FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275

Abdo AA, Ackermann M, Ajello M, Asano K, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman BM, Bechtol K, Bellazzini R, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bregeon J, Brez A, Brigida M, Bruel P, Burnett TH, Caliandro GA, Cameron RA, Caraveo A, Casandjian JM, Cavazzuti E, Cecchi C, Celotti A, Chekhtman A, Cheung CC, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Cominsky LR, Conrad J, Costamante L, Dermer CD, De Angelis A, De Palma F, Digel SW, Donato D, Do Couto E Silva E, Drell PS, Dubois R, Dumora D, Farnier C, Favuzzi C, Finke J, Focke WB, Frailis M, Fukazawa Y, Funk S, Fusco P, Gargano F, Georganopoulos M, Germani S, Giebels B, Giglietto N, Giordano F, Glanzman T, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Hanabata Y, Harding AK, Hartman RC, Hayashida M, Hays E, Hughes RE, Johannesson G, Johnson AS, Johnson RP, Johnson WN, Kadler M, Kamae T, Kanai Y, Katagiri H, Kataoka J, Kawai N, Kerr M, Knoedlseder J, Kuehn F, Kuss MW, Latronico L, Lemoine-Goumard M, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Makeev A, Mazziotta MN, Mcenery JE, Meurer C, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev A, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nakamori T, Nolan L, Norris JP, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes JF, Paneque D, Panetta JH, Parent D, Pepe M, Pesce-Rollins M, Piron F, Porter TA, Raino S, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Rodriguez AY, Romani RW, Ryde F, Sadrozinski HFW, Sambruna R, Sanchez D, Sander A, Sato R, Parkinson PMS, Sgro C, Smith DA, Smith PD, Spandre G, Spinelli P, Starck JL, Strickman MS, Strong AW, Suson DJ, Tajima H, Takahashi HH, Takahashi T, Tanaka T, Taylor GB, Thayer JG, Thompson DJ, Torres DF, Tosti G, Uchiyama Y, Usher TL, Vilchez N, Vitale V, Waite AP, Wood KS, Ylinen T, Ziegler M, Aller HD, Aller MF, Kellermann KI, Kovalev YY, Kovalev YA, Lister ML, Pushkarev AB (2009)

Publication Type: Journal article

Publication year: 2009

Journal

Book Volume: 699

Pages Range: 31-39

Journal Issue: 1

DOI: 10.1088/0004-637X/699/1/31

Abstract

We report the discovery of high-energy (E > 100 MeV) gamma-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope. The positional center of the gamma-ray source is only approximate to 3' away from the NGC 1275 nucleus, well within the 95% LAT error circle of approximate to 5'. The spatial distribution of gamma-ay photons is consistent with a point source. The average flux and power-law photon index measured with the LAT from 2008 August 4 to 2008 December 5 are F-gamma = (2.10 +/- 0.23) x 10(-7) ph (>100 MeV) cm(-2) s(-1) and Gamma = 2.17 +/- 0.05, respectively. The measurements are statistically consistent with constant flux during the four-month LAT observing period. Previous EGRET observations gave an upper limit of F-gamma < 3.72 x 10(-8) ph (>100 MeV) cm(-2) s(-1) to the gamma-ray flux from NGC 1275. This indicates that the source is variable on timescales of years to decades, and therefore restricts the fraction of emission that can be produced in extended regions of the galaxy cluster. Contemporaneous and historical radio observations are also reported. The broadband spectrum of NGC 1275 is modeled with a simple one-zone synchrotron/synchrotron self-Compton model and a model with a decelerating jet flow.

Authors with CRIS profile

Involved external institutions

U.S. Naval Research Laboratory United States (USA) (US) Stanford University United States (USA) (US) Tokyo Institute of Technology Japan (JP) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) Ohio State University United States (USA) (US) Politecnico di Bari Italy (IT) École Polytechnique - Université Paris-Saclay France (FR) University of Washington United States (USA) (US) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) ASI Science Data Center (ASDC) Italy (IT) Scuola Internazionale Superiore di Studi Avanzati (SISSA) Italy (IT) University of Udine / Università degli Studi di Udine Italy (IT) Université Bordeaux 1, Sciences et Technologies France (FR) University of Alabama in Huntsville (UAH) United States (USA) (US) Hiroshima University Japan (JP) National Aeronautics and Space Administration (NASA) United States (USA) (US) University of Denver United States (USA) (US) University of California Santa Cruz United States (USA) (US) University of New Mexico (UNM) / Universidad de Nuevo México United States (USA) (US) Institució Catalana de Recerca i Estudis Avançats (ICREA) / Catalan Institution for Research and Advanced Studies Spain (ES) The Oskar Klein Centre Sweden (SE) University of Michigan United States (USA) (US) National Radio Astronomy Observatory (NRAO) United States (USA) (US) Lebedev Physical Institute of the Russian Academy of Sciences (LPI RAS) / Физи́ческий институ́т имени П.Н.Ле́бедева Российской академии наук (ФИАН) Russian Federation (RU) University of Montpellier / Université Montpellier France (FR) Sonoma State University United States (USA) (US) Riken Institute of Physical and Chemical Research / 理研 Japan (JP) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) University of Maryland United States (USA) (US) Japan Aerospace eXploration Agency (JAXA) Japan (JP) University of Maryland, Baltimore County United States (USA) (US) Université Toulouse III - Paul Sabatier France (FR) Purdue University Northwest / Purdue University Calumet United States (USA) (US) Waseda University / 早稲田大学 Japan (JP) Purdue-University United States (USA) (US) Max-Planck-Institut für Radioastronomie / Max Planck Institute for Radio Astronomy Germany (DE)

How to cite

APA:

Abdo, A.A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J.,... Pushkarev, A.B. (2009). FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275. Astrophysical Journal, 699(1), 31-39. https://dx.doi.org/10.1088/0004-637X/699/1/31

MLA:

Abdo, A. A., et al. "FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275." Astrophysical Journal 699.1 (2009): 31-39.

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