Study of X-ray emission from the S147 nebula by SRG/eROSITA: supernova-in-the-cavity scenario

Abstract

The Simeis~147 nebula (S147), particularly well known for a spectacular net of ${\mathrm{H}}_{\alpha }$-emitting filaments, is often considered one of the largest and oldest known supernova remnants in the Milky Way. Here, and in a companion paper, we present studies of X-ray emission from the S147 nebula using the data of SRG/eROSITA All-Sky Survey observations. In this paper, we argue that many inferred properties of the X-ray emitting gas are broadly consistent with a scenario of the supernova explosion in a low-density cavity, e.g. a wind-blown-bubble. This scenario assumes that a $\sim 20{\mathrm{M}}_{\odot }$ progenitor star has had small velocity with respect to the ambient ISM, so it stayed close to the center of a dense shell created during its Main Sequence evolution till the moment of the core-collapse explosion. The ejecta first propagate through the low-density cavity until they collide with the dense shell, and only then the reverse shock goes deeper into the ejecta and powers the observed X-ray emission of the nebula. The part of the remnant inside the dense shell remains non-radiative till now and, plausibly, in a state with $T_e<T_i$ and Non-Equilibrium Ionization (NEI). On the contrary, the forward shock becomes radiative immediately after entering the dense shell, and, being subject to instabilities, creates a characteristic "foamy" appearance of the nebula in ${\mathrm{H}}_{\alpha }$ and radio emission.

submitted to A&A, 12 pages, 13 figures

References in corpus (14)

• PLUTO: a Numerical Code for Computational Astrophysics
• The eROSITA X-ray telescope on SRG
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• The Origin and Motion of PSR J0538+2817 in S147
• Wind bubbles within H II regions around slowly moving stars
• Cosmic ray production in supernovae
• Radio spectral properties and the magnetic field of the SNR S147
• Electron-Ion Temperature Ratio in Astrophysical Shocks
• SRG/eROSITA discovery of a large circular SNR candidate G116.6-26.1: SN Ia explosion probing the gas of the Milky Way halo?
• SRG/eROSITA discovery of a radio faint X-ray candidate supernova remnant SRGe J003602.3+605421=G121.1-1.9
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• High resolution H-alpha imaging of the Northern Galactic Plane, and the IGAPS images database
• Kinematics of OB Stars with Data from the LAMOST and Gaia Catalogues
• Study of X-ray emission from the S147 nebula with SRG/eROSITA: X-ray imaging, spectral characterization, and a multiwavelength picture

Cited by in corpus (6)

• North Polar Spur: gaseous plume(s) from star-forming regions at $\sim$3-5 kpc from Galactic Center?
• X-ray panorama of the SS433/W50 complex by SRG/eROSITA
• Study of X-ray emission from the S147 nebula with SRG/eROSITA: X-ray imaging, spectral characterization, and a multiwavelength picture
• The environment of TeV halo progenitors
• A look at the high energy aspects of the supernova remnant G309.8+00.0 with eROSITA and Fermi-LAT
• Perseus cluster in its X-ray entirety with SRG/eROSITA. Merger and Radio-Uroboroses