Extended X-ray emission from hot gas around the normal giant elliptical galaxy NGC 5846

Astronomy and Astrophysics – Astronomy

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Active Galactic Nuclei, Elliptical Galaxies, Intergalactic Media, X Ray Sources, Interstellar Gas, Mass To Light Ratios, Radio Jets (Astronomy)

Scientific paper

The X-ray emission from NGC 5846 is characterized, reanalyzing the observations of Biermann and Kronberg (1983). The unusually high X-ray background in the field is accounted for by subtracting a background based on observations of I 10225, obtained with approximately the same IPC calibration and observation time as part of a survey of barred spiral galaxies. The acquisition and reduction of the data are described, and the results are presented in tables, graphs, and a contour map. Assuming H0 = h(50) x 50 km/sec Mpc, it is found that the X-ray emission has radial extent 120/h(50) kpc and can be attributed to hot gas of mass about 10 to the 11th x h(50) exp -5/2 solar masses and radial density distribution proportional to r exp -3/2. It is concluded that normal elliptical galaxies like NGC 5846 can exist outside large clusters.

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