Russian Federation
UDC 524.62
UV absorption lines in the spectra of quasars in the corona of the Andromeda galaxy show that within ≤0.15 Mpc the hot gas (~3∙105 K) contains a dynamic fraction of warm gas (~104 K) associated with shock waves (SW). SW are formed around the halos of satellite galaxies ≤15 kpc in size and the high-velocity clouds they form, 2–15 kpc in size, with a total mass of ~7∙109 M○, settling into the Galaxy in ~109 years, covering up to 37% of the sky. The total power of the SW of ~2∙1042 erg/s is emitted in the form of UV, X-ray and gamma radiation, as well as cosmic rays, the electrons in which (≥100 MeV) are braked by the magnetic field of MHD turbulences of the SW of 3 – 7 μG, forming GHz synchrotron radio emission. Subcosmic rays (electrons ≤100 keV) can heat the coronal gas (emitting at ~0.3 keV) and form bremsstrahlung in the region of ~30 keV. These types of radiation from the era of settling of small galaxies in the coronas of larger ones at z ~ 0.45 ± 0.15 can contribute to the background cosmic radiation with a total energy density of ~10-4 eV/cm3.
galactic coronas, high-velocity clouds, plasma shock waves
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