Searching for the possible signal of the photon-axionlike particle oscillation in the combined GeV and TeV spectra of supernova remnants

Xia, Zi-Qing; Liang, Yun-Feng; Liu, Feng; Yuan, Qiang; Fan, Yi-Zhong; Wu, Jian

doi:10.1103/physrevd.100.123004

Cited by 20 publications

(19 citation statements)

References 79 publications

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“…Expanding their previous work, [80], Xia et al [81] performed a search for spectral irregularities in three galactic supernova remnants, combining GeV data from Fermi-LAT and TeV data from IACTs (H.E.S.S., MAGIC and VERITAS). The broadband spectra were fitted with models with and without photon-ALP conversion in the galactic magnetic field.…”

Section: Supernova Remnantsmentioning

confidence: 99%

“…The ALP hypothesis was tested using the χ 2 analysis and the combined limits were again shown to be inconsistent with limits already set by CAST. The authors speculated that a possible reason for this result could be the uncertain connection between the Fermi-LAT spectrum and the IACT observations, which are not easily calibrated in energy, and also the systematic uncertainties of the instruments that were not taken into account [81]. This approach is likely to be revisited once CTA start taking data.…”

Section: Supernova Remnantsmentioning

confidence: 99%

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Axion-like Particle Searches with IACTs

et al. 2021

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The growing interest in axion-like particles (ALPs) stems from the fact that they provide successful theoretical explanations of physics phenomena, from the anomaly of the CP-symmetry conservation in strong interactions to the observation of an unexpectedly large TeV photon flux from astrophysical sources, at distances where the strong absorption by the intergalactic medium should make the signal very dim. In this latter condition, which is the focus of this review, a possible explanation is that TeV photons convert to ALPs in the presence of strong and/or extended magnetic fields, such as those in the core of galaxy clusters or around compact objects, or even those in the intergalactic space. This mixing affects the observed γ-ray spectrum of distant sources, either by signal recovery or the production of irregularities in the spectrum, called `wiggles’, according to the specific microscopic realization of the ALP and the ambient magnetic field at the source, and in the Milky Way, where ALPs may be converted back to γ rays. ALPs are also proposed as candidate particles for the Dark Matter. Imaging Atmospheric Cherenkov telescopes (IACTs) have the potential to detect the imprint of ALPs in the TeV spectrum from several classes of sources. In this contribution, we present the ALP case and review the past decade of searches for ALPs with this class of instruments.

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Section: Supernova Remnantsmentioning

confidence: 99%

Section: Supernova Remnantsmentioning

confidence: 99%

Axion-like Particle Searches with IACTs

et al. 2021

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“…[16], the best-fit region from the PSR analysis remains still viable (red contours in Fig. 7 of [23]). Ref.…”

Section: Bounds On Alp-photon Couplingmentioning

confidence: 96%

“…As for Galactic sources, as mentioned above, Ref. [23] derived 95% C.L. limits on the ALPs parameter space based on the combined analysis of three supernova remnants.…”

Section: Bounds On Alp-photon Couplingmentioning

confidence: 99%

Reconciling hints on axion-like-particles from high-energy gamma rays with stellar bounds

Gautham

Calore

Giannotti

et al. 2021

J. Cosmol. Astropart. Phys.

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It has been recently claimed by two different groups that the spectral modulation observed in gamma rays from Galactic pulsars and supernova remnants can be due to conversion of photons into ultra-light axion-like-particles (ALPs) in large-scale Galactic magnetic fields. While we show the required best-fit photon-ALP coupling, gaγ ∼ 2 × 10-10 GeV-1, to be consistent with constraints from observations of photon-ALPs mixing in vacuum, this is in conflict with other bounds, specifically from the CAST solar axion limit, from the helium-burning lifetime in globular clusters, and from the non-observations of gamma rays in coincidence with SN 1987A. In order to reconcile these different results, we propose that environmental effects in matter would suppress the ALP production in dense astrophysical plasma, allowing to relax previous bounds and make them compatible with photon-ALP conversions in the low-density Galactic medium. If this explanation is correct, the claimed ALP signal would be on the reach of next-generations laboratory experiments such as ALPS II.

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“…Though the ALP effects in VHE range have been widely studied (see also [30][31][32] for other works on ALPs in TeV energies for both Galactic and extragalactic sources), all the above-mentioned works are based on resolved TeV sources beyond the detection threshold. In this paper, we show that the ALP-photon conversion can also cause an observable modification to the spectrum of the diffuse extragalactic gamma-ray background (EGB) in the > 100 GeV energy range.…”

Section: Introductionmentioning

confidence: 99%

Effect of axion-like particles on the spectrum of the extragalactic gamma-ray background

Liang,

Zhang,

Cheng

et al. 2020

Preprint

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Axion-like particles (ALPs) provide a feasible explanation for the observed low TeV opacity of the Universe. If the low TeV opacity is caused by ALP, then the > TeV fluxes of unresolved extragalactic point sources will be correspondingly enhanced, resulting in an enhancement of the observed EGB spectrum at high energies. In this work, we for the first time investigate the ALP effect on the EGB spectrum. Our results show that the existence of ALPs can cause the EGB spectrum to deviate from a pure EBL absorption case. The deviation occurs at about ∼1 TeV and current EGB measurements by Fermi-LAT cannot identify such an effect. The observation from forthcoming VHE instruments like LHAASO and CTA may be useful for studying this effect. We find that although most of the sensitive ALP parameters have been ruled out by existing ALP results, some unrestricted parameters could be probed with the EGB observation around 10 TeV.

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Searching for the possible signal of the photon-axionlike particle oscillation in the combined GeV and TeV spectra of supernova remnants

Cited by 20 publications

References 79 publications

Axion-like Particle Searches with IACTs

Axion-like Particle Searches with IACTs

Reconciling hints on axion-like-particles from high-energy gamma rays with stellar bounds

Effect of axion-like particles on the spectrum of the extragalactic gamma-ray background

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