Spectra of galaxies in clusters. I - The Butcher-Oemler effect

Details Spectra of galaxies in clusters. I - The Butcher-Oemler effect Spectra of galaxies in clusters. I - The Butcher-Oemler effect

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..629n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 629-643. Research supported by the University of Mic

Astronomy and Astrophysics

Astrophysics

35

Astronomical Photometry, Galactic Clusters, Red Shift, Spiral Galaxies, Stellar Spectra, Morphology, Stellar Color

Scientific paper

The authors have obtained spectra for 62 galaxies in seven dense Butcher-Oemler (BO) clusters with redshifts 0.2 ≤ z ≤ 0.38. The authors combined them with data from the literature and examined the Butcher-Oemler effect. The "color" of a galaxy measured by BO's photometry in redshifted bandpasses is generally consistent with the observed galaxy spectrum when compared with low-redshift red (E - S0) and blue (spiral) galaxies. The authors calculate dfb/dz = 0.60±0.06 for the slope of the Butcher-Oemler effect. This is consistent with BO's photometric estimate of 0.52. The correlation between blue galaxy fraction and cluster velocity dispersion is strong but cannot be interpreted unambiguously in terms of stripping or starburst activity which might result from the dense cluster environment.

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