Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/23381
DC Field | Value | Language |
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dc.contributor.author | MASSI, Fabrizio | en_US |
dc.contributor.author | GIANNETTI, ANDREA | en_US |
dc.contributor.author | DI CARLO, Elisa | en_US |
dc.contributor.author | BRAND, JAN | en_US |
dc.contributor.author | BELTRAN SOROLLA, MARIA TERESA | en_US |
dc.contributor.author | Marconi, G. | en_US |
dc.date.accessioned | 2020-03-19T09:13:57Z | - |
dc.date.available | 2020-03-19T09:13:57Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/23381 | - |
dc.description | This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. It is also partially based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program # 9091 (P.I. Jeff Hester). This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. The Digitized Sky Survey (DSS) was produced at the Space Telescope Science Institute under US Government grant NAG W–2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions. F.M. and E.D.C. acknowledge partial funding by the PRIN INAF 2009 grant CRA 1.06.12.10 (“Formation and early evolution of massive star clusters”, P.I. R. Gratton). EDC is also grateful for financial support from PRIN INAF 2011 (“Multiple Populations in Globular Clusters: their role in the Galaxy assembly”, P.I.: E. Carretta). | - |
dc.description.abstract | Context. NGC 6357 is an active star forming region with very young massive open clusters. These clusters contain some of the most massive stars in the Galaxy and strongly interact with nearby giant molecular clouds. <BR /> Aims: We study the young stellar populations of the region and of the open cluster Pismis 24, focusing on their relationship with the nearby giant molecular clouds. We seek evidence of triggered star formation "propagating" from the clusters. <BR /> Methods: We used new deep JHK<SUB>s</SUB> photometry, along with unpublished deep Spitzer/IRAC mid-infrared photometry, complemented with optical HST/WFPC2 high spatial resolution photometry and X-ray Chandra observations, to constrain age, initial mass function, and star formation modes in progress. We carefully examine and discuss all sources of bias (saturation, confusion, different sensitivities, extinction). <BR /> Results: NGC 6357 hosts three large young stellar clusters, of which Pismis 24 is the most prominent. We found that Pismis 24 is a very young (~1-3 Myr) open cluster with a Salpeter-like initial mass function and a few thousand members. A comparison between optical and infrared photometry indicates that the fraction of members with a near-infrared excess (i.e., with a circumstellar disk) is in the range 0.3-0.6, consistent with its photometrically derived age. We also find that Pismis 24 is likely subdivided into a few different subclusters, one of which contains almost all the massive members. There are indications of current star formation triggered by these massive stars, but clear age trends could not be derived (although the fraction of stars with a near-infrared excess does increase towards the Hii region associated with the cluster). The gas out of which Pismis 24 formed must have been distributed in dense clumps within a cloud of less dense gas ~1 pc in radius. <BR /> Conclusions: Our findings provide some new insight into how young stellar populations and massive stars emerge, and evolve in the first few Myr after birth, from a giant molecular cloud complex. <P />Based on observations made with ESO telescopes at the La Silla Paranal Observatory under programme ID 63.L-0717.Tables 1 and 2 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/573/A95">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/573/A95</A>Appendices are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201424388/olm">http://www.aanda.org</A> | en_US |
dc.language.iso | eng | en_US |
dc.title | Young open clusters in the Galactic star forming region NGC 6357 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201424388 | en_US |
dc.identifier.scopus | 2-s2.0-84919779790 | en_US |
dc.identifier.isi | 000346901300044 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2015/01/aa24388-14/aa24388-14.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 573 | en_US |
dc.relation.firstpage | A95 | en_US |
dc.relation.numberofpages | 33 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 6 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | CHL | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015A&A...573A..95M | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegherò il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | O.A. Abruzzo | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0001-6407-8032 | - |
crisitem.author.orcid | 0000-0003-3869-6501 | - |
crisitem.author.orcid | 0000-0002-6051-0964 | - |
crisitem.author.orcid | 0000-0003-1615-9043 | - |
crisitem.author.orcid | 0000-0003-3315-5626 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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aa24388-14.pdf | 5.41 MB | Adobe PDF | View/Open |
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