The optical spectra of central galaxies in southern clusters Evidence for star formation

Details The optical spectra of central galaxies in southern clusters Evidence for star formation The optical spectra of central galaxies in southern clusters Evidence for star formation

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224...75j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 1, 1987, p. 75-91. Research supported by the

Astronomy and Astrophysics

Astrophysics

179

Elliptical Galaxies, Galactic Clusters, Light (Visible Radiation), Red Shift, Star Formation, Cooling Flows (Astrophysics), Cosmic Rays, Flow Velocity, Hubble Diagram, Mass Flow

Scientific paper

A collection of 21 elliptical galaxies is observed, of which nine are at the center of clusters with cooling flows, and it is found that 12 have extended optical line emission. The spectra show line ratios indicating low ionization and are qualitatively similar to those observed in other cooling flows. A problem with the production of the large observed line luminosities is highlighted and explained by some ongoing star formation with the initial mass function of a disk galaxy. The rate of such star formation is as high as 100 solar masses/yr in the case of PKS 0745 - 191, and in all the galaxies there is quantitative agreement between the H-beta line flux and the 4000-A break measured from the blue spectra. Most of the gas (more than 90 percent) must cool from X-ray temperatures and form low-mass objects without producing any detectable optical line radiation or hot young stars.

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