Fermi large area telescope observations of Markarian 421: The missing piece of its spectral energy distribution
| Title: | Fermi large area telescope observations of Markarian 421: The missing piece of its spectral energy distribution |
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| Authors: | 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; Silva EDE; Drell PS; Dubois R; Dumora D; Escande L; 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; 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; Knodlseder J; Kuss M; 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 H; 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; Gonzalez JB; 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 I; Bretz T; Camara M; Carmona E; Carosi A; Colin P; Colombo E; Contreras JL; Cortina J; Covino S; Dazzi F; del Pozo ED; Mendez CD; De Lotto B; De Maria M; De Sabata F; Ortega AD; Doert M; Dominguez A; Prester DD; Dorner D; Doro M; Elsaesser D; Ferenc D; Fonseca MV; Font L; Lopez RJG; Garczarczyk M; Gaug M; Giavitto G; Godinovi N; Herrero A; Hildebrand D; Hohne Monch D; Hose J; Hrupec D; Jogler T; Klepser S; Krahenbuhl T; Kranich D; Krause J; La Barbera A; Leonardo E; Lindfors E; Lombardi S; Lopez M; Lorenz E; Majumdar P; Makariev E; Maneva G; 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; Rugamer 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 C; 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.; FAVUZZI, Cecilia; GIGLIETTO, Nicola |
| Contributors: | 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; Silva, Ede; Drell, P; Dubois, R; Dumora, D; Escande, L; Favuzzi, Cecilia; 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, Nicola; 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, A; Johnson, Wn; Kadler, M; Kamae, T; Katagiri, H; Kataoka, J; Knodlseder, J; Kuss, M; 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 |
| Publication Year: | 2011 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Acceleration of particle; BL Lacertae objects: general; BL Lacertae objects: individual (Mrk 421); galaxies: active; gamma rays: general; radiation mechanisms: non-thermal |
| Description: | We report on the γ-ray activity of the high-synchrotron-peaked BL Lacertae object Markarian 421 (Mrk421) during the first 1.5years of Fermi operation, from 2008 August 5 to 2010 March 12. We find that the Large Area Telescope (LAT) γ-ray spectrum above 0.3GeV can be well described by a power-law function with photon index Γ = 1.78 0.02 and average photon flux F(> 0.3GeV) = (7.23 0.16) × 10-8phcm-2s -1. Over this time period, the Fermi-LAT spectrum above 0.3GeV was evaluated on seven-day-long time intervals, showing significant variations in the photon flux (up to a factor 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 γ-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 Mrk421, 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, Mrk421 showed a low activity at all wavebands. The extensive multi-instrument (radio toTeV) 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. |
| Document Type: | article in journal/newspaper |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000292977400056; volume:736; issue:2; numberofpages:22; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11589/51972 |
| DOI: | 10.1088/0004-637X/736/2/131 |
| Availability: | https://hdl.handle.net/11589/51972; https://doi.org/10.1088/0004-637X/736/2/131 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.252C54B4 |
| Database: | BASE |