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- Fermi/LAT discovery of gamma-ray emission from the flat-spectrum radio quasar PKS 1454-354 doi link

Author(s): Abdo A.A., Ackermann M., B. Atwood W., Axelsson M., Baldini L., Ballet J., Barbiellini G., Bastieri D., Bogaert G., Bruel P., M. Casandjian J., Cohen-Tanugi J., Dumora D., Farnier C., Fleury P., Giebels B., A. Grenier I., Grondin M.-H., Guillemot L., Guiriec Sylvain, Kn¨odlseder J., Lemoine-Goumard M., Lott B., Nuss E., Parent D., Piron F., Reposeur T., Sanchez D., A. Smith D., Vilchez N.

(Article) Published: The Astrophysical Journal / The Astrophysical Journal Letters, vol. 697 p.934-941 (2009)
Links openAccess full text : arxiv


Ref HAL: in2p3-00378187_v1
Ref Arxiv: 0903.1713
DOI: 10.1088/0004-637X/697/1/934
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
29 citations
Abstract:

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.



Comments: 8 pages, 5 figures, 2 tables. Accepted for publication on ApJ Main Journal