Статья

Detection of the Mid-Infrared Unidentified Bands in the Diffuse Galactic Emission by IRTS

Takashi Onaka1Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113 E-mail (TO): [email protected]I. Yamamura2Institute of Astronomy, Faculty of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181Toshihiko Tanabé2Institute of Astronomy, Faculty of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181Thomas L. Roellig3NASA Ames Research Center, MS245-6, Moffett Field, CA-94035, USALunming Yuen3NASA Ames Research Center, MS245-6, Moffett Field, CA-94035, USA

1996en

ABI

Аннотация

This letter presents the first results of the mid-infrared spectrum (4.5–11.7 μ m) of the diffuse emission near to the galactic plane (l ∼ 50°; |b| ≤ 5° obtained by the mid-infrared spectrometer on board the Infrared Telescope in Space mission. The results clearly demonstrate the presence of unidentified infrared emission (UIR) bands at 6.2, 7.7, 8.6, and 11.3 μm in the diffuse galactic emission. The distribution of the UIR bands correlates well with the IRAS 100 μm map, suggesting that the UIR-band emitting material is well mixed with the classical dust grains in general interstellar space. The present results indicate that more than 70% of the IRAS 12 μm flux diffuse emission is emitted in the spectral range 8–11.7 μm, and that most of the 12 μm excess comes from the features associated with the UIR bands.

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Идентификаторы

DOI: 10.1093/pasj/48.5.l59

Цитирования и источники

Цитирований: 2Использованных источников: 0

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