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CO observations of the molecular gas in the Galactic H II region Sh2-48: Evidence for cloud-cloud collision as a trigger of high-mass star formation
Kuno, Nario; Tachihara, Kengo; Fukui, Yasuo +15 more
Sh2-48 is a Galactic H II region, 3.8 kpc distant, with an O9.5-type star identified at its center. As a part of the FOREST Unbiased Galactic plane Imaging survey using the Nobeyama 45 m telescope (FUGIN) project, we obtained a CO J = 1-0 data set for a large area of Sh2-48 at a spatial resolution of 21″ (∼0.4 pc), and used it to find a molecular …
CO observations toward the isolated mid-infrared bubble S44: External triggering of O-star formation by a cloud-cloud collision
Tachihara, Kengo; Fukui, Yasuo; Sano, Hidetoshi +11 more
We have performed a multi-wavelength study of the mid-infrared bubble S44 to investigate the origin of isolated high-mass star(s) and the star-formation process around the bubble formed by the H II region. We report on the results of new CO observations (12CO, 13CO J = 1-0, and 12CO J = 3-2) toward the isolated bub…
The nature of bright C-complex asteroids
Hasegawa, Sunao; Usui, Fumihiko; Kuroda, Daisuke +1 more
Most C-complex asteroids have albedo values less than 0.1, but there are some high-albedo (bright) C-complex asteroids with albedo values exceeding 0.1. To reveal the nature and origin of bright C-complex asteroids, we conducted spectroscopic observations of the asteroids at visible and near-infrared wavelengths. As a result, the bright B-, C-, an…
Dust dissipation timescales in the intermediate and outer regions of protoplanetary disks
Nakagawa, Takao; Kwon, Jungmi; Takita, Satoshi +2 more
Dust and gas in protoplanetary disks dissipate as central stars evolve. In order to estimate the dust dissipation timescales in the protoplanetary disks, we stacked the WISE 12 and 22, and the AKARI 90 µm survey images of known T Tauri stars and derived the average fluxes, well below the survey flux limit in the 90 µm band. We classifi…