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A view of the Galactic bar in the Gaia space of observables

Published online by Cambridge University Press:  17 July 2015

M. Romero-Gómez ,
F. Figueras ,
T. Antoja ,
H. Abedi  and
L. Aguilar
M. Romero-Gómez
Affiliation:
Dept. d'Astronomia i Meteorologia, Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC, Martí i Franquès 1, 08028 Barcelona, Spain
F. Figueras
Affiliation:
Dept. d'Astronomia i Meteorologia, Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC, Martí i Franquès 1, 08028 Barcelona, Spain
T. Antoja
Affiliation:
Research and Scientific Support Office, European Space Agency (ESA-ESTEC), PO Box 299, 2200 AG Noordwijk, The Netherlands
H. Abedi
Affiliation:
Dept. d'Astronomia i Meteorologia, Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC, Martí i Franquès 1, 08028 Barcelona, Spain
L. Aguilar
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de Mexico, Apdo. Postal 877, Ensenada, 22800 Baja California, Mexico
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Abstract

We use a 3D test particle simulation evolved under a potential that includes a Galactic bar. The test particles are given the properties of the disc Red Clump stars in order to convolve with the Gaia errors and to generate a mock catalogue with the stars up to Gaia magnitude, G, 20. In this work, we work in the space of Gaia observables, that is, trigonometric parallaxes. Thus, we show first how the bar structure is mapped in the parallax cartesian space derived from (parallax, galactic longitude). Secondly, we show the effect of the magnitude cut and the introduction o the Gaia errors. Finally, we also consider other possible error sources, for instance from IR photometric distances.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 87 - 90
Copyright
© EAS, EDP Sciences, 2015

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References

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