J/A+A/692/A255 LMC catalogue in Galactic Plane (Rezaei Kh.+, 2024)
3D structure of the Milky Way out to 10 kpc from the Sun.
Catalogue of large molecular clouds in the Galactic Plane.
Rezaei Kh.S., Beuther H., Benjamin R.A., Eilers A.-C., Henning T.,
Jimenez-Donaire M.J., Miville-Deschenes M.-A.
<Astron. Astrophys. 692, A255 (2024)>
=2024A&A...692A.255R 2024A&A...692A.255R (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Morphology
Keywords: ISM: clouds - dust, extinction - ISM: structure - Galaxy: disk -
Galaxy: structure - galaxies: star formation
Abstract:
Understanding the 3D structure of the Milky Way is a crucial step in
deriving properties of the star-forming regions, as well as the
Galaxy as a whole. We present a novel 3D map of the Milky Way plane
that extends to 10kpc distance from the Sun. We leverage the wealth
of information in the near-infrared dataset of the Sloan Digital Sky
Survey's Apache Point Observatory Galactic Evolution Experiment
(APOGEE) and combine that with our state-of-the-art 3D mapping
technique using Bayesian statistics and the Gaussian process to
provide a large-scale 3D map of the dust in the Milky Way. Our map
stretches across 10kpc along both the X and Y axes, and 750pc in the
Z direction, perpendicular to the Galactic plane. Our results reveal
multi-scale over-densities as well as large cavities in the Galactic
plane and shed new light on the Galactic structure and spiral arms. We
also provide a catalogue of large molecular clouds identified by our
map with accurate distance and volume density estimates. Utilising
volume densities derived from this map, we explore mass distribution
across various galactocentric radii. A general decline towards the
outer Galaxy is observed, followed by local peaks, some aligning with
established features such as the molecular ring and segments of the
spiral arms. Moreover, this work explores extragalactic observational
effects on derived properties of molecular clouds by demonstrating the
potential biases arising from column density measurements in inferring
properties of these regions, and opens exciting avenues for further
exploration and analysis, offering a deeper perspective on the complex
processes that shape our galaxy and beyond.
Description:
We present a novel 3D map of the Milky Way plane that extends to
10 kpc distance from the Sun. We leverage the wealth of information in the
near-infrared dataset of APOGEE and combine that with our state-of-the-art
3D mapping technique using Bayesian statistics and the Gaussian process to
provide a large-scale 3D map of the dust in the Milky Way. We also provide
a catalogue of large molecular clouds identified by our map with accurate
distance and volume density estimates.
This dataset contains two files:
One is a catalogue of large molecular clouds in the Galactic plane.
Each entry includes the clouds center coordinates, its distance from
the Sun, size, density, and known associations with Galactic
structures. The second one is the 3D distribution of density in the
Milky Way Galaxy out to 10 kpc from the Sun. It provides Galactic
coordinates, density values, and derived Cartesian coordinates (X, Y).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 84 Catalogue of large molecular clouds
finalmap.dat 52 196503 3D structure of dust in the Milky Way
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID Cloud identifier
4- 9 F6.2 deg GLON Galactic longitude of the clouds center
11- 16 F6.2 deg GLAT Galactic latitude of the clouds center
18- 22 F5.2 kpc dcentre Distance to the clouds center
24- 27 F4.2 kpc e_dcentre Uncertainty in dcentre (1 sigma)
29- 31 I3 pc meanradius ?=- Mean radius of the molecular cloud
33- 38 F6.2 cm-3 meandensity Mean particle density in the cloud
40- 44 F5.2 cm-3 e_meandensity ?=- Standard deviation of the density
46- 65 A20 --- arm/association Known Galactic arm or association
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Byte-by-byte Description of file: finalmap.dat
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Bytes Format Units Label Explanations
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1- 6 F6.2 deg GLON Galactic longitude
8- 13 F6.2 deg GLAT Galactic latitude
15- 22 F8.2 pc Distance Distance from the Sun
24- 29 F6.2 cm-3 Density Particle density
31- 35 F5.2 cm-3 s_Density Standard deviation of Density
37- 45 F9.2 pc GalX Galactic X coordinate
47- 52 I6 pc GalY Galactic Y coordinate
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Acknowledgements:
Sara Rezaei Kh., s.rezaei.kh(at)gmail.com
(End) Patricia Vannier [CDS] 11-Dec-2024