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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130306T123000
DTEND;TZID=Atlantic/Canary:20130306T133000
UID:iactalks-473
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/473
CREATED:2013-03-06T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:A black hole in Swift J1357.2-0933 obscured by an inner disc torus 
DESCRIPTION:A black hole in Swift J1357.2-0933 obscured by an inner disc to
 rus \nDr. Jesús Corral Santana\n\nX-ray transients are binary systems com
 posed by a 'normal' star  which is transfering mass onto a compact object 
 (either a black hole  or a neutron star) through Roche lobe overflow. Thes
 e systems show  sporadic outburst episodes and long quiescence states, bei
 ng   ideal systems to search for stellar-mass black holes. Different studi
 es predict  a Galactic population of ~10^3-10^4 X-ray transients, however,
  there are  only 18 stellar-mass black holes dynamically confirmed (and ot
 her ~32 candidates whichc share similar timing and spectral properties).\n
 In this talk I'll present the case of Swift J1357.2-0933, a new X-ray tran
 sient discovered  in 2011. Our analysis shows that Swift J1357.2-0933 is t
 he first black hole transient seen  at a large inclination (>75º).
  High time resolution lightcurves  show dips or eclipses produced by a ver
 tical structure present in the  inner accretion rather than the companion 
 star. Some dips display    up to ~50% reduction of flux in ~2min (~30% red
 uction of flux in 7s).  Moreover, the dips present a recurrence period of 
 a few minutes which increases  with time. This can only be explained by th
 e expansion of the obscuring structure outward  in the accretion.  Swift J
 1357.2-0933 could be the prototype of an hytherto Galactic population  of 
 black hole transients with large inclinations.
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