Three Dimensional Distribution of Atomic Hydrogen in the Milky Way

TL;DR

This paper presents a new 3D model of atomic hydrogen distribution in the Milky Way, revealing spiral arms, warping, and flaring of the gas disk, based on 21cm survey data.

Contribution

It introduces a novel 3D distribution model of Galactic atomic hydrogen derived from LAB survey data, capturing key structural features.

Findings

Atomic hydrogen mass within 20 kpc is 4.3×10^9 solar masses.

Galactic plane warps outside the solar orbit.

Gas disk thickness flares outward.

Abstract

A new model for three dimensional distribution of atomic hydrogen gas in the Milky Way is derived using the 21cm LAB survey data. The global features of the gas distribution such as spiral arms are reproduced. The Galactic plane warps outside the solar orbit and the thickness of the gas disk flares outward the Galaxy. It is found that the mass of atomic hydrogen gas within a radius of 20 kpc is 4.3*10^9 M_Sun.