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THE GAIA-ESO SURVEY: METAL-RICH BANANAS IN THE BULGE

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dc.contributor.author Williams, Angus A.
dc.contributor.author Evans, N. W.
dc.contributor.author Molloy, Matthew
dc.contributor.author Kordopatis, Georges
dc.contributor.author Smith, M. C.
dc.contributor.author Shen, J.
dc.contributor.author Gilmore, G.
dc.contributor.author Randich, S.
dc.contributor.author Bensby, T.
dc.contributor.author Francois, P.
dc.contributor.author Koposov, S.E.
dc.contributor.author Recio-Blanco, A.
dc.contributor.author Bayo, A.
dc.contributor.author Carraro, G.
dc.contributor.author Casey, A.
dc.contributor.author Costado, T.
dc.contributor.author Franciosini, E.
dc.contributor.author Hourihane, A.
dc.contributor.author de Laverny, P.
dc.contributor.author Lewis, J.
dc.contributor.author Lind, K.
dc.contributor.author Magrini, L.
dc.contributor.author Monaco, L.
dc.contributor.author Morbidelli, L.
dc.contributor.author Sacco, G. G
dc.contributor.author Worley, C.
dc.contributor.author Zaggia, S.
dc.contributor.author Mikolaitis, Š.
dc.date.accessioned 2016-07-22T16:06:07Z
dc.date.available 2016-07-22T16:06:07Z
dc.date.issued 2016-06
dc.identifier.citation The Astrophysical Journal Letters, Volume 824, Number 2 es
dc.identifier.issn 2041-8205
dc.identifier.other 10.3847/2041-8205/824/2/L29
dc.identifier.uri http://repositorio.unab.cl/xmlui/handle/ria/1140
dc.description Indexación: Web of Science es
dc.description.abstract We analyze the kinematics of similar to 2000 giant stars in the direction of the Galactic bulge, extracted from the Gaia-ESO survey in the region -10 degrees less than or similar to l less than or similar to 10 degrees and -11 degrees less than or similar to b less than or similar to -3 degrees. We find distinct kinematic trends in the metal-rich ([M/H] > 0) and metal-poor ([M/H] < 0) stars in the data. The velocity dispersion of the metal-rich stars drops steeply with latitude, compared to a flat profile in the metal-poor stars, as has been seen previously. We argue that the metal-rich stars in this region are mostly on orbits that support the boxy-peanut shape of the bulge, which naturally explains the drop in their velocity dispersion profile with latitude. The metal-rich stars also exhibit peaky features in their line of sight velocity histograms, particularly along the minor axis of the bulge. We propose that these features are due to stars on resonant orbits supporting the boxy-peanut bulge. This conjecture is strengthened through the comparison of the minor axis data with the velocity histograms of resonant orbits generated in simulations of buckled bars. The "banana" or 2: 1: 2 orbits provide strongly bimodal histograms with narrow velocity peaks that resemble the Gaia-ESO metal-rich data. es
dc.description.uri http://iopscience.iop.org/article/10.3847/2041-8205/824/2/L29/meta;jsessionid=F562F79C7E819078F53AAC2B886C44D5.c1.iopscience.cld.iop.org
dc.language.iso en es
dc.publisher IOP PUBLISHING es
dc.subject GALAXIES: GENERAL es
dc.subject Galaxies: kinematics and dynamics es
dc.subject Galaxy: bulge es
dc.subject MILKY-WAY BULGE es
dc.subject HIGH-VELOCITY PEAKS es
dc.subject SPLIT RED CLUMP es
dc.subject GALACTIC BULGE es
dc.subject KINEMATICS es
dc.subject DISK es
dc.title THE GAIA-ESO SURVEY: METAL-RICH BANANAS IN THE BULGE es
dc.type Article es


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