Narrow-band photometry and the evolution of galaxies. III - The intermediate-redshift sample

Details Narrow-band photometry and the evolution of galaxies. III - The intermediate-redshift sample Narrow-band photometry and the evolution of galaxies. III - The intermediate-redshift sample

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..382r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 382-391. Research supported by FFWF.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photometry, Astronomical Spectroscopy, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Red Shift, Color-Color Diagram, Narrowband, Near Ultraviolet Radiation, Stellar Spectrophotometry

Scientific paper

A near-UV and blue rest frame narrow-band filter system is used to investigate the spectrophotometric evolution of elliptical galaxies. Data are presented for mean colors of ellipticals in six distant clusters for comparison with the present-day ellipticals and models of color evolution. Good agreement is found with the UV-cold models of Guiderdoni and Rocca-Volmerangre (1987), particularly with the confirmation of a strong post-MS light contribution at z = 0.4. The fraction of starforming to nonstraforming objects (Butcher-Oemler effect) is calculated from rest frame colors. Mean values of f(B) = 18 percent + or - 3 percent at z = 0.2 and 35 percent and + or - 4 percent at z = 0.4 are found. Unlike near-blue colors, the 4000 A break colors show little evolution, although this may be due to competing metallicity effects in post-MS light.

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