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

Abstract

Supernova remnant (SNR) detection along the Galactic plane poses a number of challenges. The SNR G309.8+00.0 lies exactly on the Galactic plane, with its center coinciding with galactic latitude (b)=0 deg. In this paper we report the first detection of the SNR G309.8+00.0 in X-rays and $\gamma$ rays, using stacked data from the first four consecutive extended ROentgen Survey Imaging Telescope Array (eROSITA) -- on board the Russian-German Spektrum Roentgen Gamma (SRG) -- all-sky surveys (eRASS:4) and $\sim 15.5$ yr of Pass 8 data recorded from Fermi-LAT, respectively. The SNR appears to have an elliptical shape of 0.43 x 0.32 deg in size in both radio synchrotron and X-ray data. The SNR's emission exhibits a shell-like morphology and good spatial correlation in both energy bands. The X-ray emission was solely detected in the 1-2 keV energy band (subject to strong absorption at soft X-rays) and the spectral analysis results of eRASS:4 data present a purely thermal SNR with a high absorption column density $3.1_{-0.5}^{+0.7}\cdot 10^{22}\mathrm{c}{\mathrm{m}}^{-2}$ and a temperature of $0.34\pm 0.1$ keV. In combination with optical extinction data, the absorption column density values derived from the remnant's spectral analysis support a remnant's distance greater than 6 kpc, rather than a 3.12 kpc distance as reported in the literature, and yield an age of $1-3.5\cdot 10^5$ yr. Employing $\sim 15.5$ yr of Fermi-LAT $\gamma$-ray data at and around the remnant's vicinity, we confirm the detection of the to-date unidentified 4FGL J1349.5-6206c source that can either be modeled as a single source or a conglomerate of multiple distinct source components and we argue that the SNR G309.8+00.0 likely represents at least a significant portion (if not all) of the emission from the 4FGL J1349.5-6206c $\gamma$-ray source.

arXiv commentAccepted for publication in Astronomy & Astrophysics on June 5. 2024, 11 pages, 7 figures

References in corpus (31)

• On the Absorption of X-rays in the Interstellar Medium
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• Fermi Large Area Telescope Second Source Catalog
• Fermi Large Area Telescope First Source Catalog
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• The eROSITA X-ray telescope on SRG
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• A Full-Sky H-alpha Template for Microwave Foreground Prediction
• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• The H.E.S.S. Galactic plane survey
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• The eROSITA Final Equatorial Depth Survey (eFEDS): The X-ray catalog
• The 1st Fermi Lat Supernova Remnant Catalog
• A Census of High-Energy Observations of Galactic Supernova Remnants
• Updated Gaia-2MASS 3D maps of Galactic interstellar dust
• ASMOOTH: A simple and efficient algorithm for adaptive kernel smoothing of two-dimensional imaging data
• The imprint of a symbiotic binary progenitor on the properties of Kepler's supernova remnant
• Probing X-ray Absorption and Optical Extinction in the Interstellar Medium Using Chandra Observations of Supernova Remnants
• The radio surface brightness to diameter relation for galactic supernova remnants: sample selection and robust analysis with various fitting offsets
• Population study of Galactic supernova remnants at very high $\gamma$-ray energies with H.E.S.S.
• Dense, Fe-rich Ejecta in Supernova Remnants DEM L238 and DEM L249: A New Class of Type Ia Supernova?
• A Python Calculator for Supernova Remnant Evolution
• A search for new supernova remnant shells in the Galactic plane with H.E.S.S
• Suzaku View of the Supernova Remnant RCW 86: X-Ray Studies of Newly-Discovered Fe-Rich Ejecta
• Distances to the Supernova Remnants in the Inner Disk
• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• Study of X-ray emission from the S147 nebula by SRG/eROSITA: supernova-in-the-cavity scenario
• X-ray counterpart detection and gamma-ray analysis of the SNR G279.0+01.1 with eROSITA and Fermi-LAT
• Study of X-ray emission from the S147 nebula with SRG/eROSITA: X-ray imaging, spectral characterization, and a multiwavelength picture