naa a22 4500 510789897 CHVBK 20180411083316.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1134/S1063773713060054 doi (NATIONALLICENCE)springer-10.1134/S1063773713060054 Second outburst of the black hole candidate MAXI J1836-194 from SWIFT and INTEGRAL observations [Elektronische Daten] [S. Grebenev, A. Prosvetov, R. Sunyaev] 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). Pleiades Publishing, Ltd., 2013 X-ray sources nationallicence transients nationallicence black holes nationallicence Grebenev S. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Prosvetov A. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Sunyaev R. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut Astronomy Letters SP MAIK Nauka/Interperiodica 39/6(2013-06-01), 367-374 1063-7737 39:6<367 2013 39 11443 https://doi.org/10.1134/S1063773713060054 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063773713060054 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grebenev S. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Prosvetov A. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 700 1- Sunyaev R. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Letters SP MAIK Nauka/Interperiodica 39/6(2013-06-01), 367-374 1063-7737 39:6<367 2013 39 11443 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer