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Second outburst of the black hole candidate MAXI J1836-194 from SWIFT and INTEGRAL observations

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Abstract

Details of the observations of a new (second) outburst of the X-ray transientMAXI J1836-194 discovered late in August 2011, a suspected black hole in a low-mass binary system, with the instruments of the SWIFT and INTEGRAL orbiting observatories are presented. The outburst was weaker than the first one; the source had a power-law spectrum in a wide X-ray (0.3–400 keV) energy range without any clear evidence for the presence of a soft (blackbody) component related to the emission from the outer accretion disk regions. This shows that the outburst was a “failed” one: the source did not pass through the sequence of spectral states characteristic of X-ray novae. The observed optical emission from the source whose variability was strongly correlated with its X-ray variability seems to have also been an extension of the power-law spectrum. Spectrum uniformity is, on the whole, unusual for other sources containing a black hole and raises the question about the nature of the emission from MAXI J1836-194 (disk or jet).

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Correspondence to S. A. Grebenev.

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Original Russian Text © S.A. Grebenev, A.V. Prosvetov, R.A. Sunyaev, 2013, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2013, Vol. 39, No. 6, pp. 415–422.

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Grebenev, S.A., Prosvetov, A.V. & Sunyaev, R.A. Second outburst of the black hole candidate MAXI J1836-194 from SWIFT and INTEGRAL observations. Astron. Lett. 39, 367–374 (2013). https://doi.org/10.1134/S1063773713060054

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  • DOI: https://doi.org/10.1134/S1063773713060054

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