Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-12-06
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for A&A Letters on 22 Dec. 2011
Scientific paper
MAXI J1836-194 is a transient black-hole candidate discovered in outburst by MAXI on 30 August 2011. 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 of the X-ray flux, thus it entered again the low/hard state and began its return to quiescence.
Bozzo Enrico
Capitanio Fiamma
Del Santo Melania
Ferrigno Carlo
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