Nobeyama 45 m Local Spur CO survey. I. Giant molecular filaments and cluster formation in the Vulpecula OB association. (14th December 2021)

• Record Type: Journal Article
• Authors: Kohno, Mikito; Nishimura, Atsushi; Fujita, Shinji; Tachihara, Kengo; Onishi, Toshikazu; Tokuda, Kazuki; Fukui, Yasuo; Miyamoto, Yusuke; Ueda, Shota; Kiridoshi, Ryosuke; Tsutsumi, Daichi; Torii, Kazufumi; Minamidani, Tetsuhiro; Saigo, Kazuya; Handa, Toshihiro; Sano, Hidetoshi
• Is Part Of: Publications of the Astronomical Society of Japan. Volume 74:Number 1(2022)
• Page Start: 24
• Page End: 49
• Publication Date: 2021-12-14
• Subjects: H ii regions -- ISM: clouds -- ISM: individual objects (Vulpecula OB association, Sh 2-86, Sh 2-87, Sh 2-88, NGC 6823, G59.5+0.1, IRAS 19410+2336) -- ISM: molecules -- stars: formation; Astronomy -- Periodicals; 520.5
• DOI: 10.1093/pasj/psab107
• Languages: English
• ISSNs: 0004-6264

Abstract

Abstract: We have performed new large-scale 12 CO, 13 CO, and C 18 O J = 1–0 observations toward the Vulpecula OB association ( l ∼ 60°) as part of the Nobeyama 45 m Local Spur CO survey project. Molecular clouds are distributed over ∼100 pc, with local peaks at the Sh 2-86, Sh 2-87, and Sh 2-88 high-mass star-forming regions in the Vulpecula complex. The molecular gas is associated with the Local Spur, which corresponds to the nearest inter-arm region located between the Local Arm and the Sagittarius Arm. We discovered new giant molecular filaments (GMFs) in Sh 2-86, with a length of ∼30 pc, width of ∼5 pc, and molecular mass of $\sim\!\! 4 \times 10^4\, M_{\odot }$ . We also found that Sh 2-86 contains the three velocity components at 22, 27, and 33 km s −1 . These clouds and GMFs are likely to be physically associated with Sh 2-86 because they have high 12 CO J = 2–1 to J = 1–0 intensity ratios and coincide with the infrared dust emission. The open cluster NGC 6823 exists at the common intersection of these clouds. We argue that the multiple cloud interaction scenario, including GMFs, can explain cluster formation in the Vulpecula OB association.