HESS and Fermi-LAT discovery of [gamma]-rays from the blazar 1ES 1312-423

• Published in: Monthly notices of the Royal Astronomical Society Vol. 434; no. 3; p. 1889
• Main Authors: Aharonian, F, Akhperjanian, A G, Angüner, E, Balenderan, S, Balzer, A, Barnacka, A, Kosack, K, Krüger, P P, Lamanna, G, Tjus, J Becker, Lemoine-Goumard, M, Lu, C-C, Bernlöhr, K, Mayer, M, McComb, T J L, Méhault, J, Meyer, M, Moderski, R, Mohamed, M, Moulin, E, Murach, T, Nedbal, D, Nolan, S J, Ohm, S, Ostrowski, M, Panter, M, Parsons, R D, Pekeur, N W, Petrucci, P-O, Quirrenbach, A, Raab, S, Raue, M, Reimer, A, Reimer, O, Rieger, F, Rosier-Lees, S, Rowell, G, Sahakian, V, Sanchez, D A, Santangelo, A, Schlickeiser, R, Schwanke, U, Schwemmer, S, Spiess, F, Stawarz, L, Stycz, K, Szostek, A, Terrier, R, Tluczykont, M, Trichard, C, Valerius, K, van Eldik, C, Vasileiadis, G, Venter, C, Völk, H J, Vorster, M, Wagner, P, Willmann, P, Zdziarski, A A, Brun, P, Zech, A, Zechlin, H-S, Ojha, R, Kadler, M, Bulik, T, Carrigan, S, Cerruti, M, Chadwick, P M, Chaves, R C G, Cheesebrough, A, Colafrancesco, S, Couturier, C, Daniel, M K, Davids, I D, Dickinson, H J, Domainko, W, Drury, L, Edwards, T, Fegan, S, Feinstein, F, Fernandez, D, Gajdus, M, Garrigoux, T, Gast, H, Giebels, B, Glicenstein, J F, Göring, D, Grondin, M-H, Häffner, S, Hague, J D, Hahn, J, Harris, J, Hinton, J A, Holler, M, Horns, D, Kastendieck, M A, Katz, U, Khélifi, B, Klepser, S, Klochkov, D
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 21-09-2013
• Subjects: Astrophysics; Nebulae; Radio astronomy; Spectrum analysis; Star & galaxy formation; Telescopes; X-ray astronomy
• ISSN: 0035-8711; 1365-2966

A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of ...-rays from the blazar 1ES 1312...423, 2... away from the radio galaxy. With a differential flux at 1 TeV of ...(1 TeV) = (1.9 ± 0.6... ± 0.4...) x 10... cm... s... TeV... corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index ... = 2.9 ± 0.5... ± 0.2..., 1ES 1312 423 is one of the faintest sources ever detected in the very high energy (E > 100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi Large Area Telescope (Fermi-LAT) data allows the discovery at high energies (E > 100 MeV) of a hard spectrum (... = 1.4 ± 0.4... ± 0.2...) source coincident with 1ES 1312...423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self-Compton model for the non-thermal component, combined with a blackbody spectrum for the optical emission from the host galaxy. (ProQuest: ... denotes formulae/symbols omitted.)