Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353l...7s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 353, April 10, 1990, p. L7-L10. Research supported by the Univers
Astronomy and Astrophysics
Astrophysics
51
Early Stars, Galactic Clusters, Star Clusters, Star Formation, Stellar Mass, Cooling Flows (Astrophysics), Emission Spectra, H Ii Regions, Starburst Galaxies, Ultraviolet Spectroscopy
Scientific paper
Optical and near-UV spectroscopy of an emission-line filament in the low-velocity system of NGC 1275 has revealed the presence of a young star-forming region, as evidenced by a very blue continuum source coincident with line emission characteristic of H II regions. This is the first direct detection of star formation in gas thought to be part of a cooling flow. If this young cluster is representative of star formation in cooling-flow galaxies, the current initial mass function (IMF) for these objects is not truncated at a level that excludes the formation of massive stars. For a Salpeter IMF, the cluster contains a mass similar to the largest globular clusters associated with the Milky Way (about 5 x 10 to the 6th solar masses). A dynamical constraint on the total mass of the stellar cluster may be available through measurement of its emission-line widths. It is suggested that the A-star continuum characterizing the near-nuclear population of NGC 1275 is better explained as the signature of a fading starburst, rather than as star formation in a cooling flow.
Filippenko Alexei V.
Shields Joseph C.
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