Wang, QDImmler, SWalterbos, RLauroesch, JTBreitschwerdt, D2024-04-262024-04-262001-01-01https://doi.org/10.1086/323179https://hdl.handle.net/20.500.14394/2664<p>This is the pre-published version harvested from ArXiv. The published version is located at <a href="http://iopscience.iop.org/1538-4357/555/2/L99/">http://iopscience.iop.org/1538-4357/555/2/L99/</a></p>We present a Chandra X-ray observation that shows, unambiguously for the first time, the presence of a giant diffuse X-ray-emitting corona around the edge-on disk galaxy NGC 4631. This corona, with a characteristic thermal temperature of × 106 K, extends as far as 8 kpc away from the galactic plane. The X-ray morphology resembles the radio halo of the galaxy, indicating a close connection between outflows of hot gas, cosmic rays, and the magnetic field from the galactic disk. Enhanced diffuse X-ray emission is apparently enclosed by numerous Hα-emitting loops blistered out from the central disk of the galaxy, as is evident in a comparison with our deep Hubble Space Telescope imaging.galaxies: individual (NGC 4631); galaxies: ISM; galaxies: spiral; X-rays: galaxiesAstrophysics and Astronomyarticle