NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T02:27:01 PDT
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For refcode 2016MNRAS.456.4432S:
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NED Abstract

Copyright by Royal Astronomical Society. 2016MNRAS.456.4432S The transverse velocity of the Andromeda system, derived from the M31 satellite population Salomon, J.-B.; Ibata, R. A.; Famaey, B.; Martin, N. F.; Lewis, G. F. Abstract. We present a dynamical measurement of the tangential motion of the Andromeda system, the ensemble consisting of the Andromeda galaxy (M31) and its satellites. The system is modelled as a structure with cosmologically motivated velocity dispersion and density profiles, and we show that our method works well when tested using the most massive substructures in high-resolution Lambda cold dark matter (LambdaCDM) simulations. Applied to the sample of 40 currently known galaxies of this system, we find a value for the velocity along the East and North directions of v_East_ = -111.5 +/- 70.2 km s^-1^ and v_North_ = 99.4 +/- 60.0 km s^-1^, implying a transverse velocity significantly higher than previous estimates of the proper motion of M31 itself. This result has significant implications on estimates of the mass of the Local Group, as well as on its past and future history. Key words: galaxies: dwarf, Local Group
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