Gammapy - A prototype for the CTA science tools

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

doi:10.48550/arxiv.1709.01751

Cited by 8 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A low diffusion coefficient exacerbates this problem, confining electrons to a smaller region around their sources within their cooling time. Figure 1 explores this effect quantitatively using a simple population model from the gammapy package [15] assuming a supernova rate of 3 per century. There sources were distributed using the radial distribution described in [16] with the velocity distribution and spiral arms used by [17].…”

Section: Introductionmentioning

confidence: 99%

Undiscovered Pulsar in the Local Bubble as an Explanation of the Local High Energy Cosmic Ray All-Electron Spectrum

et al. 2018

View full text Add to dashboard Cite

Cosmic ray electrons and positrons are tracers of particle propagation in the interstellar medium (ISM). A recent measurement performed using H.E.S.S. extends the all-electron (electron+positron) spectrum up to 20 TeV, probing very local sources and transport due to the ∼10 kyr cooling time of these particles. An additional key local measurement was the recent estimation of the ISM diffusion coefficient around Geminga performed using HAWC. The inferred diffusion coefficient is much lower than typically assumed values. It has been argued that if this diffusion coefficient is representative of the local ISM, pulsars would not be able to account for the all-electron spectrum measured at the Earth. Here we show that a low diffusion coefficient in the local ISM is compatible with a pulsar wind nebula origin of the highest energy electrons, if a so far undiscovered pulsar with spin-down power ∼ 10 33−34 erg/s exists within 30 to 80 pc of the Earth. The existence of such a pulsar is broadly consistent with the known population and may be detected in near future survey observations.

show abstract

Section: Introductionmentioning

confidence: 99%

Undiscovered Pulsar in the Local Bubble as an Explanation of the Local High Energy Cosmic Ray All-Electron Spectrum

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The VERITAS collaboration has collected ∼ 180 h of exposure per source, spanning from 2008 to 2021. VERITAS data are pre-analyzed using collaboration standard packages [4,5] to reduce data to DL3 products and then higher-level products such as spectra or lightcurves are produced using gammapy [6,7]. VERITAS data are combined with Fermi-LAT, Swift-XRT and Swift-UVOT.…”

Section: Discussionmentioning

confidence: 99%

Characterizing the VHE emission of the extreme HBLs 1ES 1218+304 and 1ES 0229+200 with VERITAS

Batista¹

2023

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

View full text Add to dashboard Cite

The modelling of the spectral energy distribution (SED) of some high-frequency peaked BL Lac objects (HBLs) has proved challenging for the so-called extreme candidates, which can have their TeV peak at energies >1 TeV and a hard intrinsic TeV spectrum of Γ < 2. The HBLs 1ES 1218+304 (z=0.182) and 1ES 0229+200 (z=0.1396) are two characteristic examples. Historically, leptonic one-zone synchrotron self-Compton (SSC) models have been used when modelling the broadband SED of BL Lac objects with relative success, but they fail to fully describe the emission of their extreme counterparts without requiring unexpectedly large or small physical quantities, or reaching far beyond the equipartition condition, when accounting for extragalactic background light (EBL). In this work, using archival VERITAS data from 2008 to 2021 on 1ES 1218+304 and 1ES 0229+200 combined with data from the Swift-XRT and Fermi-LAT observatories for extended wavelength coverage, we provide an updated look on the modelling of extreme HBLs.

show abstract

“…data and will be of prime interest for CTA. They will be implemented in the analysis softwares of CTA : ctools (Knödlseder et al 2016) and gammapy (Deil et al 2017). The performance of the methods described in this publication applied to CTA analysis and for more realistic cases will be estimated in a forthcoming publication.…”

Section: Discussionmentioning

confidence: 99%

Analysis methods to search for transient events in ground-based very high energy γ-ray astronomy

Brun

Piel

Naurois

et al. 2020

Astroparticle Physics

View full text Add to dashboard Cite

Transient and variable phenomena in astrophysical sources are of particular importance to understand the underlying gamma-ray emission processes. In the very-high energy gamma-ray domain, transient and variable sources are related to charged particle acceleration processes that could for instance help understanding the origin of cosmic-rays. The imaging atmospheric Cherenkov technique used for gamma-ray astronomy above ∼ 100 GeV is well suited for detecting such events. However, the standard analysis methods are not optimal for such a goal and more sensitive methods are specifically developed in this publication. The sensitivity improvement could therefore be helpful to detect brief and faint transient sources such as Gamma-Ray Bursts.

show abstract

Gammapy - A prototype for the CTA science tools

Cited by 8 publications

References 12 publications

Undiscovered Pulsar in the Local Bubble as an Explanation of the Local High Energy Cosmic Ray All-Electron Spectrum

Undiscovered Pulsar in the Local Bubble as an Explanation of the Local High Energy Cosmic Ray All-Electron Spectrum

Characterizing the VHE emission of the extreme HBLs 1ES 1218+304 and 1ES 0229+200 with VERITAS

Analysis methods to search for transient events in ground-based very high energy γ-ray astronomy

Contact Info

Product

Resources

About