Query : 2023A&A...671A..54M

2023A&A...671A..54M - Astronomy and Astrophysics, volume 671A, 54 (2023/3-1)

Bayesian inference of three-dimensional gas maps II. Galactic HI.


Abstract (from CDS):

The 21 cm emission from atomic hydrogen (H I ) is one of the most important tracers of the structure and dynamics of the interstellar medium. Thanks to Galactic rotation, the line is Doppler shifted and, assuming a model for the velocity field, data from gas line surveys can be deprojected along the line of sight. However, given our vantage point in the Galaxy, such a reconstruction suffers from a number of ambiguities. Here, we argue that those can be cured by exploiting the spatial coherence of the gas density that is implied by the physical processes shaping it. We have adopted a Bayesian inference framework that allows reconstructing the three-dimensional map of H I and quantifying its uncertainty. We employ data from the HI4PI compilation to produce three-dimensional maps of Galactic H I. The reconstructed density shows structure on a variety of scales. In particular, some spurs and spiral arms can be identified with ease. We discuss the morphology of the surface mass density and the radial and vertical profiles.

Abstract Copyright: © The Authors 2023

Journal keyword(s): Galaxy: structure - ISM: kinematics and dynamics - ISM: atoms - methods: statistical

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
2 NAME Per Arm PoG 03 30 +45.0           ~ 1519 0
3 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 518 1
4 NAME Nor Arm PoG 16 00 -50.0           ~ 434 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
6 NAME Galactic Bar reg ~ ~           ~ 1224 0
7 NAME Sct-Cen PoG ~ ~           ~ 231 0
8 NAME Local Arm reg ~ ~           ~ 540 0

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