Bibcode
Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.; Arbet Engels, A.; Baack, D.; Babić; , A.; Banerjee, B.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bellizzi, L.; Bernardini, E.; Berti, A.; Besenrieder, J.; Bhattacharyya, W.; Bigongiari, C.; Biland, A.; Blanch, O.; Bonnoli, G.; Busetto, G.; Carosi, R.; Ceribella, G.; Chai, Y.; Cikota, S.; Colak, S. M.; Colin, U.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; D'Elia, V.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Lotto, B.; Delfino, M.; Delgado, J.; Di Pierro, F.; Do Souto Espiñeira, E.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Elsaesser, D.; Fallah Ramazani, V.; Fattorini, A.; Fernández-Barral, A.; Ferrara, G.; Fidalgo, D.; Foffano, L.; Fonseca, M. V.; Font, L.; Fruck, C.; Galindo, D.; Gallozzi, S.; García López, R. J.; Garczarczyk, M.; Gasparyan, S.; Gaug, M.; Godinović; , N.; Green, D.; Guberman, D.; Hadasch, D.; Hahn, A.; Hassan, T.; Herrera, J.; Hoang, J.; Hrupec, D.; Inoue, S.; Ishio, K.; Iwamura, Y.; Kubo, H.; Kushida, J.; Lamastra, A.; Lelas, D.; Leone, F.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López-Coto, R.; López-Oramas, A.; Machado de Oliveira Fraga, B.; Maggio, C.; Majumdar, P.; Makariev, M.; Mallamaci, M.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Masuda, S.; Mazin, D.; Mić; anović et al.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 3, p.4233-4251
Fecha de publicación:
7
2019
Número de citas
80
Número de citas referidas
72
Descripción
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.
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Ramón
García López