Carlo Ferrigno, Enrico Bozzo, Melania Del Santo, Fiamma Capitanio
MAXI J1836-194 is a transient black hole candidate discovered in outburst by
MAXI on 30 August 2011. In this letter, we report on the available INTEGRAL,
Swift, and RXTE observations performed in the direction of the source during
this event before 55 864 MJD. Combining the broad band (0.6-200 keV) spectral
and timing information obtained from these data with the results of radio
observations, we show that the event displayed by MAXI J1836-194 is another
example of "failed" outburst. During the first ~20 days after the onset of the
event, the source underwent a transition from the canonical low/hard to the
hard intermediate state, while reaching the highest X-ray flux. In the ~40 days
following the peak of the outburst, the source displayed a progressive spectral
hardening and a decrease in the X-ray flux, thus it entered again the low/hard
state and began its return to quiescence.
View original:
http://arxiv.org/abs/1112.1240
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