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Exploring the stell...
Exploring the stellar age distribution of the milky way bulge using APOGEE
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- Hasselquist, Sten (författare)
- University of Utah
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- Zasowski, Gail (författare)
- University of Utah
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- Feuillet, Diane K. (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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- Schultheis, Mathias (författare)
- Côte d'Azur Observatory
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- Nataf, David M. (författare)
- Johns Hopkins University Krieger School of Arts and Sciences
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- Anguiano, Borja (författare)
- University of Virginia
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- Beaton, Rachael L. (författare)
- Carnegie Observatories,Princeton University
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- Beers, Timothy C. (författare)
- University of Notre Dame
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- Cohen, Roger E. (författare)
- Space Telescope Science Institute
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- Cunha, Katia (författare)
- National Observatory Brazil,University of Arizona
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- Fernández-Trincado, José G. (författare)
- University of Atacama
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- García-Hernández, D. A. (författare)
- University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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- Geisler, Doug (författare)
- Universidad de La Serena,University of Concepción
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- Holtzman, Jon A. (författare)
- New Mexico State University
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- Johnson, Jennifer (författare)
- Ohio State University
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- Lane, Richard R. (författare)
- Pontifical Catholic University of Chile,University of Atacama
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- Majewski, Steven R. (författare)
- University of Virginia
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- Bidin, Christian Moni (författare)
- European Commission Joint Research Centre, Ispra
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- Nitschelm, Christian (författare)
- University of Antofagasta
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- Roman-Lopes, Alexandre (författare)
- Universidad de La Serena
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- Schiavon, Ricardo (författare)
- Liverpool John Moores University
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- Smith, Verne V. (författare)
- National Optical Astronomy Observatory
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- Sobeck, Jennifer (författare)
- University of Washington
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(creator_code:org_t)
- 2020-09-28
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 901:2
- Relaterad länk:
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http://dx.doi.org/10... (free)
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http://arxiv.org/pdf...
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https://lup.lub.lu.s...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We present stellar age distributions of the Milky Way bulge region using ages for ∼6000 high-luminosity (log(g)< 2.0), metal-rich ([Fe/H] ≥ -0.5) bulge stars observed by the Apache Point Observatory Galactic Evolution Experiment. Ages are derived using The Cannon label-transfer method, trained on a sample of nearby luminous giants with precise parallaxes for which we obtain ages using a Bayesian isochrone-matching technique. We find that the metal-rich bulge is predominantly composed of old stars (>8 Gyr). We find evidence that the planar region of the bulge (ZGC| 0.25 kpc) is enriched in metallicity, Z, at a faster rate (dZ/dt ∼ 0.0034 Gyr-1) than regions farther from the plane (dZ/dt ∼ 0.0013 Gyr-1 at | ZGC| > 1.00 kpc). We identify a nonnegligible fraction of younger stars (age ∼2-5 Gyr) at metallicities of +0.2 < [Fe/H] < +0.4. These stars are preferentially found in the plane (ZGC| ≤ 0.25 kpc) and at R cy ≈ 2-3 kpc, with kinematics that are more consistent with rotation than are the kinematics of older stars at the same metallicities. We do not measure a significant age difference between stars found inside and outside the bar. These findings show that the bulge experienced an initial starburst that was more intense close to the plane than far from the plane. Then, star formation continued at supersolar metallicities in a thin disk at 2 kpc ≲ R cy ≲ 3 kpc until ∼2 Gyr ago.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (ämneskategori)
- ref (ämneskategori)
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Hasselquist, Ste ...
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Zasowski, Gail
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Feuillet, Diane ...
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Schultheis, Math ...
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Nataf, David M.
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Anguiano, Borja
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Beaton, Rachael ...
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Beers, Timothy C ...
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Cohen, Roger E.
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Cunha, Katia
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Fernández-Trinca ...
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García-Hernández ...
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Geisler, Doug
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Holtzman, Jon A.
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Johnson, Jennife ...
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Lane, Richard R.
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Majewski, Steven ...
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Bidin, Christian ...
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Nitschelm, Chris ...
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Roman-Lopes, Ale ...
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Schiavon, Ricard ...
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Smith, Verne V.
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Sobeck, Jennifer
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