Structure of the X-ray source in the Virgo cluster of galaxies

Details Structure of the X-ray source in the Virgo cluster of galaxies Structure of the X-ray source in the Virgo cluster of galaxies

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..95g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Sept. 15, 1977, p. L95-L99.

Astronomy and Astrophysics

Astronomy

57

Astronomical Models, Galactic Clusters, Galactic Structure, X Ray Sources, Angular Resolution, Brightness, Emission Spectra, Point Sources, Radiant Flux Density, Spaceborne Astronomy

Scientific paper

High-angular-resolution observations in the 0.15-1.5-keV band with an imaging X-ray telescope shows the extended X-ray source in the Virgo cluster of galaxies to be a diffuse halo of about 15 arcmin core radius surrounding M87. The angular structure of the surface brightness is marginally consistent with either of two simple models: (1) an isothermal (or adiabatic or hydrostatic) sphere plus a point source at M87 accounting for 12% of the total 0.5-1.5-keV intensity or (2) a power-law function without a discrete point source. No evidence for a point source is seen in the 0.15-0.28-keV band, which is consistent with self-absorption by about 10 to the 21st power per sq cm of matter having a cosmic abundance. The power-law models are motivated by the idea that radiation losses regulate the accretion of matter onto M87 and can account for the observed difference in the size of the X-ray source as seen in the present measurements and at higher energies.

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