Gammapy - A prototype for the CTA science tools

Lefaucheur, J.; Deil, C.; Zanin, R.; Boisson, C.; Khélifi, B.; Terrier, Réegis; Wood, M.; Mohrmann, L.; Chakraborty, Nachiketa; Watson, Jason; López-Coto, R.; Klepser, S.; Cerruti, M.; Lenain, Jean-Philippe; Acero, Fabio; Djannati‐Ataï, A.; Pita, S.; Bošnjak, Željka; Trichard, C.; Vuillaume, Thomas; Donath, Axel; King, Johannes; Jouvin, L.; Owen, Ellis R.; Sipőcz, Brigitta; Lennarz, D.; Voruganti, Arjun; Spir-Jacob, Marion; Ruíz, José Enrique; Arribas, M. Paz

doi:10.22323/1.301.0766

Cited by 48 publications

(26 citation statements)

References 11 publications

(17 reference statements)

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“…Flare data from both Fermi-LAT and VERITAS was pre-processed in their respective analysis packages [6,7] and imported into the gammapy [8,9] gamma-ray analysis package for a joint spectral analysis. The null hypothesis models the intrinsic spectrum (Φ 𝑖𝑛𝑡 ) as an exponentially cut-off power law, and includes EBL effects such that Φ 𝑜𝑏𝑠,𝑛𝑢𝑙𝑙 (𝐸, 𝑧) = 𝑒 − 𝜏 (𝐸,𝑧) Φ 𝑖𝑛𝑡 (𝐸), where 𝜏(𝐸, 𝑧) is the EBL optical depth from [2].…”

Section: Data Collection and Methodsmentioning

confidence: 99%

Search for Axion-Like Particles with Observations of the Blazar Markarian 421 with VERITAS and Fermi-LAT

Adams¹

2023

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

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Axion-like particles (ALPs) are light, pseudoscalar particles that are a beyond-the-standard-model generalization of the axion. Consequently, they are expected to couple to photons in external magnetic fields to compensate for spin difference. This coupling would induce modifications to the gamma-ray spectra of astrophysical sources, such as blazars, via ALP-photon oscillations in external fields near the source and in the Galactic magnetic field. In this contribution, we explore ALP-photon oscillation effects in the spectrum of the blazar Markarian 421. This work was performed using observations of an exceptional gamma-ray flare state from VERITAS and Fermi-LAT. Using these observations, we investigate constraints on the two parameters defining the ALP, namely its mass and coupling constant.

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Section: Data Collection and Methodsmentioning

confidence: 99%

Search for Axion-Like Particles with Observations of the Blazar Markarian 421 with VERITAS and Fermi-LAT

Adams¹

2023

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

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“…𝛾 ray-like events have been selected using a multivariate analysis technique [12] and reconstructed with the ImPACT algorithm [13]. For the high-level analysis, we employed the Gammapy package (v0.17) [14,15] to carry out a three-dimensional likelihood analysis. To model the residual background of cosmic ray-induced air shower events, we utilised the approach outlined in [16].…”

Section: Hess Data Set and Analysismentioning

confidence: 99%

Young massive stellar clusters as cosmic-ray sources: the case of Westerlund 1

Mohrmann¹

2023

Proceedings of 27th European Cosmic Ray Symposium — PoS(ECRS)

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Young massive stellar clusters are increasingly discussed as major contributors to the flux of Galactic cosmic rays. Westerlund 1, being the most massive young stellar cluster in the Milky Way, is a prime target to study in this regard. We present results from deep observations of the region around Westerlund 1 in very-high-energy gamma rays with the H.E.S.S. array of Cherenkov telescopes. We observe a large-scale (∼2 • diameter) emission region with a shell-like structure, extending far beyond the stellar cluster itself. No indications for a variation of the source morphology with energy could be found, the combined energy spectrum extends to several tens of TeV. Apart from Westerlund 1, no other potential counterparts were found that can be responsible for the bulk of the gamma-ray emission. We discuss various different explanations for the origin of the gamma-ray emission, considering both cosmic-ray acceleration at shock fronts within the cluster as well as scenarios related to the powerful combined cluster wind. *** 27th European Cosmic Ray Symposium -ECRS *** *** 25-29 July 2022 *** *** Nijmegen, the Netherlands *** * Speaker

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“…The LST-1 high-level data (gamma-ray candidates with reconstructed energy and direction) was processed with the official high-level data framework for CTA, Gammapy [11], to produce the energy spectra and light curve of RS Oph.…”

Section: Rs Ophiuchi Nova Outburst Detection By the Lst-1mentioning

confidence: 99%

RS Ophiuchi nova outburst detection by the LST-1

Aguasca-Cabot¹,

Abe²,

Abe³

et al. 2023

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

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The recurrent symbiotic nova RS Ophiuchi experienced an outburst in August 2021 that was detected at optical and high-energy gamma rays. This triggered follow-up observations of the source at very-high-energy gamma rays with the first Large Size Telescope (LST-1) of the Cherenkov Telescope Array. RS Ophiuchi was observed for several nights after the outburst and it was clearly detected by LST-1. Here we report on the outcomes of this observation campaign of the first nova ever detected at very high energies.

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Gammapy - A prototype for the CTA science tools

Cited by 48 publications

References 11 publications

Search for Axion-Like Particles with Observations of the Blazar Markarian 421 with VERITAS and Fermi-LAT

Search for Axion-Like Particles with Observations of the Blazar Markarian 421 with VERITAS and Fermi-LAT

Young massive stellar clusters as cosmic-ray sources: the case of Westerlund 1

RS Ophiuchi nova outburst detection by the LST-1

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