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SUMMARY:Observations of 1ES 1101-232 with H.E.S.S. and at lower frequencie
 s:  A hard spectrum blazar and constraints on the extragalactic background
  light
DTSTART;VALUE=DATE-TIME:20070709T161800Z
DTEND;VALUE=DATE-TIME:20070709T163000Z
DTSTAMP;VALUE=DATE-TIME:20260413T133243Z
UID:indico-contribution-555@cern.ch
DESCRIPTION:Speakers: Dr. PUEHLHOFER\, Gerd (Landessternwarte Heidelberg)\
 nVHE observations of the distant (z=0.186) blazar 1ES 1101-232 with H.E.S.
 S. are used\nto constrain the extragalactic background light (EBL) in the 
 optical to near infrared\nband. As the EBL traces the galaxy formation his
 tory of the universe\, galaxy\nevolution models can therefore be tested wi
 th the data. In order to measure the EBL\nabsorption effect on a blazar sp
 ectrum\, we assume that usual constraints on the\nhardness of the intrinsi
 c blazar spectrum are not violated. We present an update of\nthe VHE spect
 rum obtained with H.E.S.S. and the multifrequency data that were taken\nsi
 multaneously with the H.E.S.S. measurements. The data verify that the broa
 dband\ncharacteristics of 1ES 1101-232 are similar to those of other\, mor
 e nearby blazars\,\nand strengthen the assumptions that were used to deriv
 e the EBL upper limit.\n\nhttps://indico.nucleares.unam.mx/event/4/session
 /97/contribution/555
LOCATION:Merida\, Mexico Uxmal + Tulum (Holiday Inn)
URL:https://indico.nucleares.unam.mx/event/4/session/97/contribution/555
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