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The Gaia-ESO Survey :
The Gaia-ESO Survey : Exploring the complex nature and origins of the Galactic bulge populations
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- Rojas-Arriagada, A. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.;Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile.;Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile.,Côte d'Azur Observatory,Millennium Institute for Astrophysics,Pontifical Catholic University of Chile,University of Cambridge
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- Recio-Blanco, A. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.,Côte d'Azur Observatory
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- de laverny, P. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.,Côte d'Azur Observatory
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visa fler...
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- Mikolaitis, S. (författare)
- Vilnius Univ, Inst Theoret Phys & Astron, A Gostauto 12, LT-01108 Vilnius, Lithuania.,Vilnius University,Côte d'Azur Observatory
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- Matteucci, F. (författare)
- Univ Trieste, Dipartimento Fis, Sez Astron, Via GB Tiepolo 11, I-34143 Trieste, Italy.;INAF, Osserv Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy.;Ist Nazl Fis Nucl, Sez Trieste, Via A Valerio 2, I-34127 Trieste, Italy.,University of Trieste,INAF Astronomical Observatory of Trieste,INFN Section of Trieste
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- Spitoni, E. (författare)
- Univ Trieste, Dipartimento Fis, Sez Astron, Via GB Tiepolo 11, I-34143 Trieste, Italy.;INAF, Osserv Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy.,University of Trieste,INAF Astronomical Observatory of Trieste,University of Cambridge
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- Schultheis, M. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.
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- Hayden, M. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.,Côte d'Azur Observatory
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- Hill, V. (författare)
- Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France.,Côte d'Azur Observatory
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- Zoccali, M. (författare)
- Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile.;Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile.,Millennium Institute for Astrophysics,Pontifical Catholic University of Chile
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- Minniti, D. (författare)
- Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile.;Univ Andres Bello, Dept Ciencias Fis, 220 Republ, Santiago, Chile.;Vatican Observ, I-00120 Vatican City, Vatican.,Millennium Institute for Astrophysics,Andrés Bello National University,Vatican Observatory
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- Gonzalez, O. A. (författare)
- European Southern Observ, Alonso Cordova 3107 Vitacura, Santiago, Chile.;Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.,European Southern Observatory Santiago,University of Edinburgh
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- Gilmore, G. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge,European Southern Observatory Santiago,INAF - Osservatorio Astrofisico di Arcetri
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- Randich, S. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
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- Feltzing, S. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Alfaro, E. J. (författare)
- Inst Astrofis Andalucia, CSIC, Apdo 3004, Granada 18080, Spain.,CSIC Instituto de Astrofísica de Andalucía (IAA)
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- Babusiaux, C. (författare)
- Univ Paris Diderot, CNRS, GEPI, Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France.,Paris Diderot University
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- Bensby, T. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Bragaglia, A. (författare)
- INAF, Osserv Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy.,INAF Osservatorio Astronomico di Bologna
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- Flaccomio, E. (författare)
- INAF, Osserv Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy.,INAF Palermo Astronomical Observatory
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- Koposov, S. E. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
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- Pancino, E. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.;ASI Sci Data Ctr, Via Politec SNC, I-00133 Rome, Italy.,Italian Space Agency,INAF - Osservatorio Astrofisico di Arcetri
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- Bayo, A. (författare)
- Univ Valparaiso, Inst Fis & Astron, Valparaiso, Chile.,University of Valparaíso
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- Carraro, G. (författare)
- European Southern Observ, Alonso Cordova 3107 Vitacura, Santiago, Chile.
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- Casey, A. R. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
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- Costado, M. T. (författare)
- Inst Astrofis Andalucia, CSIC, Apdo 3004, Granada 18080, Spain.,CSIC Instituto de Astrofísica de Andalucía (IAA)
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- Damiani, F. (författare)
- INAF, Osserv Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy.,INAF Palermo Astronomical Observatory
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- Donati, P. (författare)
- INAF, Osserv Astron Bologna, Via Ranzani 1, I-40127 Bologna, Italy.,INAF Osservatorio Astronomico di Bologna
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- Franciosini, E. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
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- Hourihane, A. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge
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- Jofre, P. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.;Univ Diego Portales, Fac Ingn, Nucl Astron, Av Ejercito 441, Santiago, Chile.,Diego Portales University,University of Cambridge
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- Lardo, C. (författare)
- Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England.,Liverpool John Moores University
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- Lewis, J. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge
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- Lind, K. (författare)
- Uppsala University,Uppsala universitet,Institutionen för fysik och astronomi,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.,Max Planck Institute for Astronomy
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- Magrini, L. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
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- Morbidelli, L. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
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- Sacco, G. G. (författare)
- INAF, Osserv Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
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- Worley, C. C. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge
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- Zaggia, S. (författare)
- Univ Padua, INAF, Vicolo Osserv 5, I-35122 Padua, Italy.,INAF - Osservatorio Astronomico di Padova
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Univ Cote Azur, Lab Lagrange, Observ Cote Azur, CS 34229, F-06304 Nice, France;Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile.;Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile. Côte d'Azur Observatory (creator_code:org_t)
- 2017-05-22
- 2017
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 601
- Relaterad länk:
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https://www.aanda.or...
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Context. As observational evidence steadily accumulates, the nature of the Galactic bulge has proven to be rather complex: the structural, kinematic, and chemical analyses often lead to contradictory conclusions. The nature of the metal-rich bulge-and especially of the metal-poor bulge and their relation with other Galactic components, still need to be firmly defined on the basis of statistically significant high-quality data samples. Aims. We used the fourth internal data release of the Gaia-ESO survey to characterize the bulge metallicity distribution function (MDF), magnesium abundance, spatial distribution, and correlation of these properties with kinematics. Moreover, the homogeneous sampling of the different Galactic populations provided by the Gaia-ESO survey allowed us to perform a comparison between the bulge, thin disk, and thick disk sequences in the [Mg /Fe] vs. [Fe/H] plane in order to constrain the extent of their eventual chemical similarities. Methods. We obtained spectroscopic data for similar to 2500 red clump stars in 11 bulge fields, sampling the area -10 degrees <= l <= + 8 degrees and -10 degrees <= b <= -4 degrees from the fourth internal data release of the Gaia-ESO survey. A sample of similar to 6300 disk stars was also selected for comparison. Spectrophotometric distances computed via isochrone fitting allowed us to define a sample of stars likely located in the bulge region. Results. From a Gaussian mixture models (GMM) analysis, the bulge MDF is confirmed to be bimodal across the whole sampled area. The relative ratio between the two modes of the MDF changes as a function of b, with metal-poor stars dominating at high latitudes. The metal-rich stars exhibit bar-like kinematics and display a bimodality in their magnitude distribution, a feature which is tightly associated with the X-shape bulge. They overlap with the metal-rich end of the thin disk sequence in the [Mg/Fe] vs. [Fe/H] plane. On the other hand, metal-poor bulge stars have a more isotropic hot kinematics and do not participate in the X-shape bulge. Their Mg enhancement level and general shape in the [Mg/Fe] vs. [Fe/H] plane is comparable to that of the thick disk sequence. The position at which [Mg/Fe] starts to decrease with [Fe/H], called the "knee", is observed in the metal-poor bulge at [Fe/H] knee = -0.37 +/- 0.09, being 0.06 dex higher than that of the thick disk. Although this difference is inside the error bars, it suggest a higher star formation rate (SFR) for the bulge than for the thick disk. We estimate an upper limit for this difference of Delta [Fe/H](knee) = 0 : 24 dex. Finally, we present a chemical evolution model that suitably fits the whole bulge sequence by assuming a fast (< 1 Gyr) intense burst of stellar formation that takes place at early epochs. Conclusions. We associate metal-rich stars with the bar boxy/peanut bulge formed as the product of secular evolution of the early thin disk. On the other hand, the metal-poor subpopulation might be the product of an early prompt dissipative collapse dominated by massive stars. Nevertheless, our results do not allow us to firmly rule out the possibility that these stars come from the secular evolution of the early thick disk. This is the first time that an analysis of the bulge MDF and alpha-abundances has been performed in a large area on the basis of a homogeneous, fully spectroscopic analysis of high-resolution, high S/N data.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: bulge
- Galaxy: formation
- Galaxy: abundances
- Galaxy: stellar content
- stars: abundances
- Galaxy: abundances
- Galaxy: bulge
- Galaxy: formation
- Galaxy: stellar content
- Stars: abundances
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Rojas-Arriagada, ...
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Recio-Blanco, A.
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de laverny, P.
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Mikolaitis, S.
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Matteucci, F.
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Spitoni, E.
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visa fler...
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Schultheis, M.
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Hayden, M.
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Hill, V.
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Zoccali, M.
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Minniti, D.
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Gonzalez, O. A.
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Gilmore, G.
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Randich, S.
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Feltzing, S.
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Alfaro, E. J.
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Babusiaux, C.
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Bensby, T.
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Bragaglia, A.
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Flaccomio, E.
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Koposov, S. E.
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Pancino, E.
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Bayo, A.
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Carraro, G.
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Casey, A. R.
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Costado, M. T.
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Damiani, F.
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Donati, P.
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Franciosini, E.
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Hourihane, A.
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Jofre, P.
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Lardo, C.
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Lewis, J.
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Lind, K.
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Magrini, L.
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Morbidelli, L.
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Sacco, G. G.
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Worley, C. C.
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Zaggia, S.
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