the butcher-oemler effect in moderate redshift galaxy clusters where a larger fraction of blue galaxies is seen is most readily explained as the result of increased star formation in some galaxies. spectroscopically, these galaxies show a composite spectrum indicative of starburst having occurred about 1 gyr ago, and are called e+a because the spectra appear to have a stars added to an old elliptical-type spectrum. a number of e+a galaxies have been found in the coma cluster which provides the chance of characterizing the starbursts more thoroughly be measuring the bolometric output of these galaxies. these galaxies are faint enough at 10-100 microns that they must be observed with iso.
Instrument
CAM01 , PHT22
Temporal Coverage
1997-06-02T03:17:08Z/1997-07-24T01:14:36Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
