2017A&A...599A..88D


Query : 2017A&A...599A..88D

2017A&A...599A..88D - Astronomy and Astrophysics, volume 599A, 88-88 (2017/3-1)

The 2015 outburst of the accretion-powered pulsar IGR J00291+5934: INTEGRAL and Swift observations.

DE FALCO V., KUIPER L., BOZZO E., GALLOWAY D.K., POUTANEN J., FERRIGNO C., STELLA L. and FALANGA M.

Abstract (from CDS):

The pulsar IGR J00291+5934 is the fastest-known accretion-powered X-ray pulsar, discovered during a transient outburst in 2004. In this paper, we report on INTEGRAL and Swift observations during the 2015 outburst, which lasts for ∼25d. The source has not been observed in outburst since 2008, suggesting that the long-term accretion rate has decreased by a factor of two since discovery. The averaged broad-band (0.1-250keV) persistent spectrum in 2015 is well described by a thermal Comptonization model with a column density of NH~=4x1021cm–2, a plasma temperature of kTe~=50keV, and a Thomson optical depth of τT~=1. Pulsations at the known spin period of the source are detected in the INTEGRAL data up to the ∼150keV energy band. We also report on the discovery of the first thermonuclear burst observed from IGR J00291+5934, which lasts around 7 min and occurs at a persistent emission level corresponding to roughly 1.6% of the Eddington accretion rate. The properties of the burst suggest it is powered primarily by helium ignited at a depth of yign~=1.5x109g/cm2 following the exhaustion by steady burning of the accreted hydrogen. The Swift/BAT data from the first ∼20s of the burst provide indications of a photospheric radius expansion phase. Assuming this is the case, we infer a source distance of d=4.2±0.5kpc.

Abstract Copyright: © ESO, 2017

Journal keyword(s): pulsars: individual: IGR J00291+5934 - stars: neutron - X-rays: binaries - X-rays: bursts - X-rays: bursts

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V709 Cas CV* 00 28 48.8268573576 +59 17 22.032796585     14.01     ~ 115 0
2 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 243 1
3 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 335 0
4 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 903 0
5 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 192 0

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2021.10.23-03:28:17

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