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Chandra and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934

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Paizis, A., Nowak, M. A. (Mike A.), Wilms, J. (Joern), Courvoisier, T., 1953-, Ebisawa, K., Rodriguez, J. (Jerome) and Ubertini, P.. (2005) Chandra and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934. Astronomy & Astrophysics, Vol.444 (No.2). pp. 357-363. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20053419

Abstract

We report on an observation of the recently discovered accreting millisecond X-ray pulsar IGR J00291+5934 performed with the RXTE-Proportional Counter Array (PCA) and Chandra-High Energy Transmission Grating Spectrometer (HETGS). The RXTE data are from a twoweek follow-up of the source, while the Chandra observation took place around the end of the follow-up, about 12 days after the discovery of the source, when the source flux had decreased already by a factor of ten. The analysis of the Chandra data allowed us to extract the most precise X-ray position of IGR J00291+5934, RA = 00h 29m 03.08s, and Dec =+59◦ 34 19.2 (0.6 error), compatible with the optical and radio ones. We find that the spectra of IGR J00291+5934 can be described by a combination of a thermal component and a power-law. Along the outburst detected by PCA, the power-law photon index showed no particular trend, while the thermal component (∼1 keV, interpreted as a hot spot on the neutron star surface) became weaker until non-detection. In the simultaneous observation of the weak Chandra /RXTE spectrum, there was no longer any indication of the ∼1 keV thermal component, while we detected a colder thermal component (∼0.4 keV) that we interpret as the emission from the cold disc. A hint of a 6.4 keV iron line was detected, together with an excess around 6.8 keV and absorption feature around 7.1 keV. The last two features have never been detected in the spectra of accretion-driven millisecond pulsars before and, if confirmed, would suggest the presence of an expanding hot corona with high outflow velocities.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray sources, Galactic, Double stars, Pulsars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	December 2005
Volume:	Vol.444
Number:	No.2
Page Range:	pp. 357-363
Identification Number:	10.1051/0004-6361:20053419
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Agenzia spaziale italiana [Italian Space Agency] (ASI), United States. National Aeronautics and Space Administration (NASA)
Grant number:	ASI-I/R/046/04 (ASI), SV3-73016 (NASA), GO4-5049X (NASA)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3574