November 21, 2025The Astronomical JournalOpen Access

Toward a 2D H I Map of the Local Interstellar Medium

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Analysis of spatial interpolation reveals H I variations in the local interstellar medium, indicating the presence of the Local Bubble.

Mapped H I column density variations indicate the presence of the Local Bubble in the local interstellar medium.
Sky averages show log 10 [ N (H I )/cm −2 ] increases from 17.9 to 18.6 across distance shells from 10 to 100 pc.
Utilizing spatial interpolation methods based on UV absorption spectroscopy toward 164 nearby stars.
These findings suggest improved spatial sampling is necessary for accurate interstellar medium assessments.

Youngblood et al. (2025) studied this question.

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