Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30507k&link_type=abstract
Spitzer Proposal ID #30507
Physics
Scientific paper
We propose MIPS observations of the Coma cluster of galaxies (A1656), aiming at the first firm detection of intergalactic dust grains. Clusters of galaxies provide a unique environment of dust-gas interactions; the X-ray emitting plasma can heat the dust to 10-20 K via collisions, as well as destroy small grains via sputtering. Recent claim of detecting collisionally heated dust grains in Coma by ISOPHOT (Stickel et al. 2002), however, has been much debated owing to insufficient quality of the data. With MIPS, we can test their result unambiguously for the first time. In addition, multi-wavelength detections enable us to determine both the amount and the mean temperature of the grains. Combined with X-ray and optical data, they further provide powerful clues to understanding the dust-gas interaction and the ejection history of dust from galaxies. In case of no detection, we are still able to place severe constraints on its amount, which is a meaningful step forward in the long-standing argument regarding the intergalactic dust. Our observation will therefore provide a unique opportunity of probing the nature of dust grains in relation to the ambient hot gas and host galaxies.
Kaneda Hidehiro
Kitayama Tetsu
Nagata Hirohisa
Onaka Takashi
Ota Naomi
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