A. Quillen , M. Rieke , N. Caldwell , G. Rieke , & C. Engelbracht
Steward Observatory, University of Arizona
12 micron emission from 6/8 Coma cluster galaxies with narrow
emission lines or E+A features has been detected.
Excess 12 micron emission is strongly
correlated with the presence of narrow emission lines
implying the presence of some on-going star formation or AGN activity.
Galaxies without these emission lines but with strong Balmer
absorption features (E+A) were not detected at significant levels
and have 2.2
m to 12m flux ratio limits consistent with
early-type galaxies
and so truly represent quiescent post-starburst galaxies.
>From the mid and far infrared colors of the brightest galaxy in our sample
which was detected at longer wavelengths with IRAS we
can estimate the far infrared luminosity of these galaxies.
We then estimate the total infrared luminosity of the Coma
cluster to be a few times
,
a factor of a few lower than that measured in more distant
rich clusters.