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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…
Discovery of the Spin Frequency of 4U 0614+09 with SWIFT/BAT
Tod Strohmayer, Craig Markwardt, Erik Kuulkers
We report the discovery of burst oscillations at 414.7 Hz during a thermonuclear X-ray burst from the low mass X-ray binary (LMXB) 4U 0614+091 with the Burst Alert Telescope (BAT)…
Fast X-ray Oscillations During Magnetar Flares
Tod E. Strohmayer
The giant flares produced by highly magnetized neutron stars, "magnetars," are the brightest sources of high energy radiation outside our solar system. Serendipitous observations w…
Thermonuclear Flame Spreading on Rapidly Spinning Neutron Stars: Indications of the Coriolis Force?
Sudip Bhattacharyya, Tod E. Strohmayer
Millisecond period brightness oscillations during the intensity rise of thermonuclear X-ray bursts are likely caused by an azimuthally asymmetric, expanding burning region on the s…
Evidence of a Broad Relativistic Iron Line from the Neutron Star Low-Mass X-ray Binary Serpens X-1
Sudip Bhattacharyya, Tod E. Strohmayer
We report on an analysis of XMM-Newton data from the neutron star low mass X-ray binary (LMXB) Serpens X-1 (Ser X-1). Spectral analysis of EPIC PN data indicates that the previousl…
Discovery of 442-Hz Pulsations from an X-ray Source in the Globular Cluster NGC 6440
Fotis P. Gavriil, Tod E. Strohmayer, Jean H. Swank +1
We report on the serendipitous discovery of a 442-Hz pulsar during a Rossi X-ray Timing Explorer (RXTE) observation of the globular cluster NGC 6440. The oscillation is detected fo…