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The Advanced X-ray Timing Array (AXTAR)
Deepto Chakrabarty, Paul S. Ray, Tod E. Strohmayer
AXTAR is an X-ray observatory mission concept, currently under study in the U.S., that combines very large collecting area, broadband spectral coverage, high time resolution, highl…
The Spin Distribution of Millisecond X-ray Pulsars
Deepto Chakrabarty
The spin frequency distribution of accreting millisecond X-ray pulsars cuts off sharply above 730 Hz, well below the breakup spin rate for most neutron star equations of state. I r…
The Luminosity and Energy Dependence of Pulse Phase Lags in the Accretion-powered Millisecond Pulsar SAX J1808.4-3658
Jacob M. Hartman, Anna L. Watts, Deepto Chakrabarty
Soft phase lags, in which X-ray pulses in lower energy bands arrive later than pulses in higher energy bands, have been observed in nearly all accretion-powered millisecond pulsars…
A Bursting Radio Transient in the Direction of the Galactic Center
Paul S. Ray, Scott D. Hyman, T. Joseph Lazio +4
The radio sky is poorly sampled for rapidly varying transients because of the narrow field-of-view of most imaging radio telescopes at cm and shorter wavelengths. The emergence of…
A Search for the Near-Infrared Counterpart to GCRT J1745-3009
D. L. Kaplan, S. D. Hyman, S. Roy +5
We present an optical/near-infrared search for a counterpart to the perplexing radio transient GCRT J1745-3009, a source located ~1 degree from the Galactic Center. Motivated by so…
Discovery of the accretion-powered millisecond pulsar SWIFT J1756.9-2508 with a low-mass companion
H. A. Krimm, C. B. Markwardt, C. J. Deloye +10
We report on the discovery by the Swift Gamma-Ray Burst Explorer of the eighth known transient accretion-powered millisecond pulsar, SWIFT J1756.9-2508, as part of routine observat…