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the pristine inner galaxy survey pigs i tracing the kinematics of metal poor stars in the galactic bulge

descriptionPublicationkeyboard_double_arrow_right Article , Journal 18 Oct 2019Embargo end date: 01 Jan 2019 Canada, France, Italy, Switzerland Publisher:Oxford University Press (OUP)Journal:Monthly Notices of the Royal Astronomical Society: Letters, volume 491, pages L11-L16 (issn: 1745-3925, eissn: 1745-3933,

Authors: Geraint F. Lewis; G. F. Thomas; Carmela Lardo; Rubén Sánchez-Janssen; Federico Sestito; J. I. González Hernández; J. I. González Hernández; +17 Authors

doi: 10.1093/mnrasl/slz156 , 10.48550/arxiv.1910.06337

handle: 11585/791715

the pristine inner galaxy survey pigs i tracing the kinematics of metal poor stars in the galactic bulge

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Abstract

ABSTRACT Our Galaxy is known to contain a central boxy/peanut-shaped bulge, yet the importance of a classical, pressure-supported component within the central part of the Milky Way is still being debated. It should be most visible at low metallicity, a regime that has not yet been studied in detail. Using metallicity-sensitive narrow-band photometry, the Pristine Inner Galaxy Survey (PIGS) has collected a large sample of metal-poor ($\rm {[Fe/H]}\, \lt -1.0$) stars in the inner Galaxy to address this open question. We use PIGS to trace the metal-poor inner Galaxy kinematics as function of metallicity for the first time. We find that the rotational signal decreases with decreasing [Fe/H] , until it becomes negligible for the most metal-poor stars. Additionally, the velocity dispersion increases with decreasing metallicity for $-3.0 \lt \rm {[Fe/H]}\, \lt -0.5$, with a gradient of −44 ± 4 km s−1 dex−1. These observations may signal a transition between Galactic components of different metallicities and kinematics, a different mapping on to the boxy/peanut-shaped bulge for former disc stars of different metallicities and/or the secular dynamical and gravitational influence of the bar on the pressure-supported component. Our results provide strong constraints on models that attempt to explain the properties of the inner Galaxy.

Countries

Canada, France, Italy, Switzerland

Related Organizations

Université Paris Diderot
France
Leibniz Association
Germany
Max Planck Institute for Heart and Lung Research
Germany
Macquarie University
Australia
Observatory of Strasbourg
France

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Keywords

photometry, galaxy: evolution, bulge -Galaxy, kinematics and dynamics -Galaxy, formation -Galaxy, FOS: Physical sciences, Galaxy: Bulge; Galaxy: Evolution; Galaxy: Formation; Galaxy: Halo; Galaxy: Kinematics and dynamics; Galaxy: Structure, Galaxy: bulge, Galaxy: Structure, galaxy: bulge, galaxy: formation, Galaxy: Evolution, galaxy: halo, structure, Galaxy: structure, Galaxy: Halo, milky-way, halo -Galaxy, Solar and Stellar Astrophysics (astro-ph.SR), Galaxy: evolution, Galaxy: Kinematics and dynamic, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], stellar populations, Galaxy: Formation, Galaxy: Bulge, argos, Astrophysics - Astrophysics of Galaxies, evolution -Galaxy, Galaxy: halo, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], galaxy: structure, Galaxy, [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], Astrophysics - Solar and Stellar Astrophysics, Galaxy: formation, Astrophysics of Galaxies (astro-ph.GA), galaxy: kinematics and dynamics, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Galaxy: kinematics and dynamics

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Bars and Boxy/Peanut-Shaped Bulges: An Observational Point of View
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Secular evolution in action: central values and radial trends in the stellar populations of boxy bulges
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Formation of Boxy/Peanut-Shaped Bulges in Spiral Galaxies: Accretion or Bar Instability?
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