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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742780.0, MPI für Astronomie / Publikationen_mpia
Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61
Authors:Cyganowski, C. J.; Brogan, C. L.; Hunter, T. R.; Smith, R.; Kruijssen, J. M. D.; Bonnell, I. A.; Zhang, Q.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:3
Start Page:3694
End Page:3708
Audience:Not Specified
Abstract / Description: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_H_2˜ 107 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.
Free Keywords:stars: formation; stars: protostars; ISM: individual objects: G11.92-0.61; ISM: molecules; submillimetre: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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