Query : 2018A&A...619A.126L

2018A&A...619A.126L - Astronomy and Astrophysics, volume 619A, 126-126 (2018/11-1)

Spectral analysis of SXP59.0 during its 2017 outburst and properties of the soft excess in X-ray binary pulsars.


Abstract (from CDS):

We report the results provided by the XMM-Newton observation of the X-ray binary pulsar SXP59.0 during its most recent outburst in April 2017. The source was detected at fX(0.2-12keV)=8x10–11erg/cm2/s, one of its highest flux levels reported to date. The measured pulse period was Pspin=58.949(1) s, very similar to the periods measured in most of the previous observations. The pulsed emission was clearly detected over the whole energy range between 0.2 and 12keV, but the pulse profile is energy dependent and the pulsed fraction increases as the energy increases. Although the time-averaged EPIC spectrum is dominated by a power-law component (with photon index Γ=0.76±0.01), the data show an evident soft excess, which can be described with the sum of a black-body and a hotthermal plasma component (with temperatures kTBB=171+11–14eV and kTAPEC=1.09+0.16–0.09keV, respectively). Moreover, the EPIC and RGS spectra show narrow emission lines due to N, O, Ne, Mg, and Fe.The phase-resolved spectral analysis of the EPIC data shows that the flux of the black-body component varies with the pulse phase, while the plasma component is almost constant. We show that the black-body component can be attributed to the reprocessing of the primary emission by the optically thick material at the inner edge of the accretion disc, while the hot plasma component is due to a diffuse gas far from the accretion region and the narrow emission lines of the RGS spectrum are most probably due to photoionized matter around the accreting source.

Abstract Copyright: © ESO 2018

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: binaries - pulsars: individual: SXP59.0 - X-rays: general - stars: individual: [MA93] 810

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10309 1
2 X SMC X-2 HXB 00 54 33.43 -73 41 01.3 13.77 16.40 16.38   14.67 O9.5III-V 119 0
3 [MA93] 810 HXB 00 54 56.1754603176 -72 26 47.859057060 14.17 15.24 15.28   15.11 O9V 70 0
4 RX J0059.2-7138 HXB 00 59 12.7444006824 -71 38 44.962383408   14.07 14.01 14.36   B1-B1.5II-III 81 0
5 IGR J01572-7259 HXB 01 57 16.2115944744 -72 58 32.493128592   15.5   15.5   ~ 18 0

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