Stellar dynamics around transient co-rotating spiral arms
Spiral density wave theory attempts to describe the spiral pattern in spiral galaxies in terms of a long-lived wave structure with a constant pattern speed in order to avoid the winding dilemma. The pattern is consequently a rigidly rotating, long-lived feature. We run an N-body/SPH simulation of a...
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EDP Sciences
2012-02-01
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Series: | EPJ Web of Conferences |
Online Access: | http://dx.doi.org/10.1051/epjconf/20121907006 |
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doaj-d9b1cb44dd6c42f9bbf54b5cf835459f2021-08-02T03:44:40ZengEDP SciencesEPJ Web of Conferences2100-014X2012-02-01190700610.1051/epjconf/20121907006Stellar dynamics around transient co-rotating spiral armsCropper M.Grand R.J.J.Kawata D.Spiral density wave theory attempts to describe the spiral pattern in spiral galaxies in terms of a long-lived wave structure with a constant pattern speed in order to avoid the winding dilemma. The pattern is consequently a rigidly rotating, long-lived feature. We run an N-body/SPH simulation of a Milky Way-sized barred disk, and find that the spiral arms are transient features whose pattern speeds decrease with radius, in such a way that the pattern speed is almost equal to the rotation curve of the galaxy. We trace particle motion around the spiral arms. We show that particles from behind and in front of the spiral arm are drawn towards and join the arm. Particles move along the arm in the radial direction and we find a clear trend that they migrate toward the outer (inner) radii on the trailing (leading) side of the arm. Our simulations demonstrate that tat all radii where there is a co-rotating spiral arm the particles continue to be accelerated (decelerated) by the spiral arm for long periods, which leads to strong migration. http://dx.doi.org/10.1051/epjconf/20121907006 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Cropper M. Grand R.J.J. Kawata D. |
spellingShingle |
Cropper M. Grand R.J.J. Kawata D. Stellar dynamics around transient co-rotating spiral arms EPJ Web of Conferences |
author_facet |
Cropper M. Grand R.J.J. Kawata D. |
author_sort |
Cropper M. |
title |
Stellar dynamics around transient co-rotating spiral arms |
title_short |
Stellar dynamics around transient co-rotating spiral arms |
title_full |
Stellar dynamics around transient co-rotating spiral arms |
title_fullStr |
Stellar dynamics around transient co-rotating spiral arms |
title_full_unstemmed |
Stellar dynamics around transient co-rotating spiral arms |
title_sort |
stellar dynamics around transient co-rotating spiral arms |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2012-02-01 |
description |
Spiral density wave theory attempts to describe the spiral pattern in spiral galaxies in terms of a long-lived wave structure with a constant pattern speed in order to avoid the winding dilemma. The pattern is consequently a rigidly rotating, long-lived feature. We run an N-body/SPH simulation of a Milky Way-sized barred disk, and find that the spiral arms are transient features whose pattern speeds decrease with radius, in such a way that the pattern speed is almost equal to the rotation curve of the galaxy. We trace particle motion around the spiral arms. We show that particles from behind and in front of the spiral arm are drawn towards and join the arm. Particles move along the arm in the radial direction and we find a clear trend that they migrate toward the outer (inner) radii on the trailing (leading) side of the arm. Our simulations demonstrate that tat all radii where there is a co-rotating spiral arm the particles continue to be accelerated (decelerated) by the spiral arm for long periods, which leads to strong migration. |
url |
http://dx.doi.org/10.1051/epjconf/20121907006 |
work_keys_str_mv |
AT cropperm stellardynamicsaroundtransientcorotatingspiralarms AT grandrjj stellardynamicsaroundtransientcorotatingspiralarms AT kawatad stellardynamicsaroundtransientcorotatingspiralarms |
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