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The Lazy Giants :
The Lazy Giants : APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds
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- Nidever, David L. (författare)
- Montana State University
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- Hasselquist, Sten (författare)
- University of Utah
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- Hayes, Christian R. (författare)
- University of Virginia
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- Hawkins, Keith (författare)
- University of Texas at Austin
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- Povick, Joshua (författare)
- Montana State University
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- Majewski, Steven R. (författare)
- University of Virginia
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Smith, Verne V. (författare)
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- Anguiano, Borja (författare)
- University of Virginia
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- Stringfellow, Guy S. (författare)
- University of Colorado
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- Sobeck, Jennifer S. (författare)
- University of Washington
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- Cunha, Katia (författare)
- National Observatory Brazil,University of Arizona
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- Beers, Timothy C. (författare)
- University of Notre Dame
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- Bestenlehner, Joachim M. (författare)
- Max Planck Institute for Astronomy
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- Cohen, Roger E. (författare)
- Space Telescope Science Institute
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- Garcia-Hernandez, D. A. (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
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- Jönsson, Henrik (författare)
- Malmö University,Lund University,Lunds universitet,Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),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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- Nitschelm, Christian (författare)
- University of Antofagasta
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- Shetrone, Matthew (författare)
- University of Texas at Austin
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- Lacerna, Ivan (författare)
- University of Atacama
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- Allende Prieto, Carlos (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
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- Beaton, Rachael L. (författare)
- Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA.;Carnegie Inst Washington Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA.,Princeton University,Carnegie Observatories
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- Dell'Agli, Flavia (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
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- Fernandez-Trincado, Jose G. (författare)
- University of Atacama
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- Feuillet, Diane (författare)
- Max Planck Institute for Astronomy
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- Gallart, Carme (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
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- Hearty, Fred R. (författare)
- Pennsylvania State University
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- Holtzman, Jon (författare)
- New Mexico State University
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- Manchado, Arturo (författare)
- CSIC Spanish National Research Council,University of La Laguna (ULL),Instituto de Astrofísica de Canarias
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Munoz, Ricardo R. (författare)
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- O'Connell, Robert (författare)
- University of Virginia
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- Rosado, Margarita (författare)
- National Autonomous University of Mexico
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- Muñoz, Ricardo R. (författare)
- University of Chile
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(creator_code:org_t)
- 2020-05-28
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : Institute of Physics (IOP). - 0004-637X .- 1538-4357. ; 895:2
- Relaterad länk:
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https://iopscience.i...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- We report the first APOGEE metallicities and alpha-element abundances measured for 3600 red giant stars spanning a large radial range of both the Large (LMC) and Small Magellanic Clouds, the largest Milky Way (MW) dwarf galaxies. Our sample is an order of magnitude larger than that of previous studies and extends to much larger radial distances. These are the first results presented that make use of the newly installed southern APOGEE instrument on the du Pont telescope at Las Campanas Observatory. Our unbiased sample of the LMC spans a large range in metallicity, from [Fe/H] = -0.2 to very metal-poor stars with [Fe/H] -2.5, the most metal-poor Magellanic Cloud (MC) stars detected to date. The LMC [alpha/Fe]-[Fe/H] distribution is very flat over a large metallicity range but rises by similar to 0.1 dex at -1.0 < [Fe/H] less than or similar to -0.5. We interpret this as a sign of the known recent increase in MC star formation activity and are able to reproduce the pattern with a chemical evolution model that includes a recent "starburst." At the metal-poor end, we capture the increase of [alpha/Fe] with decreasing [Fe/H] and constrain the "alpha-knee" to [Fe/H] less than or similar to -2.2 in both MCs, implying a low star formation efficiency of similar to 0.01 Gyr(-1). The MC knees are more metal-poor than those of less massive MW dwarf galaxies such as Fornax, Sculptor, or Sagittarius. One possible interpretation is that the MCs formed in a lower-density environment than the MW, a hypothesis that is consistent with the paradigm that the MCs fell into the MW's gravitational potential only recently.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Magellanic Clouds
- Galaxy abundances
- Local Group
- Surveys
- Star formation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Nidever, David L ...
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Hasselquist, Ste ...
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Hayes, Christian ...
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Hawkins, Keith
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Povick, Joshua
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Majewski, Steven ...
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visa fler...
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Smith, Verne V.
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Anguiano, Borja
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Stringfellow, Gu ...
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Sobeck, Jennifer ...
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Cunha, Katia
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Beers, Timothy C ...
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Bestenlehner, Jo ...
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Cohen, Roger E.
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Garcia-Hernandez ...
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Jönsson, Henrik
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Nitschelm, Chris ...
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Shetrone, Matthe ...
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Lacerna, Ivan
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Allende Prieto, ...
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Beaton, Rachael ...
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Dell'Agli, Flavi ...
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Fernandez-Trinca ...
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Feuillet, Diane
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Gallart, Carme
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Hearty, Fred R.
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Holtzman, Jon
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Manchado, Arturo
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Munoz, Ricardo R ...
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O'Connell, Rober ...
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Rosado, Margarit ...
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Muñoz, Ri ...
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visa färre...
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Malmö universitet
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