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Paper: AKARI Far-Infrared Spectroscopic Observations of the Galactic Center Region
Volume: 418, AKARI, a Light to Illuminate the Misty Universe
Page: 423
Authors: Yasuda, A.; Kaneda, H.; Nakagawa, T.; Okada, Y.; Kawada, M.; Murakami, N.; Takahashi, H.; Ootsubo, T.
Abstract: We have observed the Quintuplet- and Arches-cluster regions with the Fourier Transform Spectrometer (FTS) of the Far-Infrared Surveyor (FIS) onboard AKARI to investigate the physical conditions of the interstellar matter around the clusters. The FIS-FTS mapping data reveal differences in spatial distribution among the far-infrared [O III], [N II], and [C II] line emissions near the Arches-cluster; the emission of an ionic line with a higher ionization potential is distributed closer to the Arches-cluster. This clearly indicates that UV photons from the Arches-cluster are ionizing the surface of nearby molecular clouds and penetrating deeper to dissociate the cloud. We have estimated the effective temperature of the Arches-cluster to be about 34000 K from the ratio of [O III]/[N II] lines. We have also estimated the dust color temperature to be about 30 K from the continuum ratio of 88/122 μm.
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