New Spectral Evidence of an Unaccounted Component of the Near-infrared Extragalactic Background Light from the CIBER

Matsuura, Shuji; Arai, Toshiaki; Bock, J. J.; Cooray, Asantha; Korngut, Phillip; Kim, Min; Lee, Hyung Mok; Lee, Dong Hoon; Levenson, L.; Matsumoto, Toshio; Onishi, Yutaka; Shirahata, Mai; Tsumura, Kohji; Wada, Takehiko; Zemcov, Michael

doi:10.3847/1538-4357/aa6843

Cited by 96 publications

(118 citation statements)

References 61 publications

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“…Presence of the bump leads to a characteristic dip in the observed γ-ray spectra of distant sources. We have shown that account of possible spectral feature in the EBL makes constraints on the EBL flux from the γ-ray measurements consistent with "minimal EBL" flux level reported by direct measurement experiments in the 1 micron wavelength range (Matsuura et al 2017).…”

Section: Introductionsupporting

confidence: 72%

Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars

Korochkin

Neronov

Semikoz

2020

J. Cosmol. Astropart. Phys.

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Context. Decaying axion-like particles (ALP) with masses in the eV range which might occupy dark matter halos of the Milky Way and other galaxies produce a characteristic "bump" feature in the spectrum of extragalactic background light (EBL). This feature leaves an imprint on the gamma-ray spectra of distant extragalactic sources. Aims. We derive constraints on the ALP coupling to photons based on analysis of spectra of very-high-energy gamma-ray loud blazars. Methods. We combine gamma-ray spectral measurements by Fermi/LAT and Cherenkov telescopes and fit a model in which the intrinsic source spectrum is modified by pair production on photons produced by ALP decays. We constrain the amplitude of gamma-ray flux suppression by this effect.Results. We find that the combined Fermi/LAT and VERITAS data set for the source 1ES 1218+304 currently provides the tightest constraint on ALP-two-photon coupling which is complementary to the constraints imposed by non-observation of excess energy loss in Horizontal Branch stars, by the high-resolution spectroscopic observations of galaxy clusters with optical telescopes and by the searches of ALP signal with CERN Solar Axion Telescope. Our analysis favours existence of a bump in the EBL spectrum which could be produced by ALPs in the mass range 2-3 eV and axion-photon coupling ∼ 10 −10 GeV −1 . We discuss possibilities for verification of this hint with deeper Cherenkov telescope observations of large number of blazars with current generation instruments and with the Cherenkov Telescope Array.

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Section: Introductionsupporting

confidence: 72%

Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars

Korochkin

Neronov

Semikoz

2020

J. Cosmol. Astropart. Phys.

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“…Matsumoto et al (2005), however, using their IRTS data have announced and Matsumoto et al (2015) repeated the claim for detection of an excess emission of up to 6 times as large as the IGL at λ = 1 − 2 µm. A large excess has also been found by Sano et al (2015) at 1.25 µm and by Matsuura et al (2017) at 1 − 1.7 µm. It has been poined out by e.g.…”

Section: Optical Ebl In Context Of Other Wavelengthsmentioning

confidence: 64%

Extragalactic background light: a measurement at 400 nm using dark cloud shadow – II. Spectroscopic separation of the dark cloud’s light, and results★

Mattila

Vaïsänen

Lehtinen

et al. 2017

Monthly Notices of the Royal Astronomical Society

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In a project aimed at measuring the optical Extragalactic Background Light (EBL) we are using the shadow of a dark cloud. We have performed, with the ESO VLT/FORS, spectrophotometry of the surface brightness towards the high-galacticlatitude dark cloud Lynds 1642. A spectrum representing the difference between the opaque core of the cloud and several unobscured positions around the cloud was presented in Paper I (Mattila et al. 2017a). The topic of the present paper is the separation of the scattered starlight from the dark cloud itself which is the only remaining foreground component in this difference. While the scattered starlight spectrum has the characteristic Fraunhofer lines and the discontinuity at 400 nm, typical of integrated light of galaxies, the EBL spectrum is a smooth one without these features. As template for the scattered starlight we make use of the spectra at two semi-transparent positions. The resulting EBL intensity at 400 nm is I EBL = 2.9 ± 1.1 10 −9 erg cm −2 s −1 sr −1Å−1 or 11.6 ± 4.4 nW m −2 sr −1 , which represents a 2.6σ detection; the scaling uncertainty is +20%/-16%. At 520 nm we have set a 2σ upper limit of I EBL 4.5 10 −9 erg cm −2 s −1 sr −1Å−1 or 23.4 nW m −2 sr −1 +20%/-16% . Our EBL value at 400 nm is 2 times as high as the integrated light of galaxies. No known diffuse light sources, such as light from Milky Way halo, intracluster or intra-group stars appear capable of explaining the observed EBL excess over the integrated light of galaxies.

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“…While direct measurements of the EBL SED have been attempted, most recently by Matsuura et al (2017) and Zemcov et al (2017), correct subtraction of contaminating foregrounds is challenging, and the measurements tend to be limited by systematic uncertainties. Robust lower bounds on the EBL SED, on the other hand, have been generated by summing the light expected based on resolved galaxies.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Extragalactic Background Light Spectral Energy Distribution with VERITAS

Abeysekara

Archer

Benbow

et al. 2019

ApJ

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The extragalactic background light (EBL), a diffuse photon field in the optical and infrared range, is a record of radiative processes over the Universe's history. Spectral measurements of blazars at very high energies (>100 GeV) enable the reconstruction of the spectral energy distribution (SED) of the EBL, as the blazar spectra are modified by redshift-and energy-dependent interactions of the gamma-ray photons with the EBL. The spectra of 14 VERITAS-detected blazars are included in a new measurement of the EBL SED that is independent of EBL SED models. The resulting SED covers an EBL wavelength range of 0.56-56 µm, and is in good agreement with lower limits obtained by assuming that the EBL is entirely due to radiation from cataloged galaxies.

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New Spectral Evidence of an Unaccounted Component of the Near-infrared Extragalactic Background Light from the CIBER

Cited by 96 publications

References 61 publications

Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars

Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars

Extragalactic background light: a measurement at 400 nm using dark cloud shadow – II. Spectroscopic separation of the dark cloud’s light, and results★

Measurement of the Extragalactic Background Light Spectral Energy Distribution with VERITAS

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