Hot molecular core candidates in the Galactic center 50 km s−1 molecular cloud
| العنوان: | Hot molecular core candidates in the Galactic center 50 km s−1 molecular cloud |
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| المؤلفون: | Masato Tsuboi, Atsushi Miyazaki, Kenta Uehara, Ryosuke Miyawaki |
| المصدر: | Publications of the Astronomical Society of Japan. 73:943-969 |
| بيانات النشر: | Oxford University Press (OUP), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Core (optical fiber), Physics, 010504 meteorology & atmospheric sciences, Space and Planetary Science, Molecular cloud, 0103 physical sciences, Galactic Center, Astronomy, Astronomy and Astrophysics, 010303 astronomy & astrophysics, 01 natural sciences, 0105 earth and related environmental sciences |
| الوصف: | We present results based on ${2{^{\prime \prime}_{.}}5}$-resolution observations using the Atacama Large Millimeter/Submillmeter Array (ALMA) of the Galactic center molecular cloud G−0.02−0.07, or the 50 km s−1 molecular cloud (50 MC), in the SO (NJ = 22–11) line and 86 GHz continuum emission, the combination of which is considered to trace “hot molecular core candidates” (HMCCs) appearing in the early stage of massive-star formation. In the 86 GHz continuum image, we identified nine dust cores in the central part of the 50 MC, in which four famous compact H ii regions are located. No new ultra-compact H ii regions were found. We also identified 28 HMCCs in the 50 MC with the SO line. The overall SO distribution had no clear positional correlation with the identified H ii regions. The HMCCs in the 50 MC showed a variety of association and non-association with dust and Class I CH3OH maser emissions. The variety suggests that they are not in a single evolutionary stage or environment. Nevertheless, the masses of the identified HMCCs were found to be well approximated by a single power law of their radii, MLTE/(M⊙) = 5.44 × 105 [r/(pc)]2.17 at Tex = 50–100 K. The derived HMCC masses were larger than those of the molecular cores with the same radii in the 50 MC, and also than those of the molecular clumps in the Galactic disk. Additional observations are needed to confirm the nature of these HMCCs in the 50 MC. |
| تدمد: | 2053-051X 0004-6264 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::02cef53c4e2c077447f149fa7306fc8d https://doi.org/10.1093/pasj/psab056 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........02cef53c4e2c077447f149fa7306fc8d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 2053051X 00046264 |
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