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An AKARI search for intracluster dust of globular clusters

Matsunaga, Noriyuki, Mito, Hiroyuki, Nakada, Yoshikazu, Fukushi, Hinako, TanabÉ, Toshihiko, Ita, Yoshifusa, Izumiura, Hideyuki, Matsuura, Mikako ORCID:, Ueta, Toshiya and Yamamura, Issei 2008. An AKARI search for intracluster dust of globular clusters. Publications of Astronomical Society of Japan 60 (sp2) , S415–S428. 10.1093/pasj/60.sp2.S415

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We report on observations of 12 globular clusters with the Far-Infrared Surveyor (FIS) aboard the AKARI satellite. Our goal is to search for emission from cold dust within clusters. We detected diffuse emissions toward NGC6402 and 2808, but the IRAS 100μm maps show the presence of strong background radiation. They are likely to have been emitted from the Galactic cirrus. We also detected 28 point-like sources mainly in WIDE-S images (90μm). At least several of them are not associated with clusters, but background galaxies identified in external catalogs. We present the spectral energy distributions (SEDs) by combining near-and-mid infrared data obtained with the Infrared Camera (IRC), if possible. Those SEDs suggest that most of the point sources are background galaxies. For most of the other clusters, we have confirmed alack of intracluster dust. We evaluated the upper limits of the intracluster dust mass to be between 10-5 and 10-3\Modot, depending on the dust temperature. The inferred lifetime of the intracluster dust is shorter than 5Myr (Td = 70 K) or 50Myr (35K). Such ashort lifetime indicates some mechanism(s) are at work to remove the intracluster dust. We also discuss its impact on the chemical evolution of globular clusters....

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0004-6264
Date of Acceptance: 12 September 2008
Last Modified: 10 May 2024 12:45

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