TY  - JOUR
AU  - Burger-Scheidlin, Christopher
AU  - Brose, Robert
AU  - Mackey, Jonathan
AU  - Filipovic, Miroslav D.
AU  - Goswami, Pranjupriya
AU  - Guillen, Enrique Mestre
AU  - de Ona Wilhelmi, Emma Maria
AU  - Sushch, Iurii
TI  - Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3
JO  - Astronomy and astrophysics
VL  - 684
IS  - arXiv:2310.14431
SN  - 0004-6361
CY  - Les Ulis
PB  - EDP Sciences
M1  - PUBDB-2023-06235
M1  - arXiv:2310.14431
SP  - A150
PY  - 2024
AB  - 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 γ-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 γ-ray emission coinciding with the radio SNR, with detection significance up to 8.8 σ. A radial disk spatial model in combination with a power-law spectral model with an energy flux of (4.80 ±0.91) ×10<sup>−6</sup>\textMeV\textcm<sup>−2</sup>\texts<sup>−1</sup>, 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001207572900006
DO  - DOI:10.1051/0004-6361/202348348
UR  - https://bib-pubdb1.desy.de/record/596710
ER  -