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Title:
The Galactic warp as seen from 2MASS survey
Authors:
Robin, A. C.; Reylé, C.; Marshall, D. J.
Affiliation:
AA(Institut UTINAM, Observatoire de Besançon, BP1615, F-25010 Besançon cedex, France), AB(Institut UTINAM, Observatoire de Besançon, BP1615, F-25010 Besançon cedex, France), AC(Département de Physique et Centre de Recherche en Astrophysique de Québec, Université Laval, Québec, G1K 7P4, Canada)
Publication:
Astronomische Nachrichten, Vol.329, Issue , p.1012 (AN Homepage)
Publication Date:
12/2008
Origin:
AN
Keywords:
Galaxy: kinematics and dynamics, Galaxy: stellar content, Galaxy: structure, ISM: general
DOI:
10.1002/asna.200811084
Bibliographic Code:
2008AN....329.1012R

Abstract

The 2MASS survey is used to trace the shape of the external Galaxy where an asymmetric warp is detected. We use the Besançon Galaxy model to quantify the parameters of the stellar warp in the outer part of the Galaxy. The shape of the stellar warp is then compared with previous results and with similar structures in gas and dust. We find new constraints on the stellar warp, which is shown to be not symmetrical on both sides of the Galaxy, similar to observations of H I. The positive longitude side is found to be easily modeled with a normal warp but with a slope significantly smaller than the slope seen in the H I warp. At negative longitudes, the warp presents peculiarities which are not well reproduced by any model, even with a 3-Fourier mode warp. Finally, comparing with the warp seen in the dust, it seems to follow a slope intermediate between the gas and the stars.
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