Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-26
Astron.Lett. 31 (2005) 258-262
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, accepted for publication in Astronomy Letters
Scientific paper
10.1134/1.1896069
We obtain photometric constraints on the luminosity of the stellar remnant in SNR1987A using XMM-Newton and INTEGRAL data. The upper limit in the 2--10 keV band based on the XMM-Newton data is L<5*10^{34}erg/s. We note, however, that the optical depth of the envelope is still high in the XMM-Newton band, therefore, this upper limit does not constrain the true unabsorbed luminosity of the central source. The optical depth is expected to be small in the hard X-ray band of the IBIS telescope aboard the INTEGRAL observatory, therefore it provides an unobscured look at the stellar remnant. We did not detect statistically significant emission from SN1987A in the 20-60 keV band with the upper limit of L<1.1*10^{36}erg/s. We also obtained an upper limit on the mass of radioactive 44Ti M(44Ti)<10^{-3}Msun.
Gilfanov Marat
Lutovinov Alexander A.
Shtykovskiy Pavel
Sunyaev Rachid
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