A new upper limit on the redshift of PG 1553+113 from observations with the MAGIC Telescope

Very high energy gamma ray emission from the active galactic nucleus PG 1553+113 was observed during 2005 and 2006 by the MAGIC collaboration, for a total observation time of 18.8 hours. Here we present the results of follow up observations: more than 20 hours of good quality data collected by the M...

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Bibliographic Details
Published inarXiv.org
Main Authors Prandini, Elisa, Dorner, Daniela, Mankuzhiyil, Nijil, Mariotti, Mosè, Mazin, Daniel, the MAGIC Collaboration
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 01.07.2009
Subjects
Active galactic nuclei
Gamma rays
Red shift
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Summary:Very high energy gamma ray emission from the active galactic nucleus PG 1553+113 was observed during 2005 and 2006 by the MAGIC collaboration, for a total observation time of 18.8 hours. Here we present the results of follow up observations: more than 20 hours of good quality data collected by the MAGIC Telescope during the 2007 and 2008 campaigns. The obtained spectra are compared and combined with previous measurements, and corrected for absorption adopting different EBL models. Upper limits on the unknown source redshift are derived by assuming the absence of a break in the intrinsic spectrum, or alternatively by constraining the hardness of the intrinsic source spectrum.
ISSN:2331-8422