Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/24339
Campo DC | Valore | Lingua |
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dc.contributor.author | Koposov, Sergey E. | en_US |
dc.contributor.author | Casey, Andrew R. | en_US |
dc.contributor.author | Belokurov, Vasily | en_US |
dc.contributor.author | Lewis, James R. | en_US |
dc.contributor.author | Gilmore, Gerard | en_US |
dc.contributor.author | Worley, Clare | en_US |
dc.contributor.author | Hourihane, Anna | en_US |
dc.contributor.author | RANDICH, Maria Sofia | en_US |
dc.contributor.author | Bensby, T. | en_US |
dc.contributor.author | BRAGAGLIA, Angela | en_US |
dc.contributor.author | Bergemann, M. | en_US |
dc.contributor.author | Carraro, G. | en_US |
dc.contributor.author | Costado, M. T. | en_US |
dc.contributor.author | FLACCOMIO, Ettore | en_US |
dc.contributor.author | Francois, P. | en_US |
dc.contributor.author | Heiter, U. | en_US |
dc.contributor.author | Hill, V. | en_US |
dc.contributor.author | Jofre, P. | en_US |
dc.contributor.author | Lando, C. | en_US |
dc.contributor.author | Lanzafame, Alessandro Carmelo | en_US |
dc.contributor.author | de Laverny, P. | en_US |
dc.contributor.author | Monaco, L. | en_US |
dc.contributor.author | MORBIDELLI, LORENZO | en_US |
dc.contributor.author | Sbordone, L. | en_US |
dc.contributor.author | Mikolaitis, Š. | en_US |
dc.contributor.author | Ryde, N. | en_US |
dc.date.accessioned | 2020-04-29T15:58:22Z | - |
dc.date.available | 2020-04-29T15:58:22Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24339 | - |
dc.description | Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 188.B-3002. These data products have been processed by the Cambridge Astronomy Survey Unit (CASU) at the Institute of Astronomy, University of Cambridge, and by the FLAMES/UVES reduction team at INAF/Osservatorio Astrofisico di Arcetri. These data have been obtained from the Gaia -ESO Survey Data Archive, prepared and hosted by the Wide Field Astronomy Unit, Institute for Astronomy, University of Edinburgh, which is funded by the UK Science and Technology Facilities Council. This work was partly supported by the European Union FP7 programme through ERC grant numbers 320360 and 308024 and by the Leverhulme Trust through grant RPG-2012-541. We acknowledge the support from INAF and Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) in the form of the grant “Premiale VLT 2012.” The results presented here benefit from discussions held during the Gaia -ESO workshops and conferences supported by the ESF (European Science Foundation) through the GREAT Research Network Programme. Support for L. S. is provided by Chile’s Ministry of Economy, Development, and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. We thank Matt Walker, Mario Mateo, Gurtina Besla, David Nidever, Bertrand Plez, Matthew Ruffoni, and Juliet Pickering. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013 ). | - |
dc.description.abstract | We report on VLT/GIRAFFE spectra of stars in two recently discovered ultra-faint satellites, Reticulum 2 and Horologium 1, obtained as part of the Gaia-ESO Survey. We identify 18 members in Reticulum 2 and five in Horologium 1. We find Reticulum 2 to have a velocity dispersion of {3.22}<SUB>-0.49</SUB><SUP>+1.64</SUP> {km} {{{s}}}<SUP>-1</SUP>, implying a mass-to-light ratio (M/L) of ̃500. The mean metallicity of Reticulum 2 is [{Fe}/{{H}}]=-2.46, with an intrinsic dispersion of ̃0.3 dex and α-enhancement of ̃0.4 dex. We conclude that Reticulum 2 is a dwarf galaxy. We also report on the serendipitous discovery of four stars in a previously unknown stellar substructure near Reticulum 2 with [{Fe}/{{H}}]̃ -2 and {V}<SUB>{hel</SUB>}̃ 220 {km} {{{s}}}<SUP>-1</SUP>, far from the systemic velocity of Reticulum 2. For Horologium 1 we infer a velocity dispersion of σ ≤ft(V\right)={4.9}<SUB>-0.9</SUB><SUP>+2.8</SUP> {km} {{{s}}}<SUP>-1</SUP> and a M/L ratio of ̃600, leading us to conclude that Horologium 1 is also a dwarf galaxy. Horologium 1 is slightly more metal-poor than Reticulum 2 ([{Fe}/{{H}}]=-2.76) and is similarly α-enhanced: [α /{Fe}]̃ 0.3 {dex} with a significant spread of metallicities of 0.17 dex. The line-of-sight velocity of Reticulum 2 is offset by 100 km s<SUP>-1</SUP> from the prediction of the orbital velocity of the Large Magellanic Cloud (LMC), thus making its association with the Cloud uncertain. However, at the location of Horologium 1, both the backward-integrated orbit of the LMC and its halo are predicted to have radial velocities similar to that of the dwarf. Therefore, it is possible that Horologium 1 is or once was a member of the Magellanic family. | en_US |
dc.language.iso | eng | en_US |
dc.title | Kinematics and Chemistry of Recently Discovered Reticulum 2 and Horologium 1 Dwarf Galaxies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1088/0004-637X/811/1/62 | en_US |
dc.identifier.scopus | 2-s2.0-84945578370 | en_US |
dc.identifier.isi | 000363471600063 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.1088/0004-637X/811/1/62 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 811 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 62 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015ApJ...811...62K | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegherò il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Catania | - |
crisitem.author.orcid | 0000-0003-2438-0899 | - |
crisitem.author.orcid | 0000-0002-0338-7883 | - |
crisitem.author.orcid | 0000-0002-3638-5788 | - |
crisitem.author.orcid | 0000-0002-2697-3607 | - |
crisitem.author.orcid | 0000-0003-0304-9910 | - |
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