J/A+A/694/A307 Disk stream candidate members (Ratzenboeck+, 2025)
Toward the fabric of the Milky Way.
I. The density of disk streams from a local 2503 pc3 volume.
Ratzenboeck S., Alves J., Hunt E., Miret-Roig N., Meingast M., Moeller T.
<Astron. Astrophys. 694, A307 (2025)>
=2025A&A...694A.307R 2025A&A...694A.307R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, ages ; Optical
Keywords: methods: data analysis - methods: statistical -
open clusters and associations: general - solar neighborhood -
Galaxy: structure
Abstract:
We studied 12 disk streams found in a 2503pc3 volume in the solar
neighborhood, which we define as coeval and comoving stellar
structures with aspect ratios greater than 3:1. Using Gaia Data
Release 3 data and the advanced clustering algorithms SigMA and
Uncover, we identified and characterized these streams beyond the
search volume, doubling, on average, their known populations. We
estimate the number density of disk streams to be ∼820 objects/kpc3
(for |Z|<100pc), or surface densities of ∼160 objects/kpc^2%. These
estimates surpass N-body estimates by one to two orders of magnitude
and challenge the prevailing understanding of their destruction
mechanisms. Our analysis reveals that these 12 disk streams are
dynamically cold with 3D velocity dispersions between 2 and 5km/s,
exhibit narrow sequences in the Hertzsprung-Russell diagram, and are
highly elongated with average aspect ratios of 7:1, extending up to
several hundred parsecs. We find evidence suggesting that one of the
disk streams, currently embedded in the Scorpius-Centaurus
association, is experiencing disruption, likely due to the primordial
gas mass of the association.
Description:
The tables contain cluster (table 1) and source (table 2) level
information on the 12 recovered disk streams in the solar
neighborhood. The cluster level table contains information such as
names, age, length, and mass of identified disk streams. It
corresponds to Table 1 in the paper. The source level cluster provides
Gaia DR3 source identification numbers, group identifiers, and phase
space information for each identified source. The phase space
coordinates (XYZUVW) in both tables are defined within the
heliocentric Galactic Cartesian coordinate system where the X-axis
grows positive toward the Galactic center, the Y-axis grows positive
in direction of Galactic rotation, and the Z-axis grows positive
toward the Galactic north pole.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
clusters.dat 74 12 Cluster level information on the 12 recovered
disk streams in the solar neighborhood
(table 1)
sources.dat 215 4405 Source level information on the 12 recovered
disk streams in the solar neighborhood
(table F1)
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- SID [1/12] Membership label for each disk stream
4- 22 A19 --- Name Literature name
24- 26 I3 --- Size Number of identified sources per disk stream
28- 30 I3 Myr Age Isochronal age determined
32- 34 I3 pc Length Peak-to-peak length of disk streams
36- 39 F4.1 --- AR Aspect ratio of first to third principal
component axis determined in Galactic
cartesian coordinates
41- 43 I3 --- Mass Sum of source masses determined from
isochrone fit
45- 47 I3 --- SysMass System mass determined by fitting IMF to
individual source masses
49- 51 F3.1 km/s 3DVelDisp 3D velocity dispersion measured in Galactic
Cartesian velocity space
53- 57 F5.1 km/s U Disk stream bulk motion in U direction
59- 63 F5.1 km/s V Disk stream bulk motion in V direction
65- 70 F6.2 km/s W Disk stream bulk motion in W direction
72- 74 I3 --- S/N [0/200] Signal-to-noise ratio
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Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 source identification number
21- 22 I2 --- SID [1/12] Membership label
24- 42 A19 --- Name Literature name
44- 63 F20.16 deg RAdeg Rigth ascension (ICRS) at Ep=2016.0
65- 84 F20.16 deg DEdeg Declination (ICRS) at Ep=2016.0
86-106 F21.16 pc X X position
108-128 F21.16 pc Y Y position
130-150 F21.16 pc Z Z position
152-172 F21.16 km/s U ? U velocity component
174-194 F21.16 km/s V ? V velocity component
196-215 F20.16 km/s W ? W velocity component
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Acknowledgements:
Sebastian Ratzenboeck, sebastian.ratzenboeck(at)univie.ac.at
(End) Patricia Vannier [CDS] 11-Feb-2025