Extended soft X-ray emission from NGC 4151

Astronomy and Astrophysics – Astrophysics

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Galactic Nuclei, Galactic Radiation, Interstellar Gas, Seyfert Galaxies, Shock Heating, X Ray Sources, Astronomical Models, Binary Stars, Brightness Distribution, Emission Spectra, Forbidden Bands, Heao 2, Luminosity, Radio Galaxies, X Ray Binaries

Scientific paper

The detection of an extended component of the soft X-ray source in NGC 4151 is reported. The observations and the search for the extent of the source are presented, and three possible causes are considered. These include a hot thermal plasma in pressure equilibrium with the optical line emitting clouds and confining them; shock heating of outflowing forbidden line clouds as they impact on the normal interstellar medium of the galaxy; enhanced star formation, stimulated by shock originating from outflowing emission line clouds leading to an unusual concentration of SNR and massive X-ray binaries. It is found that shock heating is the most plausible explanation, although X-ray binaries are a possible source.

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