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FERMI OBSERVATIONS OF TeV-SELECTED ACTIVE GALACTIC NUCLEI
Vise andre og tillknytning
2009 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, nr 2, s. 1310-1333Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We report on observations of TeV-selected active galactic nuclei (AGNs) made during the first 5.5 months of observations with the Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope (Fermi). In total, 96 AGNs were selected for study, each being either (1) a source detected at TeV energies (28 sources) or (2) an object that has been studied with TeV instruments and for which an upper limit has been reported (68 objects). The Fermi observations show clear detections of 38 of these TeV-selected objects, of which 21 are joint GeV-TeV sources, and 29 were not in the third EGRET catalog. For each of the 38 Fermi-detected sources, spectra and light curves are presented. Most can be described with a power law of spectral index harder than 2.0, with a spectral break generally required to accommodate the TeV measurements. Based on an extrapolation of the Fermi spectrum, we identify sources, not previously detected at TeV energies, which are promising targets for TeV instruments. Evidence for systematic evolution of the gamma-ray spectrum with redshift is presented and discussed in the context of interaction with the extragalactic background light.

sted, utgiver, år, opplag, sider
2009. Vol. 707, nr 2, s. 1310-1333
HSV kategori
Forskningsprogram
Naturvetenskap, Fysik
Identifikatorer
URN: urn:nbn:se:hik:diva-2813DOI: 10.1088/0004-637X/707/2/1310ISI: 000272465400039OAI: oai:DiVA.org:hik-2813DiVA, id: diva2:299620
Tilgjengelig fra: 2010-02-23 Laget: 2010-02-23 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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