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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29641
Title: The 2015 outburst of the accretion-powered pulsar IGR J00291+5934: INTEGRAL and Swift observations
Authors: De Falco, V.
Kuiper, L.
Bozzo, E.
Galloway, D. K.
Poutanen, J.
Ferrigno, C.
STELLA, Luigi 
Falanga, M.
Issue Date: 2017
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 599
First Page: A88
Abstract: 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 25 d. 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 (0.1-250 keV) persistent spectrum in 2015 is well described by a thermal Comptonization model with a column density of N<SUB>H</SUB> ≈ 4 × 10<SUP>21</SUP> cm<SUP>-2</SUP>, a plasma temperature of kT<SUB>e</SUB> ≈ 50 keV, and a Thomson optical depth of τ<SUB>T</SUB> ≈ 1. Pulsations at the known spin period of the source are detected in the INTEGRAL data up to the 150 keV 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 y<SUB>ign</SUB> ≈ 1.5 × 10<SUP>9</SUP> g cm<SUP>-2</SUP> following the exhaustion by steady burning of the accreted hydrogen. The Swift/BAT data from the first 20 s 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 ± 0.5 kpc.
URI: http://hdl.handle.net/20.500.12386/29641
URL: https://www.aanda.org/articles/aa/abs/2017/03/aa29575-16/aa29575-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201629575
Bibcode ADS: 2017A&A...599A..88D
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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