Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30125
DC Field | Value | Language |
---|---|---|
dc.contributor.author | SANNA, ALBERTO | en_US |
dc.contributor.author | MOSCADELLI, Luca | en_US |
dc.contributor.author | Surcis, Gabriele | en_US |
dc.contributor.author | van Langevelde, H. J. | en_US |
dc.contributor.author | Torstensson, K. J. E. | en_US |
dc.contributor.author | Sobolev, A. M. | en_US |
dc.date.accessioned | 2021-02-01T14:24:04Z | - |
dc.date.available | 2021-02-01T14:24:04Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30125 | - |
dc.description.abstract | Aims: In order to test the nature of an (accretion) disk in the vicinity of Cepheus A HW2, we measured the three-dimensional velocity field of the CH<SUB>3</SUB>OH maser spots, which are projected within 1000 au of the HW2 object, with an accuracy on the order of 0.1 km s<SUP>-1</SUP>. <BR /> Methods: We made use of the European VLBI Network (EVN) to image the 6.7 GHz CH<SUB>3</SUB>OH maser emission toward Cepheus A HW2 with 4.5 milliarcsec resolution (3 au). We observed at three epochs spaced by one year between 2013 and 2015. During the last epoch, in mid-March 2015, we benefited from the newly deployed Sardinia Radio Telescope. <BR /> Results: We show that the CH<SUB>3</SUB>OH velocity vectors lie on a preferential plane for the gas motion with only small deviations of 12° ± 9° away from the plane. This plane is oriented at a position angle of 134° east of north, and inclined by 26° with the line of sight, closely matching the orientation of the previously reported disk-like structure. Knowing the orientation of the equatorial plane, we can reconstruct a face-on view of the CH<SUB>3</SUB>OH gas kinematics onto the plane. CH<SUB>3</SUB>OH maser emission is detected within a radius of 900 au from HW2, and down to a radius of about 300 au, the latter coincident with the extent of the dust emission at 0.9 mm. The velocity field is dominated by an infall component of about 2 km s<SUP>-1</SUP> down to a radius of 300 au, where a rotational component of 4 km s<SUP>-1</SUP> becomes dominant. We discuss the nature of this velocity field and the implications for the enclosed mass. <BR /> Conclusions: These findings directly support the interpretation that the high-density gas and dust emission that surrounds Cepheus A HW2 traces an accretion disk. | en_US |
dc.language.iso | eng | en_US |
dc.title | Planar infall of CH3OH gas around Cepheus A HW2 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201730773 | en_US |
dc.identifier.scopus | 2-s2.0-85024391889 | en_US |
dc.identifier.isi | 000406619100138 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2017/07/aa30773-17/aa30773-17.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 603 | en_US |
dc.relation.firstpage | 1 | en_US |
dc.relation.lastpage | 9 | en_US |
dc.relation.numberofpages | 9 | en_US |
dc.relation.article | A94 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 6 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | DEU | en_US |
dc.contributor.country | CHL | en_US |
dc.contributor.country | NLD | en_US |
dc.contributor.country | RUS | 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 | 2017A&A...603A..94S | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | 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. Cagliari | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Cagliari | - |
crisitem.author.orcid | 0000-0001-7960-4912 | - |
crisitem.author.orcid | 0000-0002-8517-8881 | - |
crisitem.author.orcid | 0000-0003-2775-442X | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
1704.03760.pdf | postprint | 448.62 kB | Adobe PDF | View/Open |
aa30773-17.pdf | Pdf editoriale | 428.78 kB | Adobe PDF | View/Open |
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