Kahabka, P., Haberl, F. , Pakull, M., Millar, W.C., White, G.L., Filipovic, M.D., and Payne, J.L. (2008) Faint super-soft x-ray sources in XMM-Newton large magellanic cloud fields. Astronomy & Astrophysics, 482 (1). pp. 237-245.

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Abstract

Aims. We report the discovery of three faint, super-soft X-ray sources in LMC fields observed with XMM-Newton.

Methods. We analyse the three new sources together with RX J0537.7-7034 and RX J0507.1-6743, both known since ROSAT.

Results. We identify XMMU J050803.1-684017 with the LMC planetary nebula LHA 120-N 102 = LMC SMP 29. The EPIC-pn spectrum of XMMU J050803.1-684017 can be fitted with a blackbody spectrum with an effective temperature of ~(26-51) eV and a bolometric luminosity of (0.1-30)×10³⁶ erg s⁻¹, depending on the assumed absorption. The source is consistent with the nucleus of a planetary nebula. The EPIC-pn spectrum of XMMU J052530.5-671501 is characterized by a blackbody temperature of ~(38-120) eV, a best-fit bolometric luminosity of ~3×10³⁷ erg s⁻¹ and absorbing LMC column of ~8⁺²(-8) 10²¹ cm⁻². This most likely highly-absorbed super-soft source resembles the LMC super-soft source CAL 87. The EPIC-pn spectrum of XMMU J052215.0-701658 yields a blackbody temperature of ~(24-83) eV, but there are only about 40 source counts and the spectral parameters of the source are not well constrained. We observe RX J0537.7-7034 with EPIC-pn to be about a factor of 15 fainter compared to the ROSAT observation 11 years earlier. RX J0507.1-6743 is observed as an absorbed super-soft source by XMM-Newton and the improved X-ray position coincides with a MACHO star which is consistent with a symbiotic star.

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