Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-03-10
Astrophys.J.697:934-941,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
8 pages, 5 figures, 2 tables. Accepted for publication on ApJ Main Journal
Scientific paper
10.1088/0004-637X/697/1/934
We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy gamma-ray (GeV) emission from the flat-spectrum radio quasar PKS 1454-354 (z=1.424). On 4 September 2008 the source rose to a peak flux of (3.5 +/- 0.7)x 10^-6 ph cm^-2 s^-1 (E > 100 MeV) on a time scale of hours and then slowly dropped over the following two days. No significant spectral changes occurred during the flare. Fermi/LAT observations also showed that PKS 1454-354 is the most probable counterpart of the unidentified EGRET source 3EG J1500-3509. Multiwavelength measurements performed during the following days (7 September with Swift; 6-7 September with the ground-based optical telescope ATOM; 13 September with the Australia Telescope Compact Array) resulted in radio, optical, UV and X-ray fluxes greater than archival data, confirming the activity of PKS 1454-354.
Abdo The Fermi/LAT Collaboration: A. A.
Burrows David N.
Chester McMath M.
Edwards Philip G.
Hauser Marcus
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