Journal Article

PUBDB-2023-06235

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3

Burger-Scheidlin, C. ; Brose, R. ; Mackey, J. ; Filipovic, M. D. ; Goswami, P. ; Guillen, E. M. ; de Ona Wilhelmi, E. M. (Corresponding author)DESY* ; Sushch, I.

2024
EDP Sciences Les Ulis

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Please use a persistent id in citations: doi:10.1051/0004-6361/202348348  doi:10.3204/PUBDB-2023-06235

Report No.: arXiv:2310.14431

Abstract: The supernova remnant (SNR) G288.8-6.3 was recently discovered as a faint radio shell at large Galactic latitude using observations with ASKAP in the EMU survey. Here, we make the first detailed investigation of the $\gamma$-ray emission from the G288.8-6.3 region, aiming to characterise the high-energy emission in the GeV regime from the newly discovered SNR, dubbed Ancora. 15 years of Fermi-Large Area Telescope (LAT) data were analysed at energies between 400 MeV and 1 TeV and the excess seen in the region was modelled using different spatial and spectral models. We detect spatially extended $\gamma$-ray emission coinciding with the radio SNR, with detection significance up to 8.8 $\sigma$. A radial disk spatial model in combination with a power-law spectral model with an energy flux of $(4.80 \pm 0.91) \times 10^{-6}$$\text{MeV}$$\text{cm}^{-2}$$\text{s}^{-1}$, with the spectrum extending up to around 5 GeV was found to be the preferred model. Morphologically, hotspots seen above 1 GeV are well-correlated with the bright western part of the radio shell. The emission is more likely to be of leptonic origin given the estimated gas density in the region and the estimated distance and age of the SNR, but a hadronic scenario cannot be ruled out. Ancora is the eighth SNR detected at high Galactic latitude with Fermi-LAT. This new population of remnants has the potential to constrain the physics of particle diffusion and escape from SNRs into the Galaxy.

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Contributing Institute(s):

1. Gammaastronomie (Z_GA)
2. Theoretische Astroteilchenphysik (Z_THAT)
3. High Energy Steroscopic System (Z_HESS)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. The Fermi Large Area Telescope

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Burger-Scheidlin, C. (Corresponding author) ; Brose, R. ; Mackey, J. ; Filipovic, M. D. ; Goswami, P. ; Guillen, E. M. ; de Oña Wilhelmi, E.DESY* ; Sushch, I.
Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3
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