An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. II. CO Cloud Catalog

被引:9
作者
Ohno, Takahiro [1 ]
Tokuda, Kazuki [2 ,3 ,4 ]
Konishi, Ayu [4 ]
Matsumoto, Takeru [4 ]
Sewilo, Marta [5 ,6 ,7 ]
Kondo, Hiroshi [4 ]
Sano, Hidetoshi [8 ]
Tsuge, Kisetsu [9 ,10 ]
Zahorecz, Sarolta [3 ,4 ]
Goto, Nao [4 ]
Neelamkodan, Naslim [11 ]
Wong, Tony
Fukushima, Hajime
Takekoshi, Tatsuya
Muraoka, Kazuyuki [4 ]
Kawamura, Akiko
Tachihara, Kengo [1 ]
Fukui, Yasuo [1 ]
Onishi, Toshikazu [4 ]
机构
[1] Nagoya Univ, Dept Phys, Chikusa Ku, Nagoya 4648602, Japan
[2] Kyushu Univ, Fac Sci, Dept Earth & Planetary Sci, Nishi Ku, Fukuoka 8190395, Japan
[3] Natl Inst Nat Sci, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[4] Osaka Metropolitan Univ, Grad Sch Sci, Dept Phys, 1-1 Gakuen Cho,Naka Ku, Sakai, Osaka 5998531, Japan
[5] NASA Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Greenbelt, MD 20771 USA
[6] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[7] NASA Goddard Space Flight Ctr, Ctr Res & Explorat Space Sci & Technol, Greenbelt, MD 20771 USA
[8] Gifu Univ, Fac Engn, 1-1 Yanagido, Gifu 5011193, Japan
[9] Univ Erlangen Nurnberg, Dr Karl Remeis Observ, Sternwartstr 7, D-96049 Bamberg, Germany
[10] Univ Erlangen Nurnberg, ECAP, Sternwartstr 7, D-96049 Bamberg, Germany
[11] United Arab Emirates Univ, Dept Phys, Al Ain 15551, U Arab Emirates
基金
日本学术振兴会;
关键词
GIANT MOLECULAR CLOUDS; STAR-FORMATION; GALAXY EVOLUTION; INTERSTELLAR-MEDIUM; ALMA OBSERVATIONS; HEAVY-ELEMENTS; SPITZER SURVEY; MASS; GAS; YOUNG;
D O I
10.3847/1538-4357/accadb
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The nature of molecular clouds and their statistical behavior in subsolar metallicity environments are not fully explored yet. We analyzed data from an unbiased CO (J = 2-1) survey at the spatial resolution of & SIM;2 pc in the northern region of the Small Magellanic Cloud with the Atacama Compact Array to characterize the CO cloud properties. A cloud-decomposition analysis identified 426 spatially/velocity-independent CO clouds and their substructures. Based on the cross-matching with known infrared catalogs by Spitzer and Herschel, more than 90% CO clouds show spatial correlations with point sources. We investigated the basic properties of the CO clouds and found that the radius-velocity linewidth (R-& sigma; ( v )) relation follows the Milky Way-like power-law exponent, but the intercept is & SIM;1.5 times lower than that in the Milky Way. The mass functions (dN/dM) of the CO luminosity and virial mass are characterized by an exponent of & SIM;1.7, which is consistent with previously reported values in the Large Magellanic Cloud and in the Milky Way.
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页数:14
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