Constraints on the Intracluster Dust Emission in the Coma Cluster of Galaxies - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




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Abstract: We have undertaken a search for the infrared emission from the intraclusterdust in the Coma cluster of galaxies by the Multiband Imaging Photometer forSpitzer. Our observations yield the deepest mid and far-infrared images of agalaxy cluster ever achieved. In each of the three bands, we have not detecteda signature of the central excess component in contrast to the previous reporton the detection by Infrared Space Observatory ISO. We still find that thebrightness ratio between 70 and 160 microns shows a marginal sign of thecentral excess, in qualitative agreement with the ISO result. Our analysissuggests that the excess ratio is more likely due to faint infrared sourceslying on fluctuating cirrus foreground. Our observations yield the 2 sigmaupper limits on the excess emission within 100 kpc of the cluster center as 5 x10^-3 MJy-sr, 6 x 10^-2 MJy-sr, and 7 x 10^-2 MJy-sr, at 24, 70, and 160microns, respectively. These values are in agreement with those found in othergalaxy clusters and suggest that dust is deficient near the cluster center bymore than 3 orders of magnitude compared to the interstellar medium.



Autor: T. Kitayama, Y. Ito, Y. Okada, H. Kaneda, H. Takahashi, N. Ota, T. Onaka, Y. Y. Tajiri, H. Nagata, K. Yamada

Fuente: https://arxiv.org/







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