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Discovery of a 115 Day Orbital Period in the Ultraluminous X-ray Source NGC 5408 X-1
Tod E. Strohmayer
We report the detection of a 115 day periodicity in SWIFT/XRT monitoring data from the ultraluminous X-ray source (ULX) NGC 5408 X-1. Our ongoing campaign samples its X-ray flux ap…
Evidence for an Intermediate Mass Black Hole in NGC 5408 X-1
Tod E. Strohmayer, Richard F. Mushotzky
We report the discovery with XMM-Newton of correlated spectral and timing behavior in the ultraluminous X-ray source (ULX) NGC 5408 X-1. An ~100 ksec pointing with XMM/Newton obtai…
Discovery of a Second Transient Low-Mass X-ray Binary in the Globular Cluster NGC 6440
C. O. Heinke, D. Altamirano, H. N. Cohn +11
We have identified a new transient luminous low-mass X-ray binary, NGC 6440 X-2, with Chandra/ACIS, RXTE/PCA, and Swift/XRT observations of the globular cluster NGC 6440. The disco…
Discovery of a 205.89 Hz accreting-millisecond X-ray pulsar in the globular cluster NGC 6440
D. Altamirano, A. Patruno, C. Heinke +6
We report the discovery of the second accreting millisecond X-ray pulsar (AMXP) in the globular cluster NGC 6440. Pulsations with a frequency of 205.89 Hz were detected with the Ro…
An Fe XXVI Absorption Line in the Persistent Spectrum of the Dipping Low Mass X-ray Binary 1A 1744-361
Fotis P. Gavriil, Tod E. Strohmayer, Sudip Bhattacharyya
We report on Chandra X-ray Observatory (CXO) High-Energy Transmission Grating (HETG) spectra of the dipping Low Mass X-ray Binary (LMXB) 1A 1744-361 during its July 2008 outburst.…
What ignites on the neutron star of 4U 0614+091?
E. Kuulkers, J. J. M. in 't Zand, J. -L. Atteia +10
[abridged] The LMXB 4U 0614+091 is a source of sporadic thermonuclear (type I) X-ray bursts. We find bursts with a wide variety of characteristics in serendipitous wide-field X-ray…