MULTIWAVELENGTH OBSERVATIONS OF THE AGN 1ES 0414+009 WITH VERITAS, FERMI-LAT, SWIFT-XRT, AND MDM

作者：Aliu E^*; Archambault S; Arlen T; Aune T; Beilicke M; Benbow W; Boettcher 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; Fortson L; Furniss A; Galante N; Gall D; Godambe S; Griffin S; Grube J; Gyuk G; Hanna D; Holder J; Huan H; Hughes G; Hui C M; Imran A; Jameil O; Kaaret P

来源：Astrophysical Journal, 2012, 755(2): 118.

DOI：10.1088/0004-637X/755/2/118

• BL Lacertae objects: individual (1ES 0414+009, ERJ0416+011)
• gamma rays: galaxies

We present observations of the BL Lac object 1ES 0414+009 in the %26gt;200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between 2008 January and 2011 February, resulting in 56.2 hr 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)) x 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 a 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)) x 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.

• 出版日期2012-8-20