Query : 2005A&A...444..357P

2005A&A...444..357P - Astronomy and Astrophysics, volume 444, 357-363 (2005/12-3)

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


Abstract (from CDS):

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 two-week 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=00h29m03.08s, 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 (∼1keV, 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 ∼1keV thermal component, while we detected a colder thermal component (∼0.4keV) that we interpret as the emission from the cold disc. A hint of a 6.4keV iron line was detected, together with an excess around 6.8keV and absorption feature around 7.1keV. 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.

Abstract Copyright:

Journal keyword(s): pulsars: individual: IGR J00291+5934

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* V709 Cas CV* 00 28 48.8267393856 +59 17 22.033767228     14.01     ~ 117 0
2 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 248 1
3 V* BW Ant LXB 09 29 20.19 -31 23 03.2   18.50 18.63     ~ 181 0
4 [KRL2007b] 291 LXB 17 51 13.49 -30 37 23.4           ~ 239 0
5 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 918 0
6 2MAXI J1900-248 LXB 19 00 08.65 -24 55 13.7     18.09     ~ 196 0

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