J/ApJ/937/114 Topography of the Young Galactic Disk (Alfaro+, 2022)
Topography of the Young Galactic Disk: Spatial and Kinematic Patterns of the
Clustered Star Formation in the Solar Neighborhood.
Alfaro E.J., Jimenez M., Sanchez-Gil M.C., Sanchez N., Gonzalez M.,
Maiz-Apellaniz J.
<Astrophys. J. 937, 114 (2022)>
=2022ApJ...937..114A 2022ApJ...937..114A (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Stellar distribution
Keywords: open star clusters - star formation - catalogs - surveys -
Milky Way disk - Milky Way dynamics
Abstract:
The accuracy in determining the spatial-kinematical parameters of open
clusters makes them ideal tracers of the Galactic structure. Young
open clusters (YOCs) are the main representative of the clustered star
formation mode, which identifies how most of the stars in the Galaxy
form. We apply the Kriging technique to a sample of Gaia YOCs within a
3.5 kpc radius around the Sun and log(age)≤7.5, age in years, to
obtain the Z(X,Y) and VZ(X,Y) maps. The previous work by Alfaro et al.
(1991ApJ...378..106A 1991ApJ...378..106A) showed that Kriging can provide reliable results
even with small data samples (N∼100). We approach the 3D spatial and
vertical velocity field structure of the Galactic disk defined by YOCs
and analyze the hierarchy of the stellar cluster formation, which
shows a rich hierarchical structure, displaying complexes embedded
within each other. We discuss the fundamental characteristics of the
methodology used to perform the mapping and point out the main results
obtained in phenomenological terms. Both the 3D spatial distribution
and the vertical velocity field reveal a complex disk structure with a
high degree of substructures. Their analysis provides clues about the
main physical mechanisms that shape the phase space of the clustered
star formation in this Galactic area. Warp, corrugations, and high
local deviations in Z and VZ, appear intimately connected in a single
but intricate scenario.
Description:
We present the 3D spatial and vertical velocity field structure of
the young Galactic disk provided by the Kriging technique using a
sample of young open clusters (YOCs) derived from Gaia DR2 data. The
YOCs cover an area of 3.5kpc around the Sun with log(age)≤7.5-years.
We provide the Kriging predictions of Z and Vz fields over a (X,Y) 2D
matrix.
Kriging uncertainty estimates are shown in columns 4 and 6. Current
reference: https://arxiv.org/pdf/2206.11313.pdf
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
matrices.dat 61 443572 Kriging matrices of Z and Vz fields
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Byte-by-byte Description of file: matrices.dat
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Bytes Format Units Label Explanations
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3- 9 F7.1 pc X Heliocentric X coordinate
13- 19 F7.1 pc Y Heliocentric Y coordinate
23- 31 F9.4 pc Z Kriging predicted Z coordinate
35- 41 F7.4 pc s_Z Kriging dispersion for Z
45- 52 F8.4 km/s Vz Kriging vertical velocity Vz
56- 61 F6.4 km/s s_Vz Kriging dispersion for Vz
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Acknowledgements:
Emilio Alfaro, emilio(at)iaa.es,
Manuel Jimenez, mjimenez(at)iaa.es
(End) Patricia Vannier [CDS] 24-Aug-2022