AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 47. Between the Stars I: The ISM, Galactic and Extragalactic
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[47.24] Physical Properties of the Optical Filaments in NGC 1275

B.M. Sabra, J.C. Shields (Ohio U.), A.V. Filippenko (UC-Berkeley)

This paper will present results from a study of the cooling flow filaments around NGC 1275, the central galaxy in the Perseus cluster. Emission-line measurements were used to investigate the ionization state and heating mechanism of the nebular gas. The emission-line properties were measured from an extensive spectroscopic data set acquired at the Lick Observatory 3-meter telescope. Line ratio diagrams reveal that the filaments are described by extremely low ionization. The data were also used to probe the excitation properties and the kinematics as a function of radius at several position angles. Implications for the underlying energy source for the filaments will be discussed.

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