تقرير
Observations of high-order multiplicity in a high-mass stellar protocluster
| العنوان: | Observations of high-order multiplicity in a high-mass stellar protocluster |
|---|---|
| المؤلفون: | Li, Shanghuo, Sanhueza, Patricio, Beuther, Henrik, Chen, Huei-Ru Vivien, Kuiper, Rolf, Olguin, Fernando A., Pudritz, Ralph E., Stephens, Ian W., Zhang, Qizhou, Nakamura, Fumitaka, Lu, Xing, Kuruwita, Rajika L., Sakai, Takeshi, Henning, Thomas, Taniguchi, Kotomi, Li, Fei |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The dominant mechanism forming multiple stellar systems in the high-mass regime (M$_\ast \gtrsim $ 8 $M_{\odot}$) remained unknown because direct imaging of multiple protostellar systems at early phases of high-mass star formation is very challenging. High-mass stars are expected to form in clustered environments containing binaries and higher-order multiplicity systems. So far only a few high-mass protobinary systems, and no definitive higher-order multiples, have been detected. Here we report the discovery of one quintuple, one quadruple, one triple and four binary protostellar systems simultaneously forming in a single high-mass protocluster, G333.23--0.06, using Atacama Large Millimeter/submillimeter Array high-resolution observations. We present a new example of a group of gravitationally bound binary and higher-order multiples during their early formation phases in a protocluster. This provides the clearest direct measurement of the initial configuration of primordial high-order multiple systems, with implications for the in situ multiplicity and its origin. We find that the binary and higher-order multiple systems, and their parent cores, show no obvious sign of disk-like kinematic structure. We conclude that the observed fragmentation into binary and higher-order multiple systems can be explained by core fragmentation, indicating its crucial role in establishing the multiplicity during high-mass star cluster formation. Comment: Published in Nature Astronomy at https://www.nature.com/articles/s41550-023-02181-9Test. 27 pages, 12 figures, 1 table |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/2401.06545Test |
| رقم الانضمام: | edsarx.2401.06545 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |