2022A&A...661A..20C


Query : 2022A&A...661A..20C

2022A&A...661A..20C - Astronomy and Astrophysics, volume 661A, 20-20 (2022/5-1)

SRG/eROSITA discovery of 164 s pulsations from the SMC Be/X-ray binary XMMU J010429.4-723136.

CARPANO S., HABERL F., MAITRA C., FREYBERG M., DENNERL K., SCHWOPE A., BUCKLEY A.H. and MONAGENG I.M.

Abstract (from CDS):


Context. The Small Magellanic Cloud (SMC) hosts many known high-mass X-ray binaries (HMXBs), and all but one (SMC X-1) have a Be companion star. Through the calibration and verification phase of eROSITA on board the Spektrum-Roentgen-Gamma (SRG) spacecraft, the Be/X-ray binary XMMU J010429.4-723136 was in the field of view during observations of the supernova remnant, 1E0102.2-7219, used as a calibration standard.
Aims. We report timing and spectral analyses of XMMU J010429.4-723136 based on three eROSITA observations of the field, two of which were performed on 2019 November 7-9, with the third on 2020 June 18-19. We also reanalyse the OGLE-IV light curve for that source in order to determine the orbital period.
Methods. We performed a Lomb-Scargle periodogram analysis to search for pulsations (from the X-ray data) and for the orbital period (from the OGLE data). X-ray spectral parameters and fluxes were retrieved from the best-fit model.
Results. We detect, for the first time, the pulsations of XMMU J010429.4-723136 at a period of -164 s, and therefore designate the source as SXP 164. From the spectral fitting, we derive a source flux of ∼1 x 10–12 erg s–1 cm–2 for all three observations, corresponding to a luminosity of ∼4 x 1035 erg s–1 at the distance of the SMC. Furthermore, reanalysing the OGLE light curve, including the latest observations, we find a significant periodic signal that we believe is likely be the orbital period; at 22.3 days, this is shorter than the previously reported values. The Swift/XRT light curve, extracted from two long monitorings of the field and folded at the same period, suggests that a modulation is also present in the X-ray data.

Abstract Copyright: © S. Carpano et al. 2022

Journal keyword(s): galaxies: individual: Small Magellanic Could - stars: neutron - X-rays: binaries - X-rays: individuals: SXP 164 - stars: emission-line, Be

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 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10314 1
2 [MA93] 1393 HXB 01 03 37.5349856136 -72 01 33.204096336   14.54 14.65     B0III-V 64 0
3 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 375 1
4 [M2002] SMC 59367 HXB 01 04 29.419 -72 31 36.54 14.52 15.38 15.45 15.51   B1V 11 0
5 NAME XTE POSITION B HXB 01 05 00.00 -72 06 21.6           ~ 4 0
6 SXP 65.8 HXB 01 07 12.6098206008 -72 35 33.884245680 14.72 15.52 15.64 15.5 15.73 B1-B1.5II-III 23 0
7 SK 160 HXB 01 17 05.1457288392 -73 26 36.014808156 12.23 13.00 13.15   13.17 O9.7Ia+ 827 0

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2022.08.09-16:13:12

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