Talk
The quest for axions
We introduce the strong CP problem and the existence of the Axion as a possible solution. We discuss the possibility that axions are the dark matter of the...
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PublicationThe Rotation Speed of the Companion Star in Aquila X-1We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star...
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PublicationThe Third Fermi Large Area Telescope Catalog of Gamma-Ray PulsarsWe present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs)...
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TalkThermonuclear explosions on neutron starsI will review what we know about Type I Bursts (thermonuclear explosions on the surface of accreting Neutron Stars) and burst oscillations (fluctuations in the...
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PublicationThree-stage Collapse of the Long Gamma-Ray Burst from GRB 160625B Prompt Multiwavelength ObservationsThis article presents the early results of synchronous multiwavelength observations of one of the brightest gamma-ray bursts (GRBs) GRB 160625B with the...
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PublicationTiming the accretion flow around accreting millisecond pulsarsAt present, ten years after they were first discovered, ten accreting millisecond pulsars are known. I present a study of the aperiodic X-ray variability in...
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PublicationTwo New X-Ray Sources in M31 and M31GC J004234+405709 Observed by ChandraWe report the discovery of two previously unseen X-ray sources detected in a 5ks Chandra/ACIS observation starting on 2008-10-13.15 UT as part of our ongoing...
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PublicationX-ray state change in 4U 1608-52The neutron star X-ray transient 4U 1608-52 is often in a state of outburst (e.g. ATel #1113); the Swift/BAT light curve shows three clear outburst peaks so far...
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PublicationX-ray Transients in M31A bright X-ray transient was detected by Chandra on 2002 June 2 with a series of 5 HRC-I snapshots. The new source CXOU J004154.6+405648 (R.A.=00h41m54s.64, Dec...