Supernova-remnant origin of the Galactic-Centre filaments

Abstract

The mechanism to produce the numerous Galactic-Centre filaments (GCF) that vertically penetrate the Galactic plane without clear evidence of connection to the disc remains a mystery . Here we show that the GCFs are explained by relics of supernova remnants (rSNR) driven by hundreds of supernovae (SNe) exploded in the star-forming ring of the central molecular zone (CMZ) at an SN rate of $\sim 2\times 10^{-4}$ y${}^{-1}$ in the past $\sim 0.5$ My. The evolution of rSNRs is simulated by the propagation of fast-mode magneto-hydrodynamic (MHD) waves, which are shown to converge around the Galactic rotation axis by the focusing effect. Tangential projection of the cylindrical wave fronts on the sky constitutes the vertical filaments. The SNR model explains not only the morphology, but also the non-thermal radio spectrum, smoothed brightness over the distribution area consistent with the $\Sigma -D$ relation of SNR,and the heating mechanism of hot plasma in the GC. We also discuss the implication of the model on the study of the interstellar physics and star-formation activity in the Galactic Centre.

Accepted for MNRAS, 21 pages, 21 figures

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Cited by in corpus (4)

• The Population of the Galactic Center Filaments: Position Angle Distribution Reveal a Degree-scale Collimated Outflow from Sgr A* along the Galactic Plane
• Effects of Magnetic Fields on Gas Dynamics and Star Formation in Nuclear Rings
• The JWST-NIRCam View of Sagittarius C. II. Evidence for Magnetically Dominated HII Regions in the CMZ
• Constraining the hadronic properties of star-forming galaxies above $1\mathrm{GeV}$ with 15-years Fermi-LAT data