ALMA Data Cubes and Continuum Maps of the Irradiated Western Wall in Carina

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dc.citation.articleNumber257
dc.citation.issueNumber6
dc.citation.journalTitleThe Astronomical Journal
dc.citation.volumeNumber164
dc.contributor.authorHartigan, Patrick
dc.contributor.authorHummel, Maxwell
dc.contributor.authorIsella, Andrea
dc.contributor.authorDownes, Turlough
dc.date.accessioned2022-12-13T19:11:12Z
dc.date.available2022-12-13T19:11:12Z
dc.date.issued2022
dc.description.abstractWe present Atacama Large Millimeter/submillimeter Array observations of the continuum and line emission of 12CO, 13CO, C18O, and [C i] for a portion of the G287.38-0.62 (Car 1-E) region in the Carina star-forming complex. The new data record how a molecular cloud responds on subarcsecond scales when subjected to a powerful radiation front, and provide insights into the overall process of star formation within regions that contain the most-massive young stars. The maps show several molecular clouds superpose upon the line of sight, including a portion of the Western Wall, a highly irradiated cloud situated near the young star cluster Trumpler 14. In agreement with theory, there is a clear progression from fluoresced H2, to [C i], to C18O with distance into the photodissociation region (PDR) front. Emission from optically thick 12CO extends across the region, while 13CO, [C i] and especially C18O are more optically thin, and concentrate into clumps and filaments closer to the PDR interface. Within the Western Wall cloud itself we identify 254 distinct core-sized clumps in our data cube of C18O. The mass distribution of these objects is similar to that of the stellar initial mass function. Aside from a large-scale velocity gradient, the clump radial velocities lack any spatial coherence size. There is no direct evidence for triggering of star formation in the Western Wall in that its C18O clumps and continuum cores appear starless, with no pillars present. However, the densest portion of the cloud lies closest to the PDR, and the C18O emission is flattened along the radiation front.
dc.identifier.citationHartigan, Patrick, Hummel, Maxwell, Isella, Andrea, et al.. "ALMA Data Cubes and Continuum Maps of the Irradiated Western Wall in Carina." <i>The Astronomical Journal,</i> 164, no. 6 (2022) IOP Publishing: https://doi.org/10.3847/1538-3881/ac9522.
dc.identifier.digitalHartigan_2022_AJ_164_257
dc.identifier.doihttps://doi.org/10.3847/1538-3881/ac9522
dc.identifier.urihttps://hdl.handle.net/1911/114085
dc.language.isoeng
dc.publisherIOP Publishing
dc.rightsOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleALMA Data Cubes and Continuum Maps of the Irradiated Western Wall in Carina
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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