Search for Galactic warp signal in Gaia DR1 proper motions
| Autor: | R. Drimmel, R. L. Smart, Massimiliano Lattanzi, A. Spagna, E. Poggio |
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| Rok vydání: | 2017 |
| Předmět: |
OB star
Computer science Milky Way SIGNAL (programming language) Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astronomy Astronomy and Astrophysics Context (language use) Kinematics Astrometry Galactic plane Astrophysics - Astrophysics of Galaxies Stars Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Proceedings of the International Astronomical Union. 12:185-188 |
| ISSN: | 1743-9221 1743-9213 |
| DOI: | 10.1017/s1743921317006032 |
| Popis: | The nature and origin of the Galactic warp represent one of the open questions posed by Galactic evolution. Thanks to Gaia high precision absolute astrometry, steps towards the understanding of the warp's dynamical nature can be made. Indeed, proper motions for long-lived stable warp are expected to show measurable trends in the component vertical to the galactic plane. Within this context, we search for the kinematic warp signal in the first Gaia data release (DR1). By analyzing distant spectroscopically-identified OB stars in the Hipparcos subset in Gaia DR1, we find that the kinematic trends cannot be explained by a simple model of a long-lived warp. We therefore discuss possible scenarios for the interpretation of the obtained results. We also present current work in progress to select a larger sample of OB star candidates from the Tycho-Gaia Astrometric Solution (TGAS) subsample in DR1, and delineate the points that we will be addressing in the near future. Comment: 4 pages, 3 figures. To appear in the Proceedings of IAU Symposium 330: Astrometry and Astrophysics in the Gaia Sky |
| Databáze: | OpenAIRE |
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