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VERSION:2.0
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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20131113T103000
DTEND;TZID=Atlantic/Canary:20131113T113000
UID:iactalks-548
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/548
CREATED:2013-11-13T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Title: SAUSAGE & TOOTHBRUSH galaxy clusters: Spectral and morpholog
 ical signatures of cluster merger shocks 
DESCRIPTION:Title: SAUSAGE & TOOTHBRUSH galaxy clusters: Spectral and morph
 ological signatures of cluster merger shocks \nMiss Andra Stroe\n\nCluster
 s grow by mergers, events which release huge quantities of  energy and can
  produce massive outward-travelling shock waves that can  have an importan
 t effect on cluster gas and galaxies. Giant radio relics  form at these sh
 ock fronts, where accelerated electrons emit  synchrotron radiation. Despi
 te the great interest in relics, candidates  with simple geometry, undistu
 rbed morphology and high surface brightness  are scarce. The complex inter
 action between the merger, the shock wave  and gas is likely a fundamental
  driver of galaxy evolution. The effects  of dense environments have been 
 previously investigated for relaxed  clusters, but never before in highly 
 disturbed, merging clusters hosting  a relic. The Sausage and the Toothbru
 sh clusters are providing us with  the chance to study this phenomenon and
  its effects on the relativistic  particles and the cluster galaxies. In o
 rder to address many of the  unanswered questions, we use a unique combina
 tion of facilities (GMRT,  WSRT, INT) to obtain the first cluster-wide, mu
 lti-wavelength,  multi-method analysis aimed at giving a complete picture 
 of merging  clusters hosting relics. We derive physical parameters such as
  the Mach  number and injection spectral index for the diffuse sources in 
 the  field. We present index and curvature maps pinpointing spectral trend
 s  conclusive for shock acceleration of relativistic particles and test  i
 njection models such as the Jaffe-Perola and Kardashev-Pacholczyk. This  a
 nalysis is fully complemented by an Halpha mapping of the cluster  volume 
 and outskirts. We provide the first direct test whether the shock  drives 
 or prohibits star formation to decipher the role of the merger  in shaping
  the Halpha luminosity function.
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