Axion-like particles and the propagation of gamma rays over astronomical distances

Troitsky, S.

doi:10.1134/s0021364017010052

Cited by 23 publications

(13 citation statements)

References 47 publications

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“…The same range of couplings is favoured by ALP explanations of possible "anomalous transparency" effects [6,7,8,9,10] in the propagation of energetic gamma rays from distant sources [11,12,13,14,15,16,17] (for a short review, see Ref. [18]). These studies are however very sensitive to measurements of redshifts of the emitting sources, so the significance of the observed effects remains uncertain [19] and other ways to explore the relevant part of the ALP parameter space are welcome.…”

Section: Introductionmentioning

confidence: 99%

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

Libanov

Troitsky

2020

Physics Letters B

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Photons may convert to axion-like particles (ALPs) in external magnetic fields. Under certain conditions, this effect should result in irregular features in observed spectra of astrophysical sources. Lack of such irregularities in particular spectra was used to constrain ALP parameters, with two most popular sources being the radio galaxy NGC 1275 and the blazar PKS 2155−304. The effect and, consequently, the constraints, depend on the magnetic fields through which the light from the source is propagated. Here, we revisit ALP constraints from gamma-ray observations of NGC 1275 taking into account the regular magnetic field of the X-ray cavity observed around this radio galaxy. This field was not accounted for in previous studies, which assumed a model of purely turbulent fields with coherence length much smaller than the cavity size. For the purely regular field, ALP constraints are relaxed considerably, compared to the purely turbulent one. Similar arguments hold also for PKS 2155−304. While the actual magnetic field around a source is an unknown sum of the turbulent and ordered components, the difference in results gives an estimate of the theoretical uncertainty of the study and calls for detailed measurements of magnetic fields around sources used to constrain ALP properties in this approach.

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Section: Introductionmentioning

confidence: 99%

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

Libanov

Troitsky

2020

Physics Letters B

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“…The discussion of the possibility of such a significant reduction required a detailed analysis of the physical factors accounting for EBL formation. The alternative explanations of the anomalous transparency of the Universe include new physics with the hypothetical axionlike particles, see Troitsky (2017), De Angelis et al (2007), Simet et al (2008), Fairbairn et al (2011) for a review and new astrophysics Essey & Kusenko (2010), Dzhatdoev et al (2017). In the latter class of models it is assumed that addi-tional high-energy gamma-rays are produced as the secondaries in the cascades, initiated by the gamma-rays or the ultra-high-energy protons emitted at the same sources.…”

Section: Introductionmentioning

confidence: 99%

Constraining the star formation rate with the extragalactic background light

Korochkin

Рубцов

2018

Monthly Notices of the Royal Astronomical Society

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The present day spectrum of the extragalactic background light (EBL) in UV, optical and IR wavelengths is the integral result of multiple astrophysical processes going on throughout the evolution of the Universe. The relevant processes include star formation, stellar evolution, light absorption and emission by the cosmic dust. The properties of these processes are known with uncertainties which contribute to the EBL spectrum precision. In the present paper we develop a numerical model of the EBL spectrum while maintaining the explicit dependence on the astrophysical parameters involved. We constructed a Markov Chain in the parameter space by using the likelihood function built with the up-to-date upper and lower bounds on the EBL intensity. The posterior distributions built with the Markov Chain Monte Carlo method are used to determine an allowed range of the individual parameters of the model. Consequently, the star formation rate multiplication factor is constrained in the range 1.01 < C sfr < 1.69 at 68% C.L. The method also results in the bounds on the lifetime, radius, dust particle density and opacity of the molecular clouds that have large ambiguity otherwise. It is shown that there is a reasonable agreement between the model and the intensity bounds while the astrophysical parameters of the best fit model are close to their estimates from literature.

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“…Refs. [15,[21][22][23] for recent reviews. A range of approaches are based on the ALP-photon mixing in external magnetic fields [24], which results in the ALP-photon oscillations, the ALP Primakoff effect and vacuum birefringence.…”

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confidence: 99%

Constraining the photon coupling of ultra-light dark-matter axion-like particles by polarization variations of parsec-scale jets in active galaxies

Ivanov

Kovalev

Lister

et al. 2019

J. Cosmol. Astropart. Phys.

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Ultra-light dark matter may consist of axion-like particles with masses below 10 −19 eV. Two-photon interactions of these particles affect the polarization of radiation propagating through the dark matter. Coherent oscillations of the Bose condensate of the particles induce periodic changes in the plane of polarisation of emission passing through the condensate. We estimate this effect and analyze MOJAVE VLBA polarization observations of bright downstream features in the parsec-scale jets of active galaxies. Through the nonobservation of periodic polarization changes, we are able to constrain the photon coupling of the ultra-light dark-matter axion-like particles at the level of 10 −12 GeV −1 for masses between ∼ 5 × 10 −23 eV and ∼ 1.2 × 10 −21 eV.

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Axion-like particles and the propagation of gamma rays over astronomical distances

Cited by 23 publications

References 47 publications

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources

Constraining the star formation rate with the extragalactic background light

Constraining the photon coupling of ultra-light dark-matter axion-like particles by polarization variations of parsec-scale jets in active galaxies

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