• Login
    View Item 
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    •   Home
    • UA Faculty Research
    • UA Faculty Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Nidever_2020_ApJ_895_88.pdf
    Size:
    4.525Mb
    Format:
    PDF
    Description:
    Final Published Version
    Download
    Author
    Nidever, David L.
    Hasselquist, Sten
    Hayes, Christian R.
    Hawkins, Keith
    Povick, Joshua
    Majewski, Steven R.
    Smith, Verne V.
    Anguiano, Borja
    Stringfellow, Guy S.
    Sobeck, Jennifer S.
    Cunha, Katia
    Beers, Timothy C. cc
    Bestenlehner, Joachim M.
    Cohen, Roger E.
    Garcia-Hernandez, D. A.
    Jönsson, Henrik
    Nitschelm, Christian
    Shetrone, Matthew
    Lacerna, Ivan cc
    Allende Prieto, Carlos
    Beaton, Rachael L.
    Dell’Agli, Flavia
    Fernández-Trincado, José G.
    Feuillet, Diane cc
    Gallart, Carme cc
    Hearty, Fred R.
    Holtzman, Jon
    Manchado, Arturo cc
    Muñoz, Ricardo R.
    O’Connell, Robert
    Rosado, Margarita
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2020-05-28
    Keywords
    Magellanic Clouds
    Galaxy abundances
    Local Group
    Surveys
    Star formation
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Nidever, D. L., Hasselquist, S., Hayes, C. R., Hawkins, K., Povick, J., Majewski, S. R., ... & Rosado, M. (2020). The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds. The Astrophysical Journal, 895(2), 88.
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2020. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    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.
    ISSN
    0004-637X
    EISSN
    1538-4357
    DOI
    10.3847/1538-4357/ab7305
    Version
    Final published version
    Sponsors
    European Regional Development Fund
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab7305
    Scopus Count
    Collections
    UA Faculty Publications

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.