A Chandra observation of the millisecond X-ray pulsar IGR J17511-3057

Abstract

IGR J17511-3057 is a low mass X-ray binary hosting a neutron star and is one of the few accreting millisecond X-ray pulsars with X-ray bursts. We report on a 20ksec Chandra grating observation of IGR J17511-3057, performed on 2009 September 22. We determine the most accurate X-ray position of IGR J17511-3057, alpha(J2000) = 17h 51m 08.66s, delta(J2000) = -30deg 57' 41.0" (90% uncertainty of 0.6"). During the observation, a ~54sec long type-I X-ray burst is detected. The persistent (non-burst) emission has an absorbed 0.5-8keV luminosity of 1.7 x 10^36 erg/sec (at 6.9kpc) and can be well described by a thermal Comptonization model of soft, ~0.6keV, seed photons up-scattered by a hot corona. The type-I X-ray burst spectrum, with average luminosity over the 54sec duration L(0.5-8keV)=1.6 x 10^37 erg/sec, can be well described by a blackbody with kT_(bb)~1.6keV and R_(bb)~5km. While an evolution in temperature of the blackbody can be appreciated throughout the burst (average peak kT_(bb)=2.5(+0.8/-0.4)keV to tail kT_(bb)=1.3(+0.2/-0.1)keV), the relative emitting surface shows no evolution. The overall persistent and type-I burst properties observed during the Chandra observation are consistent with what was previously reported during the 2009 outburst of IGR J17511-3057.

6 pages, 4 figures, accepted for publication in ApJ (2012-06-08)

References in corpus (15)

• A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)
• Discovery of coherent millisecond X-ray pulsations in Aql X-1
• Intermittent millisecond X-ray pulsations from the neutron-star X-ray transient SAX J1748.9-2021 in the globular cluster NGC 6440
• The Accreting Millisecond X-ray Pulsar IGR J00291+5934: Evidence for a Long Timescale Spin Evolution
• Chandra X-ray spectroscopy of the focused wind in the Cygnus X-1 system. I. The non-dip spectrum in the low/hard state
• Two Years of INTEGRAL monitoring of GRS 1915+105 Part 2: X-Ray Spectro-Temporal Analysis
• The X-ray spectrum of the newly discovered accreting millisecond pulsar IGR J17511-3057
• Disk Dominated States of 4U 1957+11: Chandra, XMM, and RXTE Observations of Ostensibly the Most Rapidly Spinning Galactic Black Hole
• Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057
• Radius-expansion burst spectra from 4U 1728-34: an ultracompact binary?
• Timing of the accreting millisecond pulsar IGR~J17511--3057
• The discovery of the 401 Hz accreting millisecond pulsar IGR J17498-2921 in a 3.8 hr orbit
• Statistical Characterization of the Chandra Source Catalog
• The 2009 outburst of accreting millisecond pulsar IGR J17511-3057 as observed by SWIFT and RXTE
• Possible twin kHz Quasi Periodic Oscillations in the accreting millisecond X-ray Pulsar IGR J17511-3057

Cited by in corpus (9)

• The Multi-INstrument Burst ARchive (MINBAR)
• The magnetic field strengths of accreting millisecond pulsars
• A bright thermonuclear X-ray burst simultaneously observed with Chandra and RXTE
• Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data
• Chandra Observations of Eight Sources Discovered by INTEGRAL
• Population Synthesis of Millisecond X-ray Pulsars
• The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift and XMM-Newton
• Chandra Identification of Two AGN Discovered by INTEGRAL
• Detection of low-luminosity X-ray pulsations from the accreting millisecond pulsar IGR J17511-3057: An ever-thinning thread between bright accretion and sub-luminous states