Study of possible gamma-ray emission from some starburst galaxies

CILLIS, ANALIA N.; TORRES, DIEGO F.

Otro; Fermi Collaboration EVO Meeting; 2010

We studied the possible gamma emission from the starburst galaxies M82, NGC253, NGC4945, NGC1068, M51, Arp220, in an energy range of 100 MeV -100000 MeV. The time range was 2008-08-04T15:43:36.0000 - 2010-03-10T04:17:34.0000. We utilized the Science Tools Version: v9r15p2 (the same used in the First Catalog). We included in the background all the sources of the First Catalog 10 degrees around the source in study. For the likelihood analysis we fixed all the variables in the source model as in the First Catalog for sources that are more than 5 degrees from the source in study. For the sources closer than that the variables were set to free. The results for the gamma emission at the position of NGC4945 and NGC1068 are encouraging. We could not find gamma emission from region around Arp220.