Measurement of the extragalactic background light using MAGIC and Fermi-LAT gamma-ray observations of blazars up to z = 1
Date Issued
2019
Author(s)
Acciari, V. A.
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Ansoldi, S.
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Arbet Engels, A.
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Baack, D.
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Babić, A.
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Banerjee, B.
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Barres de Almeida, U.
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Barrio, J. A.
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Becerra González, J.
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Bednarek, W.
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Puljak, I.
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Rhode, W.
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Berti, A.
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Ribó, M.
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Rico, J.
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Rugliancich, A.
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Saha, L.
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Sahakyan, N.
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Saito, T.
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Dominis Prester, D.
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Satalecka, K.
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Schweizer, T.
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Sitarek, J.
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Besenrieder, J.
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Šnidarić, I.
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Sobczynska, D.
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Somero, A.
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Strom, D.
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Strzys, M.
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Dorner, D.
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Surić, T.
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Temnikov, P.
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Terzić
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Bhattacharyya, W.
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Teshima, M.
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Torres-Albà, N.
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Tsujimoto, S.
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van Scherpenberg, J.
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Vanzo, G.
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Doro, M.
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Vázquez Acosta, M.
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Vovk, I.
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Will, M.
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Zarić, D.
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Biland, A.
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Blanch, O.
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Busetto, G.
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Carosi, R.
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Elsaesser, D.
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Ceribella, G.
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Chai, Y.
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Cikota, S.
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Colak, S. M.
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Colin, U.
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Colombo, E.
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Contreras, J. L.
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Cortina, J.
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D'Elia, V.
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Fallah Ramazani, V.
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Da Vela, P.
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De Angelis, A.
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De Lotto, B.
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Delfino, M.
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Delgado, J.
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Di Pierro, F.
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Do Souto Espiñeira, E.
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Domínguez, A.
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Fattorini, A.
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Fernández-Barral, A.
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Ferrara, G.
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Fidalgo, D.
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Foffano, L.
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Mirzoyan, R.
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Fonseca, M. V.
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Font, L.
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Fruck, C.
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Galindo, D.
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García López, R. J.
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Garczarczyk, M.
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Gasparyan, S.
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Gaug, M.
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Godinović, N.
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Molina, E.
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Green, D.
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Guberman, D.
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Hadasch, D.
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Hahn, A.
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Hassan, T.
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Herrera, J.
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Hoang, J.
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Hrupec, D.
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Inoue, S.
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Ishio, K.
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Moralejo, A.
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Iwamura, Y.
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Kubo, H.
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Kushida, J.
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Lelas, D.
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Lindfors, E.
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Longo, F.
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López, M.
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Morcuende, D.
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López-Coto, R.
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López-Oramas, A.
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Machado de Oliveira Fraga, B.
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Maggio, C.
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Majumdar, P.
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Makariev, M.
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Mallamaci, M.
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Maneva, G.
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Manganaro, M.
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Mannheim, K.
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Moreno, V.
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Maraschi, L.
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Mariotti, M.
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Martínez, M.
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Masuda, S.
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Mazin, D.
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Mićanović, S.
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Miceli, D.
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Minev, M.
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Miranda, J. M.
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Moretti, E.
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Munar-Adrover, P.
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Neustroev, V.
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Niedzwiecki, A.
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Nievas Rosillo, M.
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Bellizzi, L.
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Nigro, C.
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Nilsson, K.
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Ninci, D.
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Nishijima, K.
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Noda, K.
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Nogués, L.
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Nöthe, M.
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Palacio, J.
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Palatiello, M.
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Bernardini, E.
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Paneque, D.
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Paoletti, R.
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Paredes, J. M.
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Peñil, P.
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Peresano, M.
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Prada Moroni, P. G.
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Abstract
We present a measurement of the extragalactic background light (EBL) based on a joint likelihood analysis of 32 gamma-ray spectra for 12 blazars in the redshift range z = 0.03-0.944, obtained by the MAGIC telescopes and Fermi-LAT. The EBL is the part of the diffuse extragalactic radiation spanning the ultraviolet, visible, and infrared bands. Major contributors to the EBL are the light emitted by stars through the history of the Universe, and the fraction of it that was absorbed by dust in galaxies and re-emitted at longer wavelengths. The EBL can be studied indirectly through its effect on very high energy photons that are emitted by cosmic sources and absorbed via γγ interactions during their propagation across cosmological distances. We obtain estimates of the EBL density in good agreement with state-of-the-art models of the EBL production and evolution. The 1σ upper bounds, including systematic uncertainties, are between 13 per cent and 23 per cent above the nominal EBL density in the models. No anomaly in the expected transparency of the Universe to gamma-rays is observed in any range of optical depth. We also perform a wavelength-resolved EBL determination, which results in a hint of an excess of EBL in the 0.18-0.62 μ m range relative to the studied models, yet compatible with them within systematics.
Volume
486
Issue
3
Start page
4233
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.486.4233A
Rights
open.access
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