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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709996.0, MPI für Astronomie / Publikationen_mpia
Deep near-infrared imaging of W3 Main: constraints on stellar cluster formation
Authors:Bik, A.; Stolte, A.; Gennaro, M.; Brandner, W.; Gouliermis, D.; Hußmann, B.; Tognelli, E.; Rochau, B.; Henning, T.; Adamo, A.; Beuther, H.; Pasquali, A.; Wang, Y.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Astronomy and Astrophysics
Start Page:id.A12 (15 pp)
Audience:Not Specified
Abstract / Description:Context. Embedded clusters like W3 Main are complex and dynamically evolving systems that represent an important phase in the star formation process. <BR /> Aims: We aim to characterize of the entire stellar content of W3 Main in a statistical sense, which will then identify possible differences in the evolutionary phase of the stellar populations and find clues about the formation mechanism of this massive embedded cluster. <BR /> Methods: Deep JHKs imaging is used to derive the disk fraction, Ks-band luminosity functions, and mass functions for several subregions in W3 Main. A two-dimensional completeness analysis using artificial star experiments is applied as a crucial ingredient for assessing realistic completeness limits for our photometry. <BR /> Results: We find an overall disk fraction of 7.7 ± 2.3%, radially varying from 9.4 ± 3.0% in the central 1 pc to 5.6 ± 2.2% in the outer parts of W3 Main. The mass functions derived for three subregions are consistent with a Kroupa and Chabrier mass function. The mass function of IRSN3 is complete down to 0.14 M&sun; and shows a break at M ~ 0.5 M&sun;. <BR /> Conclusions: We interpret the higher disk fraction in the center as evidence that the cluster center is younger. We find that the evolutionary sequence observed in the low-mass stellar population is consistent with the observed age spread among the massive stars. An analysis of the mass function variations does not show evidence of mass segregation. W3 Main is currently still actively forming stars, showing that the ionizing feedback of OB stars is confined to small areas (~0.5 pc). The FUV feedback might be influencing large regions of the cluster as suggested by the low overall disk fraction. Based on data acquired using the Large Binocular Telescope (LBT). The LBT is an international collaboration among institutions in Germany, Italy, and the United States. LBT Corporation partners are LBT Beteiligungsgesellschaft, Germany, representing the Max Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; Istituto Nazionale di Astrofisica, Italy; The University of Arizona on behalf of the Arizona University system; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia.JHK catalog is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> ( or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/561/A12">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/561/A12</A>
Free Keywords:stars: luminosity function; mass function; infrared: stars; open; clusters and associations: individual: W3 Main; stars: pre-main sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201321957
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