Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61
We present 1.05 mm Atacama Large Millimeter/submillimeter Array (ALMA) observations of the deeply embedded high-mass protocluster G11.92−0.61, designed to search for low-mass cores within the accretion reservoir of the massive protostars. Our ALMA mosaic, which covers an extent of ∼0.7 pc at sub-arc...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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08 February 2017
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2017, Jahrgang: 468, Heft: 3, Pages: 3694-3708 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stx043 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stx043
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| Verfasserangaben: | C.J. Cyganowski, C.L. Brogan, T.R. Hunter, R. Smith, J.M.D. Kruijssen, I.A. Bonnell and Q. Zhang |
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| 100 | 1 | |a Cyganowski, Claudia J. |e VerfasserIn |4 aut | |
| 245 | 1 | 0 | |a Simultaneous low- and high-mass star formation in a massive protocluster |b ALMA observations of G11.92-0.61 |c C.J. Cyganowski, C.L. Brogan, T.R. Hunter, R. Smith, J.M.D. Kruijssen, I.A. Bonnell and Q. Zhang |
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| 520 | |a We present 1.05 mm Atacama Large Millimeter/submillimeter Array (ALMA) observations of the deeply embedded high-mass protocluster G11.92−0.61, designed to search for low-mass cores within the accretion reservoir of the massive protostars. Our ALMA mosaic, which covers an extent of ∼0.7 pc at sub-arcsecond (∼1400 au) resolution, reveals a rich population of 16 new millimetre continuum sources surrounding the three previously known millimetre cores. Most of the new sources are located in the outer reaches of the accretion reservoir: the median projected separation from the central, massive (proto)star MM1 is ∼0.17 pc. The derived physical properties of the new millimetre continuum sources are consistent with those of low-mass prestellar and protostellar cores in nearby star-forming regions: the median mass, radius and density of the new sources are 1.3 M⊙, 1600 au and n$$_{\rm H_2}\sim 10^{7}$$ cm−3. At least three of the low-mass cores in G11.92−0.61 drive molecular outflows, traced by high-velocity 12CO(3-2) (observed with the Submillimeter Array) and/or by H2CO and CH3OH emission (observed with ALMA). This finding, combined with the known outflow/accretion activity of MM1, indicates that high- and low-mass stars are forming (accreting) simultaneously within this protocluster. Our ALMA results are consistent with the predictions of competitive-accretion-type models in which high-mass stars form along with their surrounding clusters. | ||
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