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Radial migration in numerical simulations of Milky-Way sized galaxies

Grand, RJJ and Kawata, D (2016) Radial migration in numerical simulations of Milky-Way sized galaxies. Astronomische Nachrichten, 337 (8-9). pp. 957-960. ISSN 0004-6337

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We show that in rmN -body simulations of isolated spiral discs, spiral arms appear to transient, recurring features that co-rotate with the stellar disc stars at all radii. As a consequence, stars around the spiral arm continually feel a tangential force from the spiral and gain/lose angular momentum at all radii where spiral structure exists, without gaining significant amounts of random energy. We demonstrate that the ubiquitous radial migration in these simulations can be seen as outward (inward) systematic streaming motions along the trailing (leading) side of the spiral arms. We characterise these spiral induced peculiar motions and compare with those of the Milky Way obtained from APOGEE red clump data. We find that transient, co-rotating spiral arms are consistent with the data, in contrast with density wave-like spirals which are qualitatively inconsistent. In addition, we show that, in our simulations, radial migration does not change the radial metallicity gradient significantly, and broadens the metallicity distribution function at all radii, similar to some previous studies.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Grand, R.J.J. and Kawata, D. (2016), Radial migration in numerical simulations of Milky-Way sized galaxies. Astron. Nachr., 337: 957-960., which has been published in final form at https://doi.org/10.1002/asna.201612407. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Wiley
SWORD Depositor: A Symplectic
Date Deposited: 19 Apr 2023 11:01
Last Modified: 19 Apr 2023 11:01
DOI or ID number: 10.1002/asna.201612407
URI: https://researchonline.ljmu.ac.uk/id/eprint/19350
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