SIMBAD references

XMM-Newton archival observations of the Be/X-ray binary candidate RX J0103.6-7201 revealed pulsations with a period of ∼1323 s. This makes RX J0103.6-7201 the X-ray pulsar with the longest period known in the Small Magellanic Cloud (SMC). More than 150 X-ray observations of RX J0103.6-7201 by ROSAT, Chandra and XMM-Newton show flux variations by a factor of 50 on time scales of days to years. Using the accurate positions obtained from ACIS-I images, the optical counterpart is identified as a V=14.6mag emission line star. EPIC spectra of RX J0103.6-7201 above 1 keV are consistent with an absorbed power-law with column density between (6-9)x10²¹cm^–2, except during one observation when an extraordinary high value of 1.1x10²³cm^–2 was measured which strongly attenuated the power-law emission below 3keV. A soft excess between 0.5 and 1.0keV is evident in the spectra which becomes best visible in the highly absorbed spectrum. The soft component can be reproduced by a thermal plasma emission model with its luminosity strongly correlated with the total intrinsic source luminosity. Including results from three other SMC Be/X-ray binaries extends the linear correlation over three orders of magnitude in source intensity, strongly suggesting that the same mechanism is responsible for the generation of the soft emission.