J/A+A/699/A199 The Great Wave - Young giant sample (Poggio+, 2025)
The Great Wave. Evidence of a large-scale vertical corrugation propagating
outwards in the Galactic disc.
Poggio E., Khanna S., Drimmel R., Zari E., D'Onghia E., Lattanzi M.G.,
Palicio P.A., Recio-Blanco A., Thulasidharan L.
<Astron. Astrophys. 699, A199 (2025)>
=2025A&A...699A.199P 2025A&A...699A.199P (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, luminous ; Stars, giant ; Stars, distances ;
Proper motions ; Optical
Keywords: Galaxy: disk - Galaxy: evolution - Galaxy: kinematics and dynamics -
Galaxy: stellar content - Galaxy: structure
Abstract:
We analyse the three-dimensional structure and kinematics of two
samples of young stars in the Galactic disc, containing respectively
young giants (∼17000 stars out to heliocentric distances of ∼7kpc) and
classical Cepheids (∼3400 stars out to heliocentric distances of
∼15kpc). The vertical structure of the two samples exhibit a
consistent shape of the Milky Way's warp, whose amplitude reaches
∼700pc at a Galactocentric radius R∼14kpc. Moreover, both samples show
evidence of a large-scale vertical corrugation on top of the warp with
a vertical height of ∼150-200pc, extending over a large portion of the
Galactic disc between Galactocentric radii R∼10-12kpc in the third
Galactic quadrant (galactic longitudes 180°<l<270°) and
∼12-14kpc in the second Galactic quadrant (90°<l<180°). Its
total length is at least 10kpc and can possibly reach ∼20kpc with the
Cepheid sample. The stars in the corrugation exhibit both radial and
vertical systematic motions, with Galactocentric radial velocities
towards the outer disc of about 10-15km/s. In the vertical motions,
once the warp signature is subtracted, the residuals show a
large-scale feature of systematically positive vertical velocities,
which is shifted to slightly larger Galactocentric radii with respect
to the spatial vertical corrugation (with a phase difference of
roughly π/2), indicating an oscillatory behaviour. A comparison of
the observed shift with a simple toy model suggests that the
corrugation can be interpreted as a wave propagating towards the outer
disc. The wave mapped in this work is located at larger heliocentric
distances compared to the Radcliffe wave, a ∼2.7kpc filament of dense
gas clouds close to the Sun, and exhibits a larger coverage of the
Galactic disc.
Description:
Young giant sample described in the paper.
This dataset has been selected from the Gaia DR3 catalogue (Gaia
Collaboration, 2023A&A...674A...1G 2023A&A...674A...1G) with the specific objective to
study young populations in the Galactic disc using both spatial and
kinematic information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 93 17030 Catalog
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Gaia DR3 source_id
21- 35 F15.11 deg GLON Galactic longitude
37- 51 F15.11 deg GLAT Galactic latitude
53- 57 F5.2 kpc Dist Distance (calculated as described in the paper)
59- 65 F7.5 kpc e_Dist Distance uncertainty (calculated as described
in the paper)
67- 74 F8.5 mas PlxCor Parallax from Gaia DR3 (after zero-point
correction, see details in the paper
76- 83 F8.4 mas q_Dist Zero-point corrected parallax divided by its
standard error (1)
85- 93 F9.6 mag Gmag G-band mean magnitude from Gaia DR3
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Note (1): This can be used as a reference value to quantify the reliability of
the distance estimate Dist. Sources with q_Dist>5 are usually considered
high-quality distance estimates.
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Acknowledgements:
Eloisa Poggio, poggio.eloisa(at)gmail.com
References:
Vallenari et al., 2023A&A...674A...1G 2023A&A...674A...1G, Gaia Data Release 3:
Summary of the content and survey properties
Andrae et al., 2023ApJS..267....8A 2023ApJS..267....8A, Robust Data-driven Metallicities for
175 Million Stars from Gaia XP Spectra
Skowron et al., arXiv:2406.09113, The Milky Way as seen by Classical
Cepheids I: distances based on mid-infrared photometry
(End) Patricia Vannier [CDS] 05-May-2025