Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources

Abdollahi, S.; Acero, Fabio; Ackermann, M.; Baldini, Luca; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Berenji, B.; Berretta, A.; Bissaldi, E.; Blandford, R. D.; Bonino, R.; Bruel, Pascal; Buson, S.; Cameron, R. A.; Caputo, R.; Caraveo, P. A.; Castro, Daniel; Chiaro, G.; Cibrario, N.; Ciprini, S.; Coronado-Blázquez, Javier; Crnogorcevic, M.; Cutini, S.; D’Ammando, F.; Gaetano, S. De; Lalla, N. Di; Dirirsa, F.; Venere, L. Di; Domínguez, A.; Fegan, S. J.; Fiori, A.; Fleischhack, Henrike; Franckowiak, A.; Fukazawa, Yasushi; Fusco, P.; Gammaldi, Viviana; Gargano, F.; Gasparrini, D.; Giacchino, F.; Giglietto, N.; Giordano, F.; Giroletti, M.; Glanzman, T.; Green, D.; Grenier, I. A.; Grondin, M.‐H.; Guiriec, S.; Gustafsson, M.; Harding, A. K.; Hays, E.; Hewitt, John W.; Horan, D.; Hou, X.; Jóhannesson, G.; Kayanoki, Taishu; Kerr, M.; Kuss, M.; Larsson, Stefan; Latronico, L.; Lemoine‐Goumard, M.; Li, J.; Longo, F.; Loparco, F.; Lubrano, P.; Maldera, S.; Malyshev, D.; Manfreda, Alberto; Martí-Devesa, G.; Mazziotta, M. N.; Mereu, I.; Michelson, P. F.; Mirabal, N.; Mitthumsiri, W.; Mizuno, T.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Nuss, E.; Omodei, N.; Orienti, M.; Orlando, Elena; Ormes, J. F.; Paneque, D.; Pei, Z. Y.; Peršić, M.; Pesce-Rollins, M.; Pillera, Roberta; Poon, H.; Porter, T. A.; Principe, G.; Rainò, S.; Rando, R.; Rani, Bindu; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Reposeur, T.; Parkinson, P. Saz; Scotton, L.; Serini, D.; Sgrò, C.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Sueoka, Kentaro; Suson, D. J.; Tajima, H.; Tak, D.; Thayer, J. B.; Torres, D. F.; Troja, E.; Valverde, J.; Wadiasingh, Zorawar; Wood, K.; Zaharijaš, Gabrijela

doi:10.3847/1538-4357/ac704f

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…where δ = 1.05±0.22 is a curvature parameter, Γ 1 = 2.64±0.09 and Γ 2 = 1.19±0.06 (also consistent with [18]) are the spectral indexes above and below the pivot energy E b = 0.50 ± 0.08 GeV, and the best fit integrated energy flux is (11.0 ± 0.5) × 10 −5 erg cm −2 s −1 . Dedicated fits on the LE and HE datasets display compatible results.…”

Section: Pos(gamma2022)058supporting

confidence: 69%

The 2020 periastron of Eta Carinae at high-energies

Martí-Devesa¹,

Reimer²

2023

Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy — PoS(Gamma2022)

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Colliding-wind binaries are massive stellar systems featuring strong, interacting stellar winds. The resulting shocks may act as effective particle accelerators, making them good candidates for detection at high energies. However, only the massive binary η Carinae (with an orbital period of ∼ 5.5 years) has been firmly identified as a γ-ray source. A second system, γ 2 Velorum, was found positionally coincident with a γ-ray signal, with solid evidence of orbital variability along its orbit. Thus massive binaries are a promising, emerging class of high-energy emitters. However, the origin of the non-thermal emission in η Carinae is still unclear, with both leptonic and hadronic scenarios currently under discussion. Moreover, γ-ray fluxes differ between the two periastrons previously observed by the Fermi Large Area Telescope (Fermi LAT). Here we report the analysis of the 2020 periastron, together with a complete analysis of more than two orbits, allowing the first orbit-to-orbit variability study of η Carinae at GeV energies. We discuss these results in the context of previous hard X-ray (NuSTAR) and very-high-energy (H.E.S.S.) observational results. This new analysis provides highly valuable information for the radiative scenarios and the conditions of the wind-collision region.

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Section: Pos(gamma2022)058supporting

confidence: 69%

The 2020 periastron of Eta Carinae at high-energies

Martí-Devesa¹,

Reimer²

2023

Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy — PoS(Gamma2022)

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“…In addition to performing a spectral fit over the entire energy range, we computed an SED for each of these 56 sources by fitting the flux of the source independently in 10 logarithmically spaced energy bins from 50 MeV to 1 GeV. All SEDs and spectral fits are published in [7].…”

Section: Pos(gamma2022)043mentioning

confidence: 99%

“…Here, we use 8 years of Pass 8 data to analyse 311 Galactic sources detected in the 4FGL catalog and search for significant spectral breaks between 50 MeV and 1 GeV. The analysis and the results are fully described in [7].…”

Section: Introductionmentioning

confidence: 99%

New cosmic-ray acceleration sites detected by the Fermi-LAT in our Galaxy

Lemoine‐Goumard¹,

Ballet²,

Reposeur³

2023

Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy — PoS(Gamma2022)

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Cosmic rays are mostly composed by protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions which in turn decay into gamma rays. This offers a compelling way to identify the acceleration sites of protons. A characteristic hadronic spectrum was detected in the gamma-ray spectra of four Supernova Remnants (SNRs), IC 443, W44, W49B, and W51C, with the Fermi Large Area Telescope. This detection provided direct evidence that cosmic-ray protons are (re-)accelerated in SNRs. In this review, we present the results from a comprehensive search for low energy spectral breaks. We use 8 years of data from the Fermi Large Area Telescope between 50 MeV and 1 GeV. This search is based on the 4FGL catalog from which we extracted the unidentified sources or those associated to SNRs with a significance above 3 sigma at low energy in both cases. Several SNRs, binaries and one star forming region as well as a handful of unidentified sources are detected with our search. We present these best candidates, focusing on the most intriguing cases such as Eta Carinae and the Cygnus star forming region, thus enlarging our view to potential new cosmic-ray acceleration sites.

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IceCube results and perspective for neutrinos from LHAASO sources

Fang,

Halzen

2024

Journal of High Energy Astrophysics

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Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources

Cited by 7 publications

References 41 publications

The 2020 periastron of Eta Carinae at high-energies

The 2020 periastron of Eta Carinae at high-energies

New cosmic-ray acceleration sites detected by the Fermi-LAT in our Galaxy

IceCube results and perspective for neutrinos from LHAASO sources

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