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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20101020T000000
DTEND;TZID=Atlantic/Canary:20101020T010000
UID:iactalks-219
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/219
CREATED:2010-10-20T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Magnetic fields and the outer rotation curve of M31
DESCRIPTION:Magnetic fields and the outer rotation curve of M31\nDr. Beatri
 z Ruiz Granados\n\nRecent observations of the rotation curve of M31 show a
  rise of the outer part that cannot be understood in terms of standard dar
 k matter models or perturbations of the galactic disc by M31's satellites.
  In this talk, we show a possible explanation of this dynamical feature ba
 sed on the influence of the magnetic field within the thin disc.  We have 
 considered standard mass models for the luminous mass  distribution, a Nav
 arro-Frenk-White model to describe the dark halo, and we have added up the
  contribution to the rotation curve of a magnetic field  in the disc.  We 
 have found a significant improvement of the fit in the outer part when mag
 netic effects are considered. Our best-fit requires a field strength of ~ 
 4μG which is compatible with the observations of the magnetic fields in
  M31.
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