Volume 563, March 2014
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||20 March 2014|
INTEGRAL and Swift observations of the hard X-ray transient MAXI J1828-249
ISDC, University of Geneva,
Ch. d’Ecogia 16,
2 Space Research Institute, 117997 Moscow, Russia
Received: 25 December 2013
Accepted: 16 February 2014
In this paper we report on the observations performed with INTEGRAL and Swift of the first outburst detected from the hard X-ray transient MAXI J1828-249. During the first about two days of the outburst, the source was observed by MAXI to undergo a very rapid transition from a hard to a softer spectral state. While the hard state was not efficiently monitored because the transition occurred so rapidly, the evolution of the source outburst in the softer state was covered quasi-simultaneously in a broad energy range (0.6−150 keV) by the instruments on board INTEGRAL and Swift. During these observations, the spectra measured from the source displayed both a prominent thermal emission with temperature kT ~ 0.7 keV and a power-law hard component with a photon index Γ ~ 2.2 extending to 200 keV. The properties of the source in the X-ray domain are reminiscent of those displayed by black hole transients during the soft intermediate state, which supports the association of MAXI J1828-249 with this class of objects.
Key words: X-rays: binaries / X-rays: bursts / accretion, accretion disks / black hole physics
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.