Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1502s&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #15.02; Bulletin of the American Astronomical Society, Vol. 24, p.1143
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose that turbulent mixing layers between hot intracluster gas and cold gas in cluster cooling flows may be the source of the ionizing radiation required to explain the observed optical emission. Such turbulence might be driven by the relative velocity between hot gas and cooling condensates or cool gas accreted in mergers. Intermediate temperature gas at bar T ~ 10(5.7) K produced by the turbulent mixing radiates strongly in the EUV and only weakly in X-rays. We calculate the spectrum from a mixing layer following the non-equilibrium ionization and the photoionization of the mixed gas as it cools. We find the spectrum to be significantly softer than that used by Crawford & Fabian (1992, MNRAS) even when absorption is included. Thus, the mixing layer radiation alone is unable to produce the high [N II]lambda 6584/Hα ratios observed in class I nebulae. Including the emission from the X-ray producing hot gas (T~ 10(7) K) produces the necessary hardening of the spectrum and allows the optical line ratios to be matched.
Begelman Mitchell C.
Shull Michael J.
Slavin Jonathan D.
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