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Breaking the AMSP mould: the increasingly strange case of HETE J1900.1-2455
Duncan K. Galloway, Edward H. Morgan, Deepto Chakrabarty
We present ongoing Rossi X-ray Timing Explorer (RXTE) monitoring observations of the 377.3 Hz accretion-powered pulsar, HETE J1900.1-2455 Activity continues in this system more tha…
Deviations from the Flux-Recurrence Time Relationship in GS 1826-238: Potential Transient Spectral Changes
Thomas W. J. Thompson, Duncan K. Galloway, Richard E. Rothschild +1
The low-mass X-ray binary GS 1826-238 is presently unique for its consistently regular bursting behavior. In previous Rossi X-Ray Timing Explorer (RXTE) measurements between 1997 N…
Biases for neutron-star mass, radius and distance measurements from Eddington-limited X-ray bursts
Duncan Galloway, Feryal Ozel, Dimitrios Psaltis
Eddington-limited X-ray bursts from neutron stars can be used in conjunction with other spectroscopic observations to measure neutron star masses, radii, and distances. In order to…
Accreting neutron star spins and the equation of state
Duncan Galloway
X-ray timing of neutron stars in low-mass X-ray binaries (LMXBs) with RXTE has since 1996 revealed several distinct high-frequency phenomena. Among these are oscillations during th…
Models of Type I X-ray Bursts from GS 1826-24: A Probe of rp-Process Hydrogen Burning
Alexander Heger, Andrew Cumming, Duncan K. Galloway +1
The X-ray burster GS 1826-24 shows extremely regular Type I X-ray bursts whose energetics and recurrence times agree well with thermonuclear ignition models. We present calculation…
The Variable Warm Absorber in Circinus X-1
N. S. Schulz, T. E. Kallman, D. K. Galloway +1
We observed Circinus X-1 twice during a newly reached low-flux phase near zero orbital phase using the High-Energy Transmission Grating Spectrometer (HETGS) onboard Chandra. In bot…
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…
Evidence for a parsec scale X-ray jet from the accreting neutron star Circinus X-1
S. Heinz, N. S. Schulz, W. N. Brandt +1
We analyzed the zero-order image of a 50 ks Chandra gratings observation of Circinus X-1, taken in 2005 during the source's low-flux state. Circinus X-1 is an accreting neutron sta…
Pushing the limit on neutron star spin rates
Duncan K Galloway
Millisecond X-ray pulsars consist of a rapidly-spinning neutron star accreting from a low-mass stellar companion, and are the long-sought evolutionary progenitors of millisecond ra…
Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
Duncan K. Galloway, Michael P. Muno, Jacob M. Hartman +2
We have assembled a sample of 1187 thermonuclear (type-I) X-ray bursts from 48 accreting neutron stars by the Rossi X-ray Timing Explorer, spanning more than ten years. The sample…
Helium-rich thermonuclear bursts and the distance to the accretion-powered millisecond pulsar SAX J1808.4-3658
Duncan Galloway, Andrew Cumming
We analysed Rossi X-ray Timing Explorer observations of the accretion-powered 401 Hz pulsar SAX J1808.4-3658, in order to precisely determine the source distance. While the fluence…
Accretion-powered Millisecond Pulsar Outbursts
Duncan K. Galloway
The population of accretion-powered millisecond pulsars has grown rapidly over the last four years, with the discovery of six new examples to bring the total sample to seven. While…
Eddington-limited X-ray Bursts as Distance Indicators. II. Possible Compositional Effects in Bursts from 4U 1636-536
Duncan Galloway, Dimitrios Psaltis, Michael P. Muno +1
We analyzed 123 thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer from the low-mass X-ray binary 4U 1636-536. All but two of the 40 radius-exansion bu…
Discovery of a redshifted X-ray emission line in the symbiotic neutron star binary 4U 1700+24
A. Tiengo, D. K. Galloway, T. di Salvo +4
We present the spectral analysis of an XMM-Newton observation of the X-ray binary 4U 1700+24, performed during an outburst in August 2002. The EPIC-PN spectrum above 1 keV can be m…
Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence
P. G. Jonker, S. Campana, D. Steeghs +5
In this Paper we report on our analysis of three Chandra observations of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 obtained during the late stages of the 2004…
Discovery of the accretion-powered millisecond X-ray pulsar IGR J00291+5934
D. K. Galloway, C. B. Markwardt, E. H. Morgan +2
We report on observations of the sixth accretion-powered millisecond pulsar, IGR J00291+5934, with the Rossi X-Ray Timing Explorer. The source is a faint, recurrent X-ray transient…
Optical and X-ray observations of the neutron star soft X-ray transient XTE J1709-267
P. G. Jonker, D. K. Galloway, J. E. McClintock +3
We report on the discovery of the optical counterpart to the neutron star soft X-ray transient (SXT) XTE J1709-267 in outburst and quiescence. We further report the detection of ty…
An X-Ray Jet from a White Dwarf - Detection of the Collimated Outflow from CH Cygni with Chandra
D. K. Galloway, J. L. Sokoloski
Most symbiotic stars consist of a white dwarf accreting material from the wind of a red giant. An increasing number of these objects have been found to produce jets. Analysis of ar…
Thermonuclear burst physics with RXTE
D. K. Galloway, D. Chakrabarty, A. Cumming +3
Recently we have made measurements of thermonuclear burst energetics and recurrence times which are unprecedented in their precision, largely thanks to the sensitivity of the Rossi…
Periodic Thermonuclear X-ray Bursts from GS 1826-24 and the Fuel Composition as a Function of Accretion Rate
D. K. Galloway, A. Cumming, E. Kuulkers +3
We analyze 24 type I X-ray bursts from GS 1826-24 observed by the Rossi X-ray Timing Explorer between 1997 November and 2002 July. The bursts observed between 1997-98 were consiste…
The Effect of Neutron Star Rotation on the Properties of Thermonuclear X-ray Bursts
Michael P. Muno, Duncan K. Galloway, Deepto Chakrabarty +1
Previously, observations with the Rossi X-ray Timing Explorer showed that millisecond oscillations occur preferentially in thermonuclear X-ray bursts with photospheric radius expan…
X-ray observations of the compact central object in supernova remnant G347.3-0.5
J. Lazendic, P. Slane, B. Gaensler +4
We present Chandra, XMM-Newton and RXTE observations of 1WGA J1713.4-3949, a compact source at the center of the galactic supernova remnant (SNR) G347.3-0.5. The X-ray spectrum of…
Nuclear-Powered Millisecond Pulsars and the Maximum Spin Frequency of Neutron Stars
Deepto Chakrabarty, Edward H. Morgan, Michael P. Muno +4
Millisecond pulsars are neutron stars (NSs) that are thought to have been spun-up by mass accretion from a stellar companion. It is unknown whether there is a natural brake for thi…
X-ray Spectroscopy of the Accreting Millisecond Pulsar XTE J0929-314 in Outburst
Adrienne M. Juett, Duncan K. Galloway, Deepto Chakrabarty
We present the high-resolution spectrum of the accretion-powered millisecond pulsar XTE J0929-314 during its 2002 outburst, measured using the Low Energy Transmission Grating Spect…