Constraints on forbidden Fe X emission from the Perseus cluster of galaxies

Details Constraints on forbidden Fe X emission from the Perseus cluster of galaxies Constraints on forbidden Fe X emission from the Perseus cluster of galaxies

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1443s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1443-1450. Research supported by University of California.

Astronomy and Astrophysics

Astrophysics

6

Active Galactic Nuclei, Cooling Flows (Astrophysics), Cosmic Plasma, Emission Spectra, Galactic Clusters, Seyfert Galaxies, Astronomical Spectroscopy, Brightness Distribution, Iron, Luminosity, Red Shift

Scientific paper

Results are reported of a deep search for forbidden Fe X 6374 A emission associated with NGC 1275, the central galaxy in the Perseus cluster. Emission of this coronal feature is expected from intermediate temperature gas, with a total luminosity in proportion to the true rate that mass cools out of the hot intracluster plasma. After excision of the nucleus of NGC 1275, which may exhibit coronal emission associated with Seyfert activity, the spectra show no indication of the Fe X feature to limiting surface brightnesses that represent a factor of 5-10 improvement over previous limits. The new upper bounds remain consistent with mass accretion rates inferred from X-ray observations. The present observations suggest that the Perseus cooling flow, if transonic, features a sonic radius within 2.3 arcsec of the nucleus. If the optical nebulosity in NGC 1275 is photoionized by the cooling intracluster medium, the limits found in this study preclude a close spatial association between the nebular and coronal phases.

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