2017MNRAS.466.3450F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST05:50:44

2017MNRAS.466.3450F - Mon. Not. R. Astron. Soc., 466, 3450-3459 (2017/April-2)

Discovery of a soft X-ray 8 mHz QPO from the accreting millisecond pulsar IGR J00291+5934.

FERRIGNO C., BOZZO E., SANNA A., PINTORE F., PAPITTO A., RIGGIO A., BURDERI L., DI SALVO T., IARIA R. and D'AI A.

Abstract (from CDS):

We report on the analysis of the peculiar X-ray variability displayed by the accreting millisecond X-ray pulsar IGR J00291+5934 in a 80 ks-long joint NuSTAR and XMM-Newton observation performed during the source outburst in 2015. The light curve of the source is characterized by a flaring-like behaviour, with typical rise and decay time-scales of ∼120 s. The flares are accompanied by a remarkable spectral variability, with the X-ray emission being generally softer at the peak of the flares. A strong quasi-periodic oscillation (QPO) is detected at ∼8 mHz in the power spectrum of the source and clearly associated with the flaring-like behaviour. This feature has the strongest power at soft X-rays ( <= 3 keV). We carried out a dedicated hardness-ratio-resolved spectral analysis and a QPO phase-resolved spectral analysis, together with an in-depth study of the source-timing properties, to investigate the origin of this behaviour. We suggest that the unusual variability of IGR J00291+5934 observed by XMM-Newton and NuSTAR could be produced by a heartbeat-like mechanism, similar to that observed in black hole X-ray binaries. The possibility that this variability, and the associated QPO, are triggered by phases of quasi-stable nuclear burning, as sustained in the literature for a number of other neutron star binaries displaying a similar behaviour, cannot be solidly tested in the case of IGR J00291+5934 due to the paucity of type I X-ray bursts detected from this source.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME IC 10 X-1 HXB 00 20 29.09 +59 16 51.9           ~ 148 0
2 V* V1037 Cas LXB 00 29 03.06 +59 34 19.0           ~ 231 1
3 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 827 1
4 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 786 1
5 [KRL2007b] 222 LXB 17 09 07.61 -36 24 25.7           ~ 209 1
6 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 597 0
7 IGR J17480-2446 LXB 17 48 04.831 -24 46 48.87           ~ 150 0
8 [HAC2010] NGC 6440 X-2 LXB 17 48 52.76 -20 21 24.0           ~ 63 0
9 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 870 0
10 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1011 1
11 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2281 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-05:50:44

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