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KFPA Examinations of Young STellar Object Natal Environments (KEYSTONE): Hierarchical Ammonia Structures in Galactic Giant Molecular Clouds

dc.contributor.authorKEOWN, Jared
dc.contributor.authorDI FRANCESCO, James
dc.contributor.authorROSOLOWSKY, Erik
dc.contributor.authorSINGH, Ayushi
dc.contributor.authorFIGURA, Charles
dc.contributor.authorKIRK, Helen
hal.structure.identifierLaboratoire d'Astrophysique de Marseille [LAM]
dc.contributor.authorANDERSON, L. D.
dc.contributor.authorCHEN, Michael Chun-Yuan
dc.contributor.authorELIA, Davide
dc.contributor.authorFRIESEN, Rachel
dc.contributor.authorGINSBURG, Adam
dc.contributor.authorMARSTON, A.
dc.contributor.authorPEZZUTO, Stefano
dc.contributor.authorSCHISANO, Eugenio
hal.structure.identifierFORMATION STELLAIRE 2019
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorCASELLI, Paola
dc.contributor.authorLIU, Hong-Li
dc.contributor.authorLONGMORE, Steven
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorMOTTE, Frederique
dc.contributor.authorMYERS, Philip C.
dc.contributor.authorOFFNER, Stella S. R.
dc.contributor.authorSANHUEZA, Patricio
hal.structure.identifierI. Physikalisches Institut [Köln]
dc.contributor.authorSCHNEIDER, Nicola
dc.contributor.authorSTEPHENS, Ian
dc.contributor.authorURQUHART, James
dc.date.issued2019
dc.identifier.issn0004-637X
dc.description.abstractEnWe present initial results from the K-band focal plane array Examinations of Young STellar Object Natal Environments (KEYSTONE) survey, a large project on the 100-m Green Bank Telescope mapping ammonia emission across eleven giant molecular clouds at distances of $0.9-3.0$ kpc (Cygnus X North, Cygnus X South, M16, M17, MonR1, MonR2, NGC2264, NGC7538, Rosette, W3, and W48). This data release includes the NH$_3$ (1,1) and (2,2) maps for each cloud, which are modeled to produce maps of kinetic temperature, centroid velocity, velocity dispersion, and ammonia column density. Median cloud kinetic temperatures range from $11.4\pm2.2$ K in the coldest cloud (MonR1) to $23.0\pm6.5$ K in the warmest cloud (M17). Using dendrograms on the NH$_3$ (1,1) integrated intensity maps, we identify 856 dense gas clumps across the eleven clouds. Depending on the cloud observed, $40-100\%$ of the clumps are aligned spatially with filaments identified in H$_2$ column density maps derived from SED-fitting of dust continuum emission. A virial analysis reveals that 523 of the 835 clumps ($\sim63\%$) with mass estimates are bound by gravity alone. We find no significant difference between the virial parameter distributions for clumps aligned with the dust-continuum filaments and those unaligned with filaments. In some clouds, however, hubs or ridges of dense gas with unusually high mass and low virial parameters are located within a single filament or at the intersection of multiple filaments. These hubs and ridges tend to host water maser emission, multiple 70$\mu$m-detected protostars, and have masses and radii above an empirical threshold for forming massive stars.
dc.description.sponsorshipGENeration et Evolution des Structures du milieu InterStellaire
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.title.enKFPA Examinations of Young STellar Object Natal Environments (KEYSTONE): Hierarchical Ammonia Structures in Galactic Giant Molecular Clouds
dc.typeArticle de revue
dc.identifier.doi10.3847/1538-4357/ab3e76
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1908.10514
bordeaux.journalThe Astrophysical Journal
bordeaux.pageid. 4
bordeaux.volume884
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-02282427
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02282427v1
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