Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/29196
DC Field | Value | Language |
---|---|---|
dc.contributor.author | BRAND, JAN | en_US |
dc.contributor.author | Wouterloot, J. G. A. | en_US |
dc.contributor.author | CODELLA, CLAUDIO | en_US |
dc.contributor.author | MASSI, Fabrizio | en_US |
dc.contributor.author | GIANNETTI, ANDREA | en_US |
dc.date.accessioned | 2020-12-28T10:18:34Z | - |
dc.date.available | 2020-12-28T10:18:34Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29196 | - |
dc.description.abstract | Context. This paper relates to low-mass star formation in globules, and the interaction of newly-formed stars with their environment. We follow up on the results of our earlier observations of this globule. <BR /> Aims: Our aim is to study the gas- and dust environment of the young stellar object (YSO) in globule CB88 230, the large-scale molecular outflow triggered by the jet driven by the YSO, and their interaction. <BR /> Methods: We carried out submillimetre continuum and multi-line molecular observations with several single-dish facilities, mapping the core of the globule and the large-scale outflow associated with the YSO. <BR /> Results: Dust continuum and molecular line maps (of 12CO, C18O, CS, CH3OH) show a flattened (axes ratio 1.5-1.7), asymmetric core with a full width at half maximum (FWHM)-diameter of 0.16-0.21 pc. Line profiles of 12CO, 13CO(2-1, 3-2), and CS(2-1) show self-absorption near the YSO; the absorption dip is at a slightly ( 0.3 km/s) redder velocity than that of the quiescent gas, possibly indicating infall of cooler envelope gas. The mass of the core, determined from C18O(1-0) observations, is about 8 M☉, while the virial mass is in the range 5-8M☉, depending on the assumed density distribution. We detect a slight velocity gradient ( 0.98 km/s/pc), though rotational energy is negligible with respect to gravitational and turbulent energy of the core. A fit to the spectral energy distribution of the core gives a dust temperature Td ≈ 18 K and a gas mass of ca. 2 M☉ (assuming a gas-to-dust ratio of 100). More careful modelling of the sub-mm emission (not dominated by the relatively hot central regions) yields M ≈ 8M☉. From the molecular line observations we derive gas temperatures of 10-20 K. A Bayesian analysis of the emission of selected molecules observed towards the YSO, yields Tkin ≈ 21.4 K (68% credibility interval 14.5-35.5 K) and volume density n(H2) ≈ 4.6 × 10^5 cm^-3 (8.3 × 10^4 - 9.1 × 10^5 cm^-3). We have mapped the well-collimated large-scale outflow in 12CO(3-2). The outflow has a dynamical age of a few 10^4 yr, and contains little mass (a few 10^-2 M☉). A misalignment between the axis of this large-scale outflow and that of the hot jet close to the YSO indicates that the outflow direction may be changing with time. | en_US |
dc.language.iso | eng | en_US |
dc.title | A multi-molecular line study of the star-forming globule CB88-230 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201935731 | en_US |
dc.identifier.scopus | 2-s2.0-85090025538 | en_US |
dc.identifier.isi | 000480655500004 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2019/08/aa35731-19/aa35731-19.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 628 | en_US |
dc.relation.firstpage | A98 | en_US |
dc.relation.numberofpages | 15 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 5 | en_US |
dc.description.international | sì | 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 | 2019A&A...628A..98B | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0003-1615-9043 | - |
crisitem.author.orcid | 0000-0003-1514-3074 | - |
crisitem.author.orcid | 0000-0001-6407-8032 | - |
crisitem.author.orcid | 0000-0003-3869-6501 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
---|---|---|---|---|
Brand-AA628.pdf | pdf editoriale | 3.42 MB | Adobe PDF | View/Open |
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