| Issue |
A&A
Volume 702, October 2025
|
|
|---|---|---|
| Article Number | L1 | |
| Number of page(s) | 7 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202556622 | |
| Published online | 26 September 2025 | |
Direct measurement of ISM proper motion with image registration
University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180 Vienna, Austria
⋆ Corresponding author: martin.piecka@univie.ac.at
Received:
28
July
2025
Accepted:
3
September
2025
To date, the quantification of the on-sky motion for interstellar clouds has relied on proxies such as young stellar objects (YSOs) and masers. We present the first direct measurement of an interstellar cloud proper motion using the VISTA Star Formation Atlas (VISIONS) multi-epoch infrared images of the Corona Australis star-forming region. Proper motions are extracted by tracking the morphology of extended structures in the cloud complex based on image registration techniques implemented in SimpleITK. Our determined values (μα* ∼ +15 mas yr−1, μδ ∼ −30 mas yr−1) are in good agreement with those obtained for YSOs and young stellar clusters in the region. This study demonstrates the potential of image registration for directly mapping the kinematics of nearby molecular clouds, opening a new window into the study of cloud dynamics.
Key words: ISM: clouds / ISM: kinematics and dynamics / ISM: structure / ISM: individual objects: Corona Australis
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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