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http://hdl.handle.net/20.500.12386/28360
Campo DC | Valore | Lingua |
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dc.contributor.author | CODELLA, CLAUDIO | en_US |
dc.contributor.author | Bianchi, E. | en_US |
dc.contributor.author | Tabone, B. | en_US |
dc.contributor.author | Lee, C. -F. | en_US |
dc.contributor.author | Cabrit, S. | en_US |
dc.contributor.author | Ceccarelli, C. | en_US |
dc.contributor.author | PODIO, LINDA | en_US |
dc.contributor.author | BACCIOTTI, Francesca | en_US |
dc.contributor.author | Bachiller, R. | en_US |
dc.contributor.author | Chapillon, E. | en_US |
dc.contributor.author | Gueth, F. | en_US |
dc.contributor.author | Gusdorf, A. | en_US |
dc.contributor.author | Lefloch, B. | en_US |
dc.contributor.author | Leurini, Silvia | en_US |
dc.contributor.author | Pineau des Forêts, G. | en_US |
dc.contributor.author | RYGL, Kazi Lucie Jessica | en_US |
dc.contributor.author | Tafalla, M. | en_US |
dc.date.accessioned | 2020-11-16T15:45:23Z | - |
dc.date.available | 2020-11-16T15:45:23Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28360 | - |
dc.description.abstract | Context. The unprecedented combination of high-sensitivity and high angular resolution provided by the ALMA interferometer allows us to shed light on the processes leading to the formation of the jet-disc system associated with a Sun-like mass protostar. <BR /> Aims: We investigate the physical and chemical properties of the gas associated with water and interstellar complex organic molecules around a protostar on solar system scales. <BR /> Methods: The HH 212 protostellar system, in Orion B, has been mapped, thanks to ALMA-Band 7 Cycle 1 and Cycle 4 observations of dueterated water (HDO) and acetaldehyde (CH<SUB>3</SUB>CHO) emission with an angular resolution down to 0.''15 (60 au). <BR /> Results: Many emission lines due to 14 CH<SUB>3</SUB>CHO and 1 HDO transitions at high excitation (E<SUB>u</SUB> between 163 and 335 K) have been imaged in the inner 70 au region. The local thermal equilibrium analysis of the CH<SUB>3</SUB>CHO emission leads to a temperature of 78 ± 14 K and a column density of 7.6 ± 3.2 × 10<SUP>15</SUP> cm<SUP>-2</SUP>, which, when N<SUB>H<SUB>2</SUB></SUB> of 10<SUP>24</SUP> cm<SUP>-2</SUP> is assumed, leads to an abundance of X<SUB>CH<SUB>3</SUB>CHO</SUB> ≃ 8 × 10<SUP>-9</SUP>. The large velocity gradient analysis of the HDO emission also places severe constraints on the volume density, n<SUB>H<SUB>2</SUB></SUB> ≥ 10<SUP>8</SUP> cm<SUP>-3</SUP>. The line profiles are 5-7 km s<SUP>-1</SUP> wide, and CH<SUB>3</SUB>CHO and HDO both show a ±2 km s<SUP>-1</SUP> velocity gradient over a size of 70 au (blue-shifted emission towards the north-west and red-shifted emission towards the south-east) along the disc equatorial plane, in agreement with what was found so far using other molecular tracers. <BR /> Conclusions: The kinematics of CH<SUB>3</SUB>CHO and HDO are consistent with the occurrence of a centrifugal barrier, that is, the infalling envelope-rotating disc ring, which is chemically enriched through low-velocity accretion shocks. The emission radius is 60 au, in good agreement with what was found before for another interstellar complex organic molecule such as NH<SUB>2</SUB>CHO. We support a vertical structure for the centrifugal barrier, suggesting the occurrence of two outflowing, expanding, and rotating rings above and below (of about 40-45 au) the optically thick equatorial disc plane. It is tempting to speculate that these rings could probe the basis of a wind launched from this region. | en_US |
dc.language.iso | eng | en_US |
dc.title | Water and interstellar complex organics associated with the HH 212 protostellar disc. On disc atmospheres, disc winds, and accretion shocks | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201832765 | en_US |
dc.identifier.scopus | 2-s2.0-85053495460 | en_US |
dc.identifier.isi | 000444602900005 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2018/09/aa32765-18/aa32765-18.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 617 | en_US |
dc.relation.firstpage | A10 | en_US |
dc.type.referee | REF_1 | 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 | 2018A&A...617A..10C | 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 | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Cagliari | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0003-1514-3074 | - |
crisitem.author.orcid | 0000-0003-2733-5372 | - |
crisitem.author.orcid | 0000-0001-5776-9476 | - |
crisitem.author.orcid | 0000-0003-1014-3390 | - |
crisitem.author.orcid | 0000-0003-4146-9043 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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