Simulations of the Magellanic Stream in a First Infall Scenario
Gurtina Besla,Nitya Kallivayalil,Lars Hernquist,Roeland P. van der Marel,Thomas J. Cox,Dusan Keres +5 more
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TLDR
In this article, the authors propose an alternative formation mechanism in which material is removed by LMC tides acting on the SMC before the system is accreted by the Milky Way, and demonstrate that it is possible to explain the origin of the Magellanic Stream in a first infall scenario.Abstract:
Recent high precision proper motions from the Hubble Space Telescope (HST) suggest that the Large and Small Magellanic Clouds (LMC and SMC, respectively) are either on their first passage or on an eccentric long period (>6 Gyr) orbit about the Milky Way (MW). This differs markedly from the canonical picture in which the Clouds travel on a quasi-periodic orbit about the MW (period of ~2 Gyr). Without a short period orbit about the MW, the origin of the Magellanic Stream, a young (1-2 Gyr old) coherent stream of HI gas that trails the Clouds ~150 degrees across the sky, can no longer be attributed to stripping by MW tides and/or ram pressure stripping by MW halo gas. We propose an alternative formation mechanism in which material is removed by LMC tides acting on the SMC before the system is accreted by the MW. We demonstrate the feasibility and generality of this scenario using an N-body/SPH simulation with cosmologically motivated initial conditions constrained by the observations. Under these conditions we demonstrate that it is possible to explain the origin of the Magellanic Stream in a first infall scenario. This picture is generically applicable to any gas-rich dwarf galaxy pair infalling towards a massive host or interacting in isolation.read more
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Third-epoch magellanic cloud proper motions. i. hubble space telescope/wfc3 data and orbit implications
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Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications
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References
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On the Orbits of Infalling Satellite Halos
TL;DR: In this paper, the orbital parameters of satellite halos as they merge with larger host halos, focusing primarily on orbital circularity and pericenter, and the implications of these results to the processes of galaxy formation and evolution are discussed.
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Exploring the Origin and Fate of the Magellanic Stream with Ultraviolet and Optical Absorption
Andrew J. Fox,Bart P. Wakker,Jonathan Smoker,Philipp Richter,Blair D. Savage,Kenneth R. Sembach +5 more
TL;DR: In this article, the Magellanic Stream (MS) was detected in low-ion and high-ion absorption using HST/STIS and FUSE ultraviolet spectroscopy of two background AGN, NGC 7469 and Mrk 335.