CO / CI observations of N83C in the early stage of star formation in SMC with ALMA. Issue Volume 14:Issue S344(2019) (August 2018)

• Record Type: Journal Article
• Authors: Zahorecz, Sarolta; Onishi, Toshikazu; Muraoka, Kazuyuki; Homma, Aya; Harada, Ryohei; Takada, Shota; Maezawa, Hiroyuki; Tokuda, Kazuki; Saigo, Kazuya; Kawamura, Akiko; Mizuno, Norikazu; Minamidani, Tetsuhiro; Meixner, Margaret; Indebetouw, Remy; Sewilo, Marta; Fukui, Yasuo; Bolatto, Alberto
• Editors: McQuinn, Kristen B. W.; Stierwalt, Sabrina
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S344(2019)
• Page Start: 313
• Page End: 315
• Publication Date: 2018-08
• Subjects: ISM: structure, -- galaxies: dwarf, -- Magellanic Clouds; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921318007706
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: The Magellanic Clouds offer the opportunity to obtain a spatially resolved view of external galaxies at reduced metallicity with no distance ambiguity. Our ALMA observations of the active star-forming region N83C in the Small Magellanic Cloud (SMC) revealed subparsec-scale molecular structures in 12 CO and 13 CO (2-1) emission Muraoka et al . (2017 ). We found strong CO peaks associated with Young Stellar Objects(YSOs) and derived a typical gas density of ∽10 4 cm −3 and gas temperature of 40-60 K from the excitation analysis. The high gas density and temperature are presumably due to the effect of the HII region under the low-metallicity environment. We have found that the column density ratios N(CI)/N(CO) are generally high throughout the cloud compared with the Galaxy, ranging from 0.2 to 2.0. A peak of the ratio is observed toward a CO peak associated with a massive protostar.