Einstein Observatory solid state spectrometer observations of M87 and the Virgo cluster

Details Einstein Observatory solid state spectrometer observations of M87 and the Virgo cluster Einstein Observatory solid state spectrometer observations of M87 and the Virgo cluster

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8234314l&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Emission Spectra, Thermal Emission, Virgo Galactic Cluster, X Ray Sources, Abundance, Cooling Flows (Astrophysics), Heao 1, Interstellar Gas, Solid State Devices, Temperature Gradients, X Ray Spectroscopy

Scientific paper

X-ray observations of the galaxy M87 and of a region in the Virgo cluster displaced 7 minutes from the center of M87 are presented. X-ray spectra are obtained at these two locations with the slid state spectrometer onboard the Einstein Observatory. Emission lines were observed in both locations, indicating the presence of heavy elements at abundances approximately solar (to within a factor of 2). A temperature gradient, T increases from approximately 1.4 keV at the position of M87 to T approximately 3.35 keV 7' away, was detected. There is lower temperature thermal emission at the center of M87 with T approximately 0.6 keV, consistent with models for cooling flows in this cluster. In addition to the thermal emission, a power law component in the spectrum of M87, was detected consistent with that observed by HEAO-1, indicating that this component probably originates in the galaxy itself. The presence of intracluster gas having density approximately .001 cu cm and temperature approximately 30 million K is indicated.

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