X-ray counterpart detection and gamma-ray analysis of the SNR G279.0+01.1 with eROSITA and Fermi-LAT

Abstract

A thorough inspection of known Galactic Supernova Remnants (SNRs) along the Galactic plane with SRG/eROSITA yielded the detection of the X-ray counterpart of the SNR G279.0+01.1. The SNR is located just 1.5 deg above the Galactic plane. Its X-ray emission emerges as an incomplete, partial shell of $\sim$3 deg angular extension. It is strongly correlated to the fragmented shell-type morphology of its radio continuum emission. The X-ray spatial morphology of the SNR seems to be linked to the presence of dust clouds in the surroundings. The majority of its X-ray emission is soft (exhibiting strong O, Ne and Mg lines), and occurs in a narrow range of energies between 0.3 and 1.5 keV. Above 2.0 keV the remnant remains undetected. The remnant's X-ray spectrum is of purely thermal nature. Constraining the X-ray absorption column to values which are consistent with optical extinction data from the remnant's location favours non-equilibrium over equilibrium models. A non-equilibrium two-temperature plasma model of $\mathrm{kT}\sim 0.3$~keV and $\mathrm{kT}\sim 0.6$~keV, and an absorption column density of ${\mathrm{N}}_{\mathrm{H}}\sim 0.3\mathrm{c}{\mathrm{m}}^{-2}$ describes the spectrum of the entire remnant well. Significant temperature variations across the remnant have been detected. Employing 14.5 years of Fermi-LAT data, we carried out a comprehensive study of the extended GeV source 4FGL J1000.0-5312e. By refining and properly modeling the GeV excess originating from the location of the remnant, we conclude that the emission is likely related to the remnant itself rather than being co-located by chance. We also discuss implications of the new X-ray data to the estimates of the distance and age of the remnant.

References in corpus (14)

• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant
• Updated Gaia-2MASS 3D maps of Galactic interstellar dust
• Dense, Fe-rich Ejecta in Supernova Remnants DEM L238 and DEM L249: A New Class of Type Ia Supernova?
• X-ray Emitting Ejecta in Puppis A Observed with Suzaku
• Optical Structure and Proper-Motion Age of the Oxygen-rich Supernova Remnant 1E 0102-7219 in the Small Magellanic Cloud
• TeV cosmic ray nuclei acceleration in shell-type supernova remnants with hard $\gamma$-ray spectra
• First detection of optical light from SNR G279.0+1.1
• Global Distribution of Ionizing and Recombining Plasmas in the Supernova Remnant G290.1$-$0.8
• The Distance Measurements of Supernova Remnants in The Fourth Galactic Quadrant
• Tracking down the origin of superbubbles and supergiant shells in the Magellanic Clouds with Minkowski tensor analysis
• G279.0+1.1: a new extended source of high-energy gamma rays

Cited by in corpus (1)

• A look at the high energy aspects of the supernova remnant G309.8+00.0 with eROSITA and Fermi-LAT