Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S.
By H. C. A. Abramowski, F. Acero, F. Aharonian, A. Akhperjanian, G. Anton, S. Balenderan, A. Balzer, A. Barnacka, Y. Becherini, J. Tjus and 186 more. 2012
189 citations recorded by the source corpus.
The extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this study is the measurement of the imprint of the EBL opacity to gamma-rays on the spectra of the brightest extragalactic sources detected with the High Energy Stereoscopic System (H.E.S.S.). The originality of the method lies in the joint fit of the EBL optical depth and of the intrinsic spectra of the sources, assuming intrinsic smoothness. Analysis of a total of ~10^5 gamma-ray events enables the detection of an EBL signature at the 8.8 std dev level and constitutes the first measurement of the EBL optical depth using very-high energy (E>100 GeV) gamma-rays. The EBL flux density is constrained over almost two decades of wavelengths (0.30-17 microns) and the peak value at 1.4 micron is derived as 15 +/- 2 (stat) +/- 3 (sys) nW / m^2 sr.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/85a02bd47e1dfd2cc6d39e6b0c3c8cfe18d9ada7
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In Astronomy and Astrophysics
- A. Strong
- E. Orlando
- Anna Franckowiak
- Igor G. Irastorza
- J. Biteau
- David A. Williams
- Igor V. Moskalenko
- G. Zaharijas
In Nuclear and High Energy Physics
- A. Strong
- Anna Franckowiak
- E. Orlando
- Igor G. Irastorza
- J. Biteau
- Igor V. Moskalenko
- David A. Williams
- G. Zaharijas
Citations in the corpus
- The extragalactic background light revisited and the cosmic photon–photon opacity (Corrigendum) (2017, background): “Abramowski et al. (2013) present a joint analysis of the spectra of a sample of blazars totaling approximately 105 VHE gamma-ray events.”
- THE EXTRAGALACTIC BACKGROUND LIGHT, THE HUBBLE CONSTANT, AND ANOMALIES: CONCLUSIONS FROM 20 YEARS OF TeV GAMMA-RAY OBSERVATIONS (2015, background): “We note nonetheless that a large fraction of the parameter space corresponding to these hints has been excluded by Abramowski et al. (2013) using the lack of point-to-point fluctuations in the spectrum of the bright blazar PKS 2155–304.”
- Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background (2015, methodology): “e extragalactic background light (EBL), which represents the state-of-the-art and is fully consistent with the rst direct detections of the EBL attenuation by the LAT [53] and H.E.S.S. collaborations [54], and with the recently measured cosmic gamma-ray horizon [55]. In gure3we show a typical exampl”
- New experimental approaches in the search for axion-like particles (2018, methodology): “Both the HESS [371] and the Fermi-LAT [372] collaborations, using data from two particular sources, have relevant exclusions in the mass range 10−11−10−7 eV.”