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Archambault, S,Arlen, T,Aune, T,Beilicke, M,Benbow, W,Bird, R,Bottcher, M,Bouvier, A,Buckley, JH,Bugaev, V,Ciupik, L,Collins-Hughes, E,Connolly, MP,Cui, W,Dickherber, R,Dumm, J,Errando, M,Falcone, A,Federici, S,Feng, Q,Finley, JP,Fortson, L,Furniss, A,Galante, N,Gall, D,Garson, AI,Gillanders, GH,Griffin, S,Grube, J,Gusbar, C,Gyuk, G,Hanna, D,Holder, J,Hughes, G,Kaaret, P,Kertzman, M,Khassen, Y,Kieda, D,Krawczynski, H,Lamerato, A,Lang, MJ,Li, K,Madhavan, AS,Maier, G,Majumdar, P,McArthur, S,McCann, A,Millis, J,Moriarty, P,Mukherjee, R,Nieto, D,De Bhroithe, AO,Ong, RA,Orr, M,Otte, AN,Park, N,Perkins, JS,Pohl, M,Popkow, A,Prokoph, H,Quinn, J,Ragan, K,Reynolds, PT,Richards, GT,Roache, E,Roustazadeh, P,Saxon, DB,Sembroski, GH,Senturk, GD,Skole, C,Staszak, D,Telezhinsky, I,Tesic, G,Theiling, M,V
2014
June
Astrophysical Journal
TEST OF MODELS OF THE COSMIC INFRARED BACKGROUND WITH MULTIWAVELENGTH OBSERVATIONS OF THE BLAZAR 1ES 1218+30.4 IN 2009
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BL Lacertae objects: general BL Lacertae objects: individual (1ES1218+30.4) cosmic background radiation diffuse radiation galaxies: jets gamma rays: galaxies GAMMA-RAY OBSERVATIONS EXTRAGALACTIC MAGNETIC-FIELDS ACTIVE GALACTIC NUCLEI LARGE-AREA TELESCOPE X-RAY TEV BLAZARS PARTICLE-ACCELERATION VERITAS OBSERVATIONS TIMING EXPLORER STRONG FLARES
788
We present the results of a multi-wavelength campaign targeting the blazar 1ES 1218+30.4 with observations with the 1.3 m McGraw-Hill optical telescope, the Rossi X-ray Timing Explorer (RXTE), the Fermi Gamma-Ray Space Telescope, and the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The RXTE and VERITAS observations were spread over a 13 day period and revealed clear evidence for flux variability, and a strong X-ray and gamma-ray flare on 2009 February 26 (MJD 54888). The campaign delivered a well-sampled broadband energy spectrum with simultaneous RXTE and VERITAS very high energy (VHE, > 100 GeV) observations, as well as contemporaneous optical and Fermi observations. The 1ES 1218+30.4 broadband energy spectrum-the first with simultaneous X-ray and VHE gamma-ray energy spectra-is of particular interest as the source is located at a high cosmological redshift for a VHE source (z = 0.182), leading to strong absorption of VHE gamma rays by photons from the optical/infrared extragalactic background light (EBL) via gamma VHE +gamma EBL -> e(+) e(-)pair-creation processes. We model the data with a one-zone synchrotron self-Compton (SSC) emission model and with the extragalactic absorption predicted by several recent EBL models. We find that the observations are consistent with the SSC scenario and all the EBL models considered in this work. We discuss observational and theoretical avenues to improve on the EBL constraints.
10.1088/0004-637X/788/2/158
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