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Using action space ...
Using action space clustering to constrain the recent accretion history of Milky Way-like galaxies
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- Wu, Youjia (author)
- Univ Michigan, Dept Phys, Leinweber Ctr Theoret Phys, Ann Arbor, MI 48109 USA.
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- Valluri, Monica (author)
- Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA.
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- Panithanpaisal, Nondh (author)
- Univ Penn, Dept Phys & Astron, 209 S 33rd St, Philadelphia, PA 19104 USA.
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- Sanderson, Robyn E. (author)
- Univ Penn, Dept Phys & Astron, 209 S 33rd St, Philadelphia, PA 19104 USA.;Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA.
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- Freese, Katherine (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Univ Texas Austin, Dept Phys, Theory Grp, 2515 Speedway, 600, Austin, TX 78712 USA.;Stockholm Univ, Dept Phys, Oskar Klein Ctr, AlbaNova, SE-10691 Stockholm, Sweden.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Nordiska institutet för teoretisk fysik (Nordita),The University of Texas at Austin, USA
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- Wetzel, Andrew (author)
- Univ Calif Davis, Dept Phys & Astron, Davis, CA 95616 USA.
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- Sharma, Sanjib (author)
- Ctr Excellence Astrophys Three Dimens ASTRO 3D, Melbourne, Vic, Australia.;Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.
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Univ Michigan, Dept Phys, Leinweber Ctr Theoret Phys, Ann Arbor, MI 48109 USA Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA. (creator_code:org_t)
- 2021-11-17
- 2021
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 509:4, s. 5882-5901
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Abstract
Subject headings
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- In the currently favoured cosmological paradigm galaxies form hierarchically through the accretion of satellites. Since a satellite is less massive than the host, its stars occupy a smaller volume in action space. Actions are conserved when the potential of the host halo changes adiabatically, so stars from an accreted satellite would remain clustered in action space as the host evolves. In this paper, we identify recently disrupted accreted satellites in three Milky Way-like disc galaxies from the cosmological baryonic FIRE-2 simulations by tracking satellites through simulation snapshots. We try to recover these satellites by applying the cluster analysis algorithm Enlink to the orbital actions of accreted star particles in the z = 0 snapshot. Even with completely error-free mock data we find that only 35 per cent (14/39) satellites are well recovered while the rest (25/39) are poorly recovered (i.e. either contaminated or split up). Most (10/14 similar to 70 per cent) of the well-recovered satellites have infall times <7.1 Gyr ago and total mass >4 x10(8) M-circle dot (stellar mass more than 1.2 x10(6) M-circle dot, although our upper mass limit is likely to be resolution dependent). Since cosmological simulations predict that stellar haloes include a population of in situ stars, we test our ability to recover satellites when the data include 10-50 per cent in situ contamination. We find that most previously well-recovered satellites stay well recovered even with 50 per cent contamination. With the wealth of 6D phase space data becoming available we expect that cluster analysis in action space will be useful in identifying the majority of recently accreted and moderately massive satellites in the Milky Way.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: data analysis
- methods: statistical
- stars: kinematics and dynamics
- galaxies: formation
- galaxies: haloes
Publication and Content Type
- ref (subject category)
- art (subject category)
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