Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          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
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.