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Title:
Mid-Infrared High Spatial Resolution Observations of NGC 1569: Detection of Embedded Embryos of Star Formation
Authors:
Tokura, D.; Onaka, T.; Takahashi, H.; Miyata, T.; Sako, S.; Honda, M.; Okada, Y.; Sakon, I.; Tajiri, Y. Y.; Kataza, H.; Okamoto, Y. K.; Yamashita, T.; Fujiyoshi, T.
Affiliation:
AA(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .; Current address: Xincor miXell Co., Ltd., Shimomeguro Meguro, Tokyo 153-0064, Japan.), AB(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .), AC(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .; Current address: Gunma Astronomical Observatory, Nakayama Takayama-mura, Agatsuma, Gunma 377-0702, Japan.), AD(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AE(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AF(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8519, Japan.), AG(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8519, Japan.), AH(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .), AI(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .; Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.; Current address: Nippon System Development Co., Ltd., Nishishinjuku, Shinjuku, Tokyo 163-0077, Japan.), AJ(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8519, Japan.), AK(Institute of Astrophysics and Planetary Sciences, Faculty of Science, Ibaraki University, Bunkyo 2-1-1, Mito, Ibaraki 310-8512, Japan.), AL(Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; , .; Subaru Telescope, National Astronomical Observatory Japan, 650 North A'ohoku Place, Hilo, HI 96720-2700.; Current address: Hiroshima Astrophysical Science Center, Hiroshima University, Higashi Hiroshima, Hiroshima 739-8526, Japan.), AM(Subaru Telescope, National Astronomical Observatory Japan, 650 North A'ohoku Place, Hilo, HI 96720-2700.)
Publication:
The Astrophysical Journal, Volume 648, Issue 1, pp. 355-365. (ApJ Homepage)
Publication Date:
09/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Dwarf, Galaxies: Individual: NGC Number: NGC 1569, Galaxies: ISM, Infrared: Galaxies
DOI:
10.1086/505856
Bibliographic Code:
2006ApJ...648..355T

Abstract

We present high spatial resolution mid-infrared (MIR) imaging and spectroscopic observations of the dwarf galaxy NGC 1569 with COMICS on the Subaru telescope. The [S IV] 10.5 μm image clearly shows four pointlike sources and one extended source together with the diffuse emission. The brightest MIR source (MIR1) coincides with the intense H II region, which does not have a corresponding optical source and should thus be a source embedded in dust clouds. The infrared luminosity suggests that there are about 40 O7 stars associated with MIR1. The second brightest source located ~1.5" south of MIR1 (MIR2) is detected for the first time. This source is not seen in the radio continuum. These characteristics can be accounted for if ionizing regions in the source are compact and optically thick in the radio. The large infrared luminosity (~2×108 Lsolar) suggests that there are about 950 O7 stars in MIR2 and significant contributions from sources other than O-type stars, such as less massive stars and/or pre-main-sequence stars. If this interpretation is correct, MIR2 could be in a very early phase of massive star formation. The unidentified infrared (UIR) band at 11.2 μm is also detected in the spectrum of MIR2. The strength of the UIR band decreases with the [S IV] emission, suggesting that the UIR band weakens and the band carriers are destroyed in strong radiation fields. Super star cluster (SSC) A is also detected in the N-band images. The mid-infrared characteristics support the difference in the ages between two components of SSC A.

Based on the data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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