The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars
Abstract
In this paper, we study the mass spectrum of destroyed dwarfs that contribute to the accreted stellar mass of Milky Way (MW)-mass (Mvir ~ 1012.1 M⊙) halos using a suite of 45 zoom-in dissipationless simulations. Empirical models are employed to relate (peak) subhalo mass to dwarf stellar mass, and we use constraints from z = 0 observations and hydrodynamical simulations to estimate the metallicity distribution of the accreted stellar material. The dominant contributors to the accreted stellar mass are relatively massive dwarfs with Mstar ~ 108–1010M⊙. Halos with more quiescent accretion histories tend to have lower mass progenitors (108–109 M⊙), and lower overall accreted stellar masses. Ultra-faint mass (Mstar < 105 M⊙) dwarfs contribute a negligible amount (<<1%) to the accreted stellar mass and, despite having low average metallicities, supply a small fraction (~2%–5%) of the very metal-poor stars with [Fe/H] < -2. Dwarfs with masses 105 < Mstar/M⊙ < 108 provide a substantial amount of the very metal-poor stellar material (~40%–80%), and even relatively metal-rich dwarfs with Mstar > 108 M⊙ can contribute a considerable fraction (~20%–60%) of metal-poor stars if their metallicity distributions have significant metal-poor tails. Finally, we find that the generic assumption of a quiescent assemblymore »
- Authors:
-
- Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology and Physics Dept.; SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1237023
- Report Number(s):
- SLAC-PUB-16470
Journal ID: ISSN 1538-4357; arXiv:1601.07905
- Grant/Contract Number:
- AC02-76SF00515; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 821; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxy formation; halo; stellar content; dwarf; interactions; Local Group
Citation Formats
Deason, Alis J., Mao, Yao-Yuan, and Wechsler, Risa H. The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars. United States: N. p., 2016.
Web. doi:10.3847/0004-637X/821/1/5.
Deason, Alis J., Mao, Yao-Yuan, & Wechsler, Risa H. The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars. United States. https://doi.org/10.3847/0004-637X/821/1/5
Deason, Alis J., Mao, Yao-Yuan, and Wechsler, Risa H. Fri .
"The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars". United States. https://doi.org/10.3847/0004-637X/821/1/5. https://www.osti.gov/servlets/purl/1237023.
@article{osti_1237023,
title = {The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars},
author = {Deason, Alis J. and Mao, Yao-Yuan and Wechsler, Risa H.},
abstractNote = {In this paper, we study the mass spectrum of destroyed dwarfs that contribute to the accreted stellar mass of Milky Way (MW)-mass (Mvir ~ 1012.1 M⊙) halos using a suite of 45 zoom-in dissipationless simulations. Empirical models are employed to relate (peak) subhalo mass to dwarf stellar mass, and we use constraints from z = 0 observations and hydrodynamical simulations to estimate the metallicity distribution of the accreted stellar material. The dominant contributors to the accreted stellar mass are relatively massive dwarfs with Mstar ~ 108–1010M⊙. Halos with more quiescent accretion histories tend to have lower mass progenitors (108–109 M⊙), and lower overall accreted stellar masses. Ultra-faint mass (Mstar < 105 M⊙) dwarfs contribute a negligible amount (<<1%) to the accreted stellar mass and, despite having low average metallicities, supply a small fraction (~2%–5%) of the very metal-poor stars with [Fe/H] < -2. Dwarfs with masses 105 < Mstar/M⊙ < 108 provide a substantial amount of the very metal-poor stellar material (~40%–80%), and even relatively metal-rich dwarfs with Mstar > 108 M⊙ can contribute a considerable fraction (~20%–60%) of metal-poor stars if their metallicity distributions have significant metal-poor tails. Finally, we find that the generic assumption of a quiescent assembly history for the MW halo seems to be in tension with the mass spectrum of its surviving dwarfs. In conclusion, we suggest that the MW could be a "transient fossil"; a quiescent halo with a recent accretion event(s) that disguises the preceding formation history of the halo.},
doi = {10.3847/0004-637X/821/1/5},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 821,
place = {United States},
year = {Fri Apr 01 00:00:00 EDT 2016},
month = {Fri Apr 01 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
The first all-sky view of the Milky Way stellar halo with Gaia+2MASS RR Lyrae
journal, October 2017
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The formation and assembly history of the Milky Way revealed by its globular cluster population
journal, June 2018
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The shape of the Galactic halo with Gaia DR2 RR Lyrae. Anatomy of an ancient major merger
journal, October 2018
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- Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 3
The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud
journal, November 2018
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- Monthly Notices of the Royal Astronomical Society, Vol. 483, Issue 2
Quantifying the smoothness of the stellar halo: a link to accretion history
journal, January 2019
- Lancaster, Lachlan; Belokurov, Vasily; Evans, N. Wyn
- Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 2
The origin of galactic metal-rich stellar halo components with highly eccentric orbits
journal, January 2019
- Fattahi, Azadeh; Belokurov, Vasily; Deason, Alis J.
- Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 4
The total stellar halo mass of the Milky Way
journal, October 2019
- Deason, Alis J.; Belokurov, Vasily; Sanders, Jason L.
- Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 3
The Pristine Survey – VIII. The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
journal, January 2020
- Youakim, K.; Starkenburg, E.; Martin, N. F.
- Monthly Notices of the Royal Astronomical Society, Vol. 492, Issue 4
The Auriga stellar haloes: connecting stellar population properties with accretion and merging history
journal, February 2019
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Elemental Abundances in M31: The Kinematics and Chemical Evolution of Dwarf Spheroidal Satellite Galaxies
journal, January 2020
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To the Galactic Virial Radius with Hyper Suprime-Cam
journal, January 2018
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StarGO: A New Method to Identify the Galactic Origins of Halo Stars
journal, August 2018
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Stellar Populations in the Outer Disk and Halo of the Spiral Galaxy M101
journal, July 2018
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The Proper Motion Field of the Small Magellanic Cloud: Kinematic Evidence for Its Tidal Disruption
journal, August 2018
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The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of Nuclear Star Clusters over Seven Decades in Galaxy Mass
journal, June 2019
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The Origin of r -process Enhanced Metal-poor Halo Stars In Now-destroyed Ultra-faint Dwarf Galaxies
journal, February 2019
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Elemental Abundances in M31: First Alpha and Iron Abundance Measurements in M31's Giant Stellar Stream
journal, September 2019
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Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way
journal, September 2019
- Necib, Lina; Lisanti, Mariangela; Garrison-Kimmel, Shea
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Resolving the Metallicity Distribution of the Stellar Halo with the H3 Survey
journal, December 2019
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Elemental Abundances in M31: A Comparative Analysis of Alpha and Iron Element Abundances in the the Outer Disk, Giant Stellar Stream, and Inner Halo of M31
journal, February 2020
- Escala, Ivanna; Gilbert, Karoline M.; Kirby, Evan N.
- The Astrophysical Journal, Vol. 889, Issue 2
The total stellar halo mass of the Milky Way
text, January 2019
- Deason, Alis J.; Belokurov, Vasily; Sanders, Jason
- Apollo - University of Cambridge Repository
Quantifying the smoothness of the stellar halo: A link to accretion history
text, January 2019
- Lancaster, L.; Belokurov, Vasily; Wyn Evans, N.
- Apollo - University of Cambridge Repository
Empirical Determination of Dark Matter Velocities using Metal-Poor Stars
text, January 2017
- Herzog-Arbeitman, Jonah; Lisanti, Mariangela; Madau, Piero
- arXiv
StarGO: A New Method to Identify the Galactic Origins of Halo Stars
text, January 2018
- Yuan, Zhen; Chang, Jiang; Banerjee, Projjwal
- arXiv
Stellar Populations in the Outer Disk and Halo of the Spiral Galaxy M101
text, January 2018
- Mihos, J. Christopher; Durrell, Patrick R.; Feldmeier, John J.
- arXiv
The shape of the Galactic halo with $Gaia$ DR2 RR Lyrae. Anatomy of an ancient major merger
text, January 2018
- Iorio, G.; Belokurov, V.
- arXiv
The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud
text, January 2018
- Cautun, Marius; Deason, Alis J.; Frenk, Carlos S.
- arXiv
Under the Firelight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way
text, January 2018
- Necib, Lina; Lisanti, Mariangela; Garrison-Kimmel, Shea
- arXiv
The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of nuclear star clusters over seven decades in galaxy mass
text, January 2018
- Sánchez-Janssen, R.; Côté, P.; Ferrarese, L.
- arXiv
Elemental Abundances in M31: A Comparative Analysis of Iron and Alpha Element Abundances in the Outer Disk, Giant Stellar Stream, and Inner Halo of M31
text, January 2019
- Escala, Ivanna; Gilbert, Karoline M.; Kirby, Evan N.
- arXiv
The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
text, January 2020
- Youakim, K.; Starkenburg, E.; Martin, N. F.
- arXiv