Wijnands, A. Bahramian +10
When neutron stars reside in transient X-ray binaries, their crustal layers become heated during accretion outbursts and subsequently cool in quiescence. Observing and modeling thi…
The Reflares and Outburst Evolution in the Accreting Millisecond Pulsar SAX J1808.4-3658: a Disk Truncated Near Co-rotation?
A. Patruno, D. Maitra, P. A. Curran +5
The accreting millisecond X-ray pulsar SAX J1808.4--3658 shows peculiar low luminosity states known as "reflares" after the end of the main outburst. During this phase the X-ray lu…
The Swift X-ray monitoring campaign of the center of the Milky Way
N. Degenaar, R. Wijnands, J. M. Miller +3
In 2006 February, shortly after its launch, Swift began monitoring the center of the Milky Way with the onboard X-Ray Telescope using short 1-ks exposures performed every 1-4 days.…