Journal article
Is Terzan 5 the remnant of a building block of the Galactic bulge? Evidence from APOGEE
Monthly notices of the Royal Astronomical Society, Vol.513(3), pp.3429-3443
05/11/2022
DOI: 10.1093/mnras/stac968
Abstract
It has been proposed that the globular cluster-like system Terzan 5 is the surviving remnant of a primordial building block of the Milky Way bulge, mainly due to the age/metallicity spread and the distribution of its stars in the alpha-Fe plane. We employ Sloan Digital Sky Survey data from the Apache Point Observatory Galactic Evolution Experiment to test this hypothesis. Adopting a random sampling technique, we contrast the abundances of 10 elements in Terzan 5 stars with those of their bulge field counterparts with comparable atmospheric parameters, finding that they differ at statistically significant levels. Abundances between the two groups differ by more than 1 sigma in Ca, Mn, C, O, and Al, and more than 2 sigma in Si and Mg. Terzan 5 stars have lower [alpha/Fe] and higher [Mn/Fe] than their bulge counterparts. Given those differences, we conclude that Terzan 5 is not the remnant of a major building block of the bulge. We also estimate the stellar mass of the Terzan 5 progenitor based on predictions by the Evolution and Assembly of GaLaxies and their Environments suite of cosmological numerical simulations, concluding that it may have been as low as similar to 3 x 10(8) M-circle dot so that it was likely unable to significantly influence the mean chemistry of the bulge/inner disc, which is significantly more massive (similar to 10(10) M-circle dot). We briefly discuss existing scenarios for the nature of Terzan 5 and propose an observational test that may help elucidate its origin.
Details
- Title: Subtitle
- Is Terzan 5 the remnant of a building block of the Galactic bulge? Evidence from APOGEE
- Creators
- Dominic J. Taylor - Liverpool John Moores UniversityAndrew C. Mason - Liverpool John Moores UniversityRicardo P. Schiavon - Liverpool John Moores UniversityDanny Horta - Liverpool John Moores UniversityDavid M. Nataf - Johns Hopkins UniversityDoug Geisler - University of La SerenaShobhit Kisku - Liverpool John Moores UniversitySian G. Phillips - Liverpool John Moores UniversityRoger E. Cohen - Space Telescope Science InstituteJose G. Fernandez-Trincado - Universidad Católica del NorteTimothy C. Beers - University of Notre DameDmitry Bizyaev - New Mexico State UniversityDomingo Anibal García-Hernández - Instituto de Astrofísica de CanariasRichard R. Lane - Universidad Bernardo O'HigginsPenelope Longa-Pena - University of AntofagastaDante Minniti - Vatican ObservatoryCesar Munoz - University of La SerenaKaike Pan - New Mexico State UniversitySandro Villanova - Space Telescope Science Institute
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.513(3), pp.3429-3443
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/mnras/stac968
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Number of pages
- 15
- Grant note
- University of Notre Dame New York University Universidad Nacional Autonoma de Mexico University of Utah Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo Lawrence Berkeley National Laboratory; United States Department of Energy (DOE) Ohio State University Vanderbilt University Participating Institutions Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Language
- English
- Date published
- 05/11/2022
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701725102771
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