Multiwavelength observations of the AGN 1ES 0414+009 with VERITAS, Fermi-LAT, Swift-XRT, and MDM

• Published in: arXiv.org 2012-06
• Main Authors: Aliu, E, Archambault, S, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Bouvier, A, Bugaev, V, Cannon, A, Cesarini, A, Ciupik, L, Collins-Hughes, E, Connolly, M P, Cui, W, Dickherber, R, Dumm, J, Errando, M, Falcone, A, Federici, S, Feng, Q, Finley, J P, Finnegan, G, tson, L, Furniss, A, Galante, N, Gall, D, Godambe, S, Griffin, S, Grube, J, Gyuk, G, Hanna, D, Huan, H, Hughes, G, Hui, C M, Imran, A, Jameil, O, Kaaret, P, Karlsson, N, Kertzman, M, Kerr, J, Khassen, Y, Kieda, D, Krawczynski, H, Krennrich, F, Lang, M J, Lee, K, Madhavan, A S, Majumdar, P, McArthur, S, McCann, A, Moriarty, P, Mukherjee, R, Nelson, T, A O'Faolain de Bhroithe, Ong, R A, Orr, M, Otte, A N, Park, N, Perkins, J S, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, P T, Roache, E, Ruppel, J, Saxon, D B, Schroedter, M, Sembroski, G H, Senturk, G D, Smith, A W, Staszak, D, Stroh, M, Telezhinsky, I, Tesic, G, Theiling, M, Thibadeau, S, Tsurusaki, K, Varlotta, A, Vassiliev, V V, Vivier, M, Wakely, S P, Ward, J E, Weinstein, A, Welsing, R, Williams, D A, Zitzer, B
• Format: Article
• Language: English
• Subjects: BL Lacertae objects; Broadband; Crab nebula; Flux; Gamma rays; Photons; Spectral energy distribution; Telescopes
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1206.4080

We present observations of the BL Lac object 1ES 0414+009 in the >200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between January 2008 and February 2011, resulting in 56.2 hours of good quality pointed observations. These observations resulted in a detection of 822 events from the source corresponding to a statistical significance of 6.4 standard deviations (6.4 sigma) above the background. The source flux, showing no evidence for variability, is measured as 5.2 +/- 1.1_stat +/- 2.6_sys * 10^-12 photons cm^-2 s^-1 above 200 GeV, equivalent to approximately 2% of the Crab Nebula flux above this energy. The differential photon spectrum from 230 GeV to 850 GeV is well fit by a power law with an photon index of Gamma 3.4 +/- 0.5_stat +/- 0.3_sys and a flux normalization of 1.6 +/- 0.3_stat +/- 0.8_sys * 10^-11 photons cm^-2 s^-1 at 300 GeV. We also present multiwavelength results taken in the optical (MDM), X-ray (Swift-XRT), and GeV (Fermi-LAT) bands and use these results to construct a broadband spectral energy distribution (SED). Modeling of this SED indicates that homogenous one-zone leptonic scenarios are not adequate to describe emission from the system, with a lepto-hadronic model providing a better fit to the data.