Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262...33c&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 33-43.
Astronomy and Astrophysics
Astrophysics
140
Cosmic Plasma, Galactic Structure, Halos, Interstellar Gas, X Ray Sources, Abundance, Focal Plane Devices, Line Spectra, Mass Flow, Plasma Temperature, Spectrum Analysis, Stellar Mass Accretion, Temperature Distribution, X Ray Spectra, X Ray Spectroscopy
Scientific paper
Canizares et al. (1979) have reported the detection of the O VIII Lyman-alpha line from the vicinity of the giant elliptical galaxy M87 in the Virgo cluster. The detection is based on high-resolution X-ray spectroscopy studies performed with the Focal Plane Crystal Spectrometer on the Einstein Observatory. The presence of a strong O VIII line indicates the existence of some material which is cooler than the bulk of the X-ray emitting gas surrounding M87. The result is interpreted as favoring models which call for radiative accretion of the hot gas onto M87. The present investigation is concerned with further high-resolution X-ray spectroscopy of M87. Seven additional emission line blends due primarily to ionized iron have been detected. These data make it possible to derive the approximate distribution of the quantity of emitting material over more than a decade in temperature for the central part of the M87 source. The obtained results are in excellent agreement with expectations for radiative, pressure driven accretion.
Canizares Calude R.
Clark George W.
Jernigan Garret J.
Markert Thomas H.
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