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001     316737
005     20211110140504.0
020 _ _ |a 978-3-935702-43-0
024 7 _ |a 10.3204/DESY-PROC-2015-02/roncadelli_marco
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024 7 _ |a 1435-8077
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037 _ _ |a PUBDB-2017-00135
041 _ _ |a English
100 1 _ |a Roncadelli, Marco
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111 2 _ |a 11th Patras Workshop on Axions, WIMPs and WISPs
|c Zaragoza
|d 2015-06-22 - 2015-06-26
|g AXION-WIMP 2015
|0 C15-06-22.2
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|w Spain
245 _ _ |a ALPs Explain the Observed Redshift-Dependence of Blazar Spectra
260 _ _ |a Hamburg
|c 2015
|b Verlag Deutsches Elektronen-Synchrotron
295 1 0 |a Roncadelli, Marco "ALPs Explain the Observed Redshift-Dependence of Blazar Spectra" in Proceedings, 11th Patras Workshop on Axions, WIMPs and WISPs (Axion-WIMP 2015) / Irastorza, Igor G., Redondo, Javier, Carmona, José Manuel, Cebrian, Susana, Dafni, Theopisti, Iguaz, Francisco J., Luzon, Gloria (eds.), Verlag Deutsches Elektronen-Synchrotron : 2015 ; AXION-WIMP 2015 : 11th Patras Workshop on Axions, WIMPs and WISPs, 2015-06-22 - 2015-06-26, Zaragoza
300 _ _ |a 82-87
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490 0 _ |a DESY-PROC
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520 _ _ |a We considered a complete sample of blazars observed with the Imaging Atmospheric Cherenkov Telescopes above $E \geq 80 \, {\rm GeV}$, out to $z = 0.54$ and described by standard photon emission models which predict simple power-law spectra to a good approximation. We first show that the best-fit regression line of the emitted slope distribution $\{\Gamma_{\rm em} (z) \}$ decreases with $z$, in disagreement with physical intuition. Next, we demonstrate that, by allowing for photon-ALP oscillations in intergalactic space, for a realistic values of the parameters the best-fit regression line becomes exactly horizontal in the $\Gamma_{\rm em} - z$ plane. This result is amazing, because it is the only possibility in agreement with physical expectation, and so it can be regarded as a strong hint of the existence of an ALP.
700 1 _ |a Galanti, Giorgio
|0 P:(DE-HGF)0
|b 1
700 1 _ |a De Angelis, Alessandro
|0 P:(DE-HGF)0
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700 1 _ |a Bignami, Giovanni F.
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787 0 _ |a Irastorza, Igor G. et. al.
|d Verlag Deutsches Elektronen-Synchrotron
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|r DESY-PROC-2015-02
|t Proceedings, 11th Patras Workshop on Axions, WIMPs and WISPs (Axion-WIMP 2015)
856 4 _ |u https://bib-pubdb1.desy.de/record/316737/files/fulltext.pdf
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910 1 _ |a INFN, Pavia
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910 1 _ |a Insubria U., Como
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910 1 _ |a INFN, Padua
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910 1 _ |a INAF, Rome
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