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Stream-subhalo interactions in the Aquarius simulations

Sanderson, R. E. and Vera-Ciro, C. and Helmi, A. and Heit, J. (2016) Stream-subhalo interactions in the Aquarius simulations. . (Submitted)

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Aims. We perform the first self-consistent measurement of the rate of interactions between stellar tidal streams created by disrupting satellites and dark subhalos in a cosmological simulation of a Milky-Way-mass galaxy. Methods. Using a retagged version of the Aquarius A dark-matter-only simulation, we selected 18 streams of tagged star particles that appear thin at the present day and followed them from the point their progenitors accrete onto the main halo, recording in each snapshot the characteristics of all dark-matter subhalos passing within several distance thresholds of any tagged star particle in each stream. We considered distance thresholds corresponding to constant impact parameters (1, 2, and 5 kpc), as well as those proportional to the region of influence of each subhalo (one and two times its half-mass radius r1=2). We then measured the age and present-day, phase-unwrapped length of each stream in order to compute the interaction rate in different mass bins and for different thresholds, and compared these to analytic predictions from the literature. Results. We measure a median rate of 1.5^(+3.0)_(-1.1) (9.1^(+17.5)_(-7.1), 61.8^(+211)_(-40.6)) interactions within 1 (2, 5) kpc of the stream per 10 kpc of stream length per 10 Gyr. Resolution effects (both time and particle number) affect these estimated rates by lowering them.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Sanderson, R. E.0000-0003-3939-3297
Additional Information:Submitted on 19 Aug 2016. RES is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1400989. RES and AH gratefully acknowledge support from the European Research Council under ERC-Starting Grant GALACTICA-240271. AH is also supported by a VICI grant from NWO.
Funding AgencyGrant Number
NSF Astronomy and Astrophysics FellowshipAST-1400989
European Research Council (ERC)GALACTICA-240271
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Subject Keywords:Galaxy: halo – Galaxy: kinematics and dynamics – (cosmology:) dark matter – Galaxy: structure – galaxies: interactions – methods: numerical
Record Number:CaltechAUTHORS:20161114-171336923
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72012
Deposited By: Melissa Ray
Deposited On:21 Nov 2016 19:28
Last Modified:06 Feb 2020 23:42

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