2008A&A...484..451H


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST18:13:00

2008A&A...484..451H - Astronomy and Astrophysics, volume 484, 451-455 (2008/6-3)

XMM-Newton observations of the Small Magellanic Cloud: X-ray outburst of the 6.85 s pulsar XTEJ0103-728.

HABERL F. and PIETSCH W.

Abstract (from CDS):

A bright X-ray transient was seen during an XMM-Newton observation in the direction of the Small Magellanic Cloud (SMC) in October 2006. The data from the European Photon Imaging Cameras (EPIC) allow us to accurately locate the source and to investigate its temporal and spectral behaviour. We extracted X-ray spectra covering 0.2-10keV and pulse profiles in different energy bands from the EPIC data. The detection of 6.85s pulsations in the EPIC-PN data unambiguously identifies the transient with XTEJ0103-728, discovered as 6.85s pulsar by the Rossi X-ray Timing Explorer. The X-ray light curve during the XMM-Newton observation shows flaring activity of the source with intensity changes by a factor of two within 10min. Modelling of pulse-phase averaged spectra with a simple absorbed powerlaw indicates systematic residuals, which can be accounted for by a second emission component. From a model implying blackbody emission due to reprocessing by optically-thick material in the inner accretion disk, we estimate the inner disk radius to ∼160km. The photon index of the powerlaw of ∼0.4 indicates a relatively hard spectrum. The 0.2-10keV luminosity was 2x1037erg/s with a contribution of ∼3% from the disk-blackbody component. A likely origin for the excess emission is reprocessing of hard X-rays from the neutron star by optically-thick material near the inner edge of an accretion disk. From a timing analysis we determine the pulse period to 6.85401(1)s, indicating an average spin-down of ∼0.0017s per year since the discovery of XTEJ0103-728 in May 2003. The X-ray properties and the identification with a Be star confirm XTEJ0103-728 as Be/X-ray binary transient in the SMC.

Abstract Copyright:

Journal keyword(s): Galaxy: stellar content - stars: emission-line, Be - stars: neutron - X-rays: binaries - galaxies: Magellanic Clouds

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9042 1
2 SXP 6.85 HXB 01 02 53.3181214914 -72 44 35.166325803   14.51 14.59     O9.5-B0IV-V 54 0
3 [MA93] 1393 HXB 01 03 37.5346803264 -72 01 33.205470837   14.54 14.65     B0III-V 51 0
4 RX J0103.8-7254 X 01 03 53.5 -72 54 48           ~ 7 0
5 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 781 0
6 EM* GGA 104 HXB 01 47 00.2121223849 +61 21 23.661992704 11.76 12.09 11.366 11.00 10.52 B1IIIe 167 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5339 1

    Equat.    Gal    SGal    Ecl

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2019.09.21-18:13:00

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