CCD photometry of a cluster of galaxies at a redshift of 0.57

Details CCD photometry of a cluster of galaxies at a redshift of 0.57 CCD photometry of a cluster of galaxies at a redshift of 0.57

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..215c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 213, March 1, 1985, p. 215-241. Research supported by t

Astronomy and Astrophysics

Astronomy

24

Astronomical Photometry, Charge Coupled Devices, Galactic Clusters, Red Shift, Astronomical Spectroscopy, Frames (Data Processing), Galactic Structure, Hertzsprung-Russell Diagram, Luminosity

Scientific paper

An analysis is presented of BVRI CCD photometry obtained for a galactic cluster in the direction of the South Galactic Pole. The study was performed to assess the blue galaxy content of the cluster for comparisons with evolutionary model predictions. Heightened blueness is attributed to the presence of many young stars in the field scanned. The light viewed was about 7 Gyr old, i.e., originated in a cluster with a redshift of over 0.5. The data support a hypothesis initiated by Butcher and Oemlar (1984) that higher redshift clusters contain a higher proportion of blue stars. The cause(s) of the evolutionary similarities in faint, distant galaxies is as yet unknown and requires further spectroscopic and photometric surveys.

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