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ALMA-IMF

hal.structure.identifierAstrophysique
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorARMANTE, M.
hal.structure.identifierLaboratoire de physique de l'ENS - ENS Paris [LPENS]
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
hal.structure.identifierAstrophysique
dc.contributor.authorGUSDORF, A.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorLOUVET, F.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorMOTTE, F.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorPOUTEAU, Y.
hal.structure.identifierLaboratoire de physique de l'ENS - ENS Paris [LPENS]
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
hal.structure.identifierAstrophysique
dc.contributor.authorLESAFFRE, P.
hal.structure.identifierUniversidad Nacional Autónoma de México = National Autonomous University of Mexico [UNAM]
dc.contributor.authorGALVÁN-MADRID, R.
hal.structure.identifierAstrophysique
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres [LERMA]
dc.contributor.authorDELL’OVA, P.
hal.structure.identifierUniversity of Virginia
dc.contributor.authorBONFAND, M.
hal.structure.identifierUniversidad Nacional Autónoma de México = National Autonomous University of Mexico [UNAM]
dc.contributor.authorNONY, T.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorBROUILLET, N.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorCUNNINGHAM, N.
hal.structure.identifierUniversity of Florida [Gainesville] [UF]
dc.contributor.authorGINSBURG, A.
hal.structure.identifierUniversité Paris Cité [UPCité]
dc.contributor.authorMEN’SHCHIKOV, A.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorBONTEMPS, S.
hal.structure.identifierUniversidad Nacional Autónoma de México = National Autonomous University of Mexico [UNAM]
dc.contributor.authorDÍAZ-GONZÁLEZ, D.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCSENGERI, T.
hal.structure.identifierInstituto Argentino de Radioastronomia [IAR]
dc.contributor.authorFERNÁNDEZ-LÓPEZ, M.
hal.structure.identifierUniversité Paris Cité [UPCité]
dc.contributor.authorGONZÁLEZ, M.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorHERPIN, F.
hal.structure.identifierUniversidad de Concepción = University of Concepción [Chile] [UdeC]
hal.structure.identifierYunnan University
dc.contributor.authorLIU, H.-L.
hal.structure.identifierGraduate University for Advanced Studies [Hayama] [SOKENDAI]
hal.structure.identifierInstituto Argentino de Radioastronomia [IAR]
dc.contributor.authorSANHUEZA, P.
hal.structure.identifierUniversidad de Concepción = University of Concepción [Chile] [UdeC]
dc.contributor.authorSTUTZ, A.M.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorVALEILLE-MANET, M.
dc.date.issued2024
dc.identifier.issn0004-6361
dc.description.abstractEnContext. One of the central questions in astrophysics is the origin of the initial mass function (IMF). It is intrinsically linked to the processes from which it originates, and hence its connection with the core mass function (CMF) must be elucidated.Aims. We aim to measure the CMF in the evolved W33-Main star-forming protocluster to compare it with CMF recently obtained in other Galactic star-forming regions, including the ones that are part of the ALMA-IMF program.Methods. We used observations from the ALMA-IMF large programme: ~2′ × 2′ maps of emission from the continuum and selected lines at 1.3 mm and 3 mm observed by the ALMA 12m only antennas. Our angular resolution was typically 1″, that is, ~2400 au at a distance of 2.4 kpc. The lines we analysed are CO (2–1), SiO (5–4), N2H+ (1–0), H41α as well as He41α blended with C41α. We built a census of dense cores in the region, and we measured the associated CMF based on a core-dependent temperature value.Results. We confirmed the ‘evolved’ status of W33-Main by identifiying three H II regions within the field, and to a lesser extent based on the number and extension of N2H+ filaments. We produced a filtered core catalogue of 94 candidates that we refined to take into account the contamination of the continuum by free-free and line emission, obtaining 80 cores with masses that range from 0.03 to 13.2 M⊙. We fitted the resulting high-mass end of the CMF with a single power law of the form N(log(M)) ∝ Mα, obtaining α = −1.44−0.22+0.16, which is slightly steeper but consistent with the Salpeter index. We categorised our cores as prestellar and protostellar, mostly based on outflow activity and hot core nature. We found the prestellar CMF to be steeper than a Salpeter-like distribution, and the protostellar CMF to be slightly top heavy. We found a higher proportion of cores within the H II regions and their surroundings than in the rest of the field. We also found that the cores’ masses were rather low (maximum mass of ~13 M⊙).Conclusions. We find that star formation in W33-Main could be compatible with a ‘clump-fed’ scenario of star formation in an evolved cloud characterised by stellar feedback in the form of H II regions, and under the influence of massive stars outside the field. Our results differ from those found in less evolved young star-forming regions in the ALMA-IMF program. Further investigations are needed to elucidate the evolution of late CMFs towards the IMF over statistically significant samples.
dc.description.sponsorshipL'origine de la masse des étoiles dans des nuages hiérarchiques en effondrement - ANR-20-CE31-0009
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enstars: formation
dc.subject.enstars: low-mass
dc.subject.enstars: massive
dc.subject.enstars: protostars
dc.subject.enISM: clouds
dc.subject.ensubmillimeter: ISM
dc.title.enALMA-IMF
dc.title.enX. The core population in the evolved W33-Main (G012.80) protocluster
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/202347595
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.description.sponsorshipEuropeOpticon RadioNet Pilot
dc.description.sponsorshipEuropeUnderstanding our Galactic ecosystem: From the disk of the Milky Way to the formation sites of stars and planets
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA122
bordeaux.volume686
bordeaux.peerReviewedoui
hal.identifierhal-04601410
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04601410v1
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