Abdo AA, Ackermann M, Ajello M, Atwood WB, Axelsson M, Baldini L, Ballet J, Barbiellini G, Baring MG, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom ED, Bonamente E, Borgland AW, Bregeon J, Brez A, Brigida M, Bruel P, Burnett TH, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cavazzuti E, Cecchi C, Celik O, Chekhtman A, Cheung CC, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cominsky LR, Conrad J, Cutini S, De Angelis A, De Palma F, Di Bernardo G, Do Couto E Silva E, Drell PS, Drlica-Wagner A, Dubois R, Dumora D, Farnier C, Favuzzi C, Fegan SJ, Finke J, Focke WB, Fortin P, Foschini L, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giavitto G, Giebels B, Giglietto N, Giommi P, Giordano F, Glanzman T, Godfrey G, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Hanabata Y, Hayashida M, Hays E, Horan D, Hughes RE, Jackson MS, Johannesson G, Johnson AS, Johnson RP, Johnson WN, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kocian ML, Kuss MW, Lande J, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Makeev A, Mazziotta MN, Mcconville W, Mcenery JE, Meurer C, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nolan PL, Norris JP, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes JF, Ozaki M, Paneque D, Panetta JH, Parent D, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Reyes LC, Ritz S, Rochester LS, Rodriguez AY, Roth M, Ryde F, Sadrozinski HFW, Sanchez D, Sander A, Parkinson PMS, Scargle JD, Schalk TL, Sellerholm A, Sgro C, Shaw MS, Siskind EJ, Smith DA, Smith PD, Spandre G, Spinelli P, Strickman MS, Suson DJ, Tajima H, Takahashi HH, Takahashi T, Tanaka T, Tanaka Y, Thayer JB, Thayer JG, Thompson DJ, Tibaldo L, Torres DF, Tosti G, Tramacere A, Uchiyama Y, Usher TL, Vasileiou V, Vilchez N, Vitale V, Waite AP, Wang P, Winer BL, Wood KS, Ylinen T, Ziegler M (2009)

Publication Type: Journal article

Publication year: 2009


Book Volume: 707

Pages Range: 1310-1333

Journal Issue: 2

DOI: 10.1088/0004-637X/707/2/1310


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.

Authors with CRIS profile

Involved external institutions

U.S. Naval Research Laboratory US United States (USA) (US) Stanford University US United States (USA) (US) University of California Santa Cruz US United States (USA) (US) Stockholm University / Stockholms universitet SE Sweden (SE) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) IT Italy (IT) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot FR France (FR) Rice University US United States (USA) (US) Politecnico di Bari IT Italy (IT) École Polytechnique - Université Paris-Saclay FR France (FR) University of Washington US United States (USA) (US) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) IT Italy (IT) ASI Science Data Center (ASDC) IT Italy (IT) National Aeronautics and Space Administration (NASA) US United States (USA) (US) University of Montpellier / Université Montpellier FR France (FR) Sonoma State University US United States (USA) (US) The Oskar Klein Centre SE Sweden (SE) University of Udine / Università degli Studi di Udine IT Italy (IT) Institut national de physique nucléaire et de physique des particules (IN2P3) FR France (FR) University of Alabama in Huntsville (UAH) US United States (USA) (US) Hiroshima University / 広島大学 JP Japan (JP) Japan Aerospace eXploration Agency (JAXA) JP Japan (JP) National Academy of Sciences US United States (USA) (US) Ohio State University US United States (USA) (US) Tokyo Institute of Technology JP Japan (JP) Université Toulouse III - Paul Sabatier FR France (FR) University of Maryland US United States (USA) (US) University of Denver US United States (USA) (US) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics DE Germany (DE) University of Chicago US United States (USA) (US) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) ES Spain (ES) NYCB Real-Time Computing, Inc. US United States (USA) (US) Purdue University Northwest / Purdue University Calumet US United States (USA) (US) Institut d'Estudis Espacials de Catalunya (IEEC) ES Spain (ES)

How to cite


Abdo, A.A., Ackermann, M., Ajello, M., Atwood, W.B., Axelsson, M., Baldini, L.,... Ziegler, M. (2009). FERMI OBSERVATIONS OF TeV-SELECTED ACTIVE GALACTIC NUCLEI. Astrophysical Journal, 707(2), 1310-1333. https://doi.org/10.1088/0004-637X/707/2/1310


Abdo, A. A., et al. "FERMI OBSERVATIONS OF TeV-SELECTED ACTIVE GALACTIC NUCLEI." Astrophysical Journal 707.2 (2009): 1310-1333.

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