What question did this study set out to answer?

The aim is to create a three-dimensional map of local atomic hydrogen (H i) within 1.25 kpc of the Sun, integrating emission data for enhanced structural accuracy.

July 11, 2026Monthly Notices of the Royal Astronomical SocietyOpen Access

Milky Way Atlas: A radial-velocity-resolved, three-dimensional map of H i within 1.25 kpc

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The aim is to create a three-dimensional map of local atomic hydrogen (H i) within 1.25 kpc of the Sun, integrating emission data for enhanced structural accuracy.
Combined HI4PI full-sky survey with a 3D dust map using Information Field Theory.
Reconstructed local H i density, radial velocity field, and effective line width by assessing dust and H i structure.
Synthetic data tests validated the method's effectiveness against contamination from distant emissions.
The map showed a smoother and more diffuse local H i distribution compared to dust.
Observed a declining H i-to-dust ratio with increasing dust column densities, indicating an atomic-to-molecular transition.
Velocity field analysis matched both large-scale Galactic rotation and local non-circular velocities, confirmed by independent comparisons with maser data.

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Implication

Velocity-resolved map reveals local atomic hydrogen distribution and velocity in the interstellar medium, suggesting new insights into Galactic dynamics.

Cite This Study

McCallum et al. (2026) studied this question.

synapsesocial.com/papers/6a51df22c18d7f28ca500734 https://doi.org/10.1093/mnras/stag1303

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Implication

Velocity-resolved map reveals local atomic hydrogen distribution and velocity in the interstellar medium, suggesting new insights into Galactic dynamics.

Milky Way Atlas: A radial-velocity-resolved, three-dimensional map of H i within 1.25 kpc

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Discussion

Implication

Cite This Study

Milky Way Atlas: A radial-velocity-resolved, three-dimensional map of H i within 1.25 kpc

Key Points

Discussion

Implication

Cite This Study

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