| Issue |
A&A
Volume 694, February 2025
|
|
|---|---|---|
| Article Number | L18 | |
| Number of page(s) | 8 | |
| Section | Letters to the Editor | |
| DOI | https://doi.org/10.1051/0004-6361/202452189 | |
| Published online | 18 February 2025 | |
Letter to the Editor
JWST-ALMA study of a hub-filament system in the nascent phase
1
Astronomy & Astrophysics Division, Physical Research Laboratory, Ahmedabad 380009, India
2
Indian Institute of Technology, Gandhinagar 382355, India
3
Satyendra Nath Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700 106, India
4
Institute of Applied Physics of the Russian Academy of Sciences, 46 Ul’yanov Str., 603950 Nizhny Novgorod, Russia
5
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
6
Aryabhatta Research Institute of Observational SciencES (ARIES), Manora Peak, Nainital 263001, India
7
College of Humanities and Sciences, Ajman University, Ajman PO Box 346, United Arab Emirates
⋆⋆ Corresponding author; bhadrinaval@gmail.com
Received:
10
September
2024
Accepted:
30
December
2024
Context. Star clusters, including high-mass stars, form within hub-filament systems (HFSs). Observations of HFSs that remain unaffected by feedback from embedded stars are rare yet crucial for understanding the mass inflow process in high-mass star formation. Using the JWST NIRCAM images, a recent study reported that the high-mass protostar G11P1 is embedded in a candidate HFS (G11P1-HFS; < 0.6 pc).
Aims. Utilizing ALMA N2H+(1–0) data, we confirm the presence of G11P1-HFS and study the dense gas kinematics.
Methods. We analyzed the position–position–velocity (PPV) map and estimated on-sky velocity gradient (Vg) and gravity (ℱg) vectors. We examined the spatial distribution of the gas velocity and the H2 column density.
Results. A steep Vg of 5 km s−1 pc−1 and −7 km s−1 pc−1 toward either side of G11P1-hub and a decreasing Vg toward the hub identify G11P1-HFS as a small-scale HFS in its nascent phase. Additionally, the Vg and ℱg align along the filaments, indicating gravity-driven flows.
Conclusions. This work highlights the wiggled funnel-shaped morphology of an HFS in PPV space and suggests the importance of sub-filaments or transverse gas flows in mass transportation to the hub.
Key words: ISM: clouds / dust / extinction / HII regions / ISM: kinematics and dynamics / ISM: structure
© 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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