Abdo AA, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Cannon A, Caraveo PA, Carrigan S, Casandjian JM, Cavazzuti E, Cecchi C, Celik O, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cutini S, De Angelis A, De Palma F, Dermer CD, Do Couto E Silva E, Drell PS, Dubois R, Dumora D, Escande L, Favuzzi C, Fegan SJ, Finke J, Focke WB, Fortin P, Frailis M, Fuhrmann L, Fukazawa Y, Fukuyama T, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Georganopoulos M, Germani S, Giebels B, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Guiriec S, Hadasch D, Hayashida M, Hays E, Horan D, Hughes RE, Johannesson G, Johnson AS, Johnson WN, Kadler M, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss MW, Lande J, Latronico L, Lee SH, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Makeev A, Max-Moerbeck W, Mazziotta MN, Mcenery JE, Mehault J, Michelson PF, Mitthumsiri W, Mizuno T, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nakamori T, Naumann-Godo M, Nishino S, Nolan PL, Norris JP, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes JF, Ozaki M, Paneque D, Panetta JH, Parent D, Pavlidou V, Pearson TJ, Pelassa V, Pepe M, Pesce-Rollins M, Pierbattista M, Piron F, Porter TA, Raino S, Rando R, Razzano M, Readhead A, Reimer A, Reimer O, Reyes LC, Richards JL, Ritz S, Roth M, Sadrozinski HFW, Sanchez D, Sander A, Sgro C, Siskind EJ, Smith PD, Spandre G, Spinelli P, Stawarz L, Stevenson M, Strickman MS, Suson DJ, Takahashi HH, Takahashi T, Tanaka T, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Torres DF, Tosti G, Tramacere A, Troja E, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite AP, Wang P, Wehrle AE, Winer BL, Wood KS, Yang Z, Yatsu Y, Ylinen T, Zensus JA, Ziegler M, Aleksic J, Antonelli LA, Antoranz P, Backes M, Barrio JA, Becerra Gonzalez J, Bednarek W, Berdyugin A, Berger K, Bernardini E, Biland A, Blanch O, Bock RK, Boller A, Bonnoli G, Bordas P, Tridon DB, Bosch-Ramon V, Bose D, Braun IV, Bretz T, Camara MB, Carmona E, Carosi A, Colin P, Colombo EH, Contreras JL, Cortina J, Covino S, Dazzi F, De Angelis A, De Cea Del Pozo E, Delgado Mendez C, De Lotto B, De Maria M, De Sabata F, Diago Ortega A, Doert M, Dominguez A, Prester DD, Dorner D, Doro M, Elsaesser D, Ferenc D, Fonseca MV, Font L, Garcia Lopez RJ, Garczarczyk M, Gaug M, Giavitto G, Godinovi N, Hadasch D, Herrero A, Hildebrand D, Hoehne-Moench D, Hose J, Hrupec D, Jogler T, Klepser S, Kraehenbuehl T, Kranich D, Krause J, La Barbera A, Leonardo E, Lindfors E, Lombardi S, Lopez M, Lorenz E, Majumdar P, Makariev E, Maneva GM, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martinez M, Mazin D, Meucci M, Miranda JM, Mirzoyan R, Miyamoto H, Moldon J, Moralejo A, Nieto D, Nilsson K, Orito R, Oya I, Paoletti R, Paredes JM, Partini S, Pasanen M, Pauss F, Pegna RG, Perez-Torres MA, Persic M, Peruzzo J, Pochon J, Prada F, Moroni PGP, Prandini E, Puchades N, Puljak I, Reichardt T, Rhode W, Ribo M, Rico J, Rissi M, Ruegamer S, Saggion A, Saito K, Saito TY, Salvati M, Sanchez-Conde M, Satalecka K, Scalzotto V, Scapin V, Schultz C, Schweizer T, Shayduk M, Shore SN, Sierpowska-Bartosik A, Sillanpaa A, Sitarek J, Sobczynska D, Spanier F, Spiro S, Stamerra A, Steinke B, Storz J, Strah N, Struebig JC, Suric T, Takalo LO, Tavecchio F, Temnikov P, Terzic T, Tescaro D, Teshima M, Vankov H, Wagner RM, Weitzel Q, Zabalza V, Zandanel F, Zanin R, Villata M, Raiteri CM, Aller HD, Aller MF, Chen WP, Jordan B, Koptelova E, Kurtanidze OM, Lahteenmaki A, Mcbreen B, Larionov VM, Lin CS, Nikolashvili MG, Reinthal R, Angelakis E, Capalbi M, Carraminana A, Carrasco L, Cassaro P, Cesarini A, Falcone A, Gurwell MA, Hovatta T, Kovalev YA, Kovalev YY, Krichbaum TP, Krimm HA, Lister ML, Moody JW, Maccaferri G, Mori Y, Nestoras I, Orlati A, Pace C, Pagani C, Pearson R, Perri M, Piner BG, Ros E, Sadun AC, Sakamoto T, Tammi J, Zook A (2011)
Publication Type: Journal article
Publication year: 2011
Book Volume: 736
Journal Issue: 2
DOI: 10.1088/0004-637X/736/2/131
We report on the gamma-ray activity of the high-synchrotron-peaked BL Lacertae object Markarian 421 (Mrk 421) during the first 1.5 years of Fermi operation, from 2008 August 5 to 2010 March 12. We find that the Large Area Telescope (LAT) gamma-ray spectrum above 0.3 GeV can be well described by a power-law function with photon index Gamma = 1.78 +/- 0.02 and average photon flux F(>0.3 GeV) = (7.23 +/- 0.16) x 10(-8) ph cm(-2) s(-1). Over this time period, the Fermi-LAT spectrum above 0.3 GeV was evaluated on seven-day-long time intervals, showing significant variations in the photon flux (up to a factor similar to 3 from the minimum to the maximum flux) but mild spectral variations. The variability amplitude at X-ray frequencies measured by RXTE/ASM and Swift/BAT is substantially larger than that in gamma-rays measured by Fermi-LAT, and these two energy ranges are not significantly correlated. We also present the first results from the 4.5 month long multifrequency campaign on Mrk 421, which included the VLBA, Swift, RXTE, MAGIC, the F-GAMMA, GASP-WEBT, and other collaborations and instruments that provided excellent temporal and energy coverage of the source throughout the entire campaign (2009 January 19 to 2009 June 1). During this campaign, Mrk 421 showed a low activity at all wavebands. The extensive multi-instrument (radio to TeV) data set provides an unprecedented, complete look at the quiescent spectral energy distribution (SED) for this source. The broadband SED was reproduced with a leptonic (one-zone synchrotron self-Compton) and a hadronic model (synchrotron proton blazar). Both frameworks are able to describe the average SED reasonably well, implying comparable jet powers but very different characteristics for the blazar emission site.
APA:
Abdo, A.A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G.,... Zook, A. (2011). FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MARKARIAN 421: THE MISSING PIECE OF ITS SPECTRAL ENERGY DISTRIBUTION. Astrophysical Journal, 736(2). https://dx.doi.org/10.1088/0004-637X/736/2/131
MLA:
Abdo, A. A., et al. "FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MARKARIAN 421: THE MISSING PIECE OF ITS SPECTRAL ENERGY DISTRIBUTION." Astrophysical Journal 736.2 (2011).
BibTeX: Download