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The Core Mass Funct...
The Core Mass Function in the Massive Protocluster G286.21+0.17 Revealed by ALMA
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- Cheng, Yu (author)
- University of Florida
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- Tan, Jonathan, 1973 (author)
- University of Florida,Chalmers tekniska högskola,Chalmers University of Technology,University of Virginia
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- Liu, Mengyao (author)
- University of Virginia,University of Florida
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- Kong, Shuo (author)
- Yale University
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- Lim, Wanggi (author)
- University of Florida
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- Andersen, Morten (author)
- Gemini Observatory South
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- Da Rio, Nicola (author)
- University of Virginia
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(creator_code:org_t)
- 2018-02-01
- 2018
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 853:2
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Abstract
Subject headings
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- We study the core mass function (CMF) of the massive protocluster G286.21+0.17 with the Atacama Large Millimeter/submillimeter Array via 1.3 mm continuum emission at a resolution of 1.″0 (2500 au). We have mapped a field of 5.′3 × 5.′3 centered on the protocluster clump. We measure the CMF in the central region, exploring various core detection algorithms, which give source numbers ranging from 60 to 125, depending on parameter selection. We estimate completeness corrections due to imperfect flux recovery and core identification via artificial core insertion experiments. For masses M 1 M o , the fiducial dendrogram-identified CMF can be fit with a power law of the form dN/dlog M ∝ M -α with α ≃ 1.24 ± 0.17, slightly shallower than, but still consistent with, the index of the Salpeter stellar initial mass function of 1.35. Clumpfind-identified CMFs are significantly shallower with α ≃ 0.64 ± 0.13. While raw CMFs show a peak near 1 M o , completeness-corrected CMFs are consistent with a single power law extending down to ∼0.5 M o , with only a tentative indication of a shallowing of the slope around ∼1 M o . We discuss the implications of these results for star and star cluster formation theories.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Matematik -- Matematisk analys (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Mathematical Analysis (hsv//eng)
Keyword
- stars: formation
- ISM: clouds
Publication and Content Type
- art (subject category)
- ref (subject category)
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