Grand, RJJ;
Springel, V;
Kawata, D;
Minchev, I;
Sánchez-Blázquez, P;
Gómez, FA;
Marinacci, F;
... Campbell, DJR; + view all
(2016)
Spiral-induced velocity and metallicity patterns in a cosmological zoom simulation of a Milky Way-sized galaxy.
Monthly Notices of the Royal Astronomical Society: Letters
, 460
(1)
L94-L98.
10.1093/mnrasl/slw086.
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Abstract
We use a high resolution cosmological zoom simulation of a Milky Way-sized halo to study the observable features in velocity and metallicity space associated with the dynamical influence of spiral arms. For the first time, we demonstrate that spiral arms, that form in a disc in a fully cosmological environment with realistic galaxy formation physics, drive large-scale systematic streaming motions. In particular, on the trailing edge of the spiral arms the peculiar galacto-centric radial and azimuthal velocity field is directed radially outward and azimuthally backward, whereas it is radially inward and azimuthally forward on the leading edge. Owing to the negative radial metallicity gradient, this systematic motion drives, at a given radius, an azimuthal variation in the residual metallicity that is characterised by a metal rich trailing edge and a metal poor leading edge. We show that these signatures are theoretically observable in external galaxies with Integral Field Unit instruments such as VLT/MUSE, and if detected, would provide evidence for large-scale systematic radial migration driven by spiral arms.
| Type: | Article |
|---|---|
| Title: | Spiral-induced velocity and metallicity patterns in a cosmological zoom simulation of a Milky Way-sized galaxy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnrasl/slw086 |
| Publisher version: | https://doi.org/10.1093/mnrasl/slw086 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | galaxies: evolution, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1491795 |
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