JWST-ALMA study of a hub-filament system in the nascent phase

N. K. Bhadari; L. K. Dewangan; O. R. Jadhav; A. Hoque; L. E. Pirogov; P. F. Goldsmith; A. K. Maity; S. Sharma; A. Haj Ismail; T. Baug

doi:10.1051/0004-6361/202452189

JWST-ALMA study of a hub-filament system in the nascent phase

N. K. Bhadari
, L. K. Dewangan
, O. R. Jadhav
, A. Hoque
, L. E. Pirogov
, P. F. Goldsmith
, A. K. Maity
, S. Sharma
, A. Haj Ismail
, T. Baug

College of Humanities and Sciences

Physical Research Laboratory India
Indian Institute of Technology Gandhinagar
S N Bose National Centre for Basic Science
Institute of Applied Physics of the Russian Academy of Sciences
California Institute of Technology
Aryabhatta Research Institute of Observational Sciences

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

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 (V_g) and gravity (F_g) vectors. We examined the spatial distribution of the gas velocity and the H₂ column density. Results. A steep V_g of 5 km s⁻¹ pc⁻¹ and −7 km s⁻¹ pc⁻¹ toward either side of G11P1-hub and a decreasing V_g toward the hub identify G11P1-HFS as a small-scale HFS in its nascent phase. Additionally, the V_g and F_g 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.

Original language	English
Article number	L18
Journal	Astronomy and Astrophysics
Volume	694
DOIs	https://doi.org/10.1051/0004-6361/202452189
State	Published - 1 Feb 2025

Keywords

HII regions
ISM: clouds
ISM: kinematics and dynamics
ISM: structure
dust, extinction

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10.1051/0004-6361/202452189

Cite this

@article{c96edb03b5c548969c109601c7a666c3,

title = "JWST-ALMA study of a hub-filament system in the nascent phase",

abstract = "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.",

keywords = "HII regions, ISM: clouds, ISM: kinematics and dynamics, ISM: structure, dust, extinction",

author = "Bhadari, \{N. K.\} and Dewangan, \{L. K.\} and Jadhav, \{O. R.\} and A. Hoque and Pirogov, \{L. E.\} and Goldsmith, \{P. F.\} and Maity, \{A. K.\} and S. Sharma and Ismail, \{A. Haj\} and T. Baug",

note = "Publisher Copyright: {\textcopyright} The Authors 2025.",

year = "2025",

month = feb,

day = "1",

doi = "10.1051/0004-6361/202452189",

language = "English",

volume = "694",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - JWST-ALMA study of a hub-filament system in the nascent phase

AU - Bhadari, N. K.

AU - Dewangan, L. K.

AU - Jadhav, O. R.

AU - Hoque, A.

AU - Pirogov, L. E.

AU - Goldsmith, P. F.

AU - Maity, A. K.

AU - Sharma, S.

AU - Ismail, A. Haj

AU - Baug, T.

PY - 2025/2/1

Y1 - 2025/2/1

N2 - 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.

AB - 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.

KW - HII regions

KW - ISM: clouds

KW - ISM: kinematics and dynamics

KW - ISM: structure

KW - dust, extinction

UR - https://www.scopus.com/pages/publications/85218409243

U2 - 10.1051/0004-6361/202452189

DO - 10.1051/0004-6361/202452189

M3 - Article

AN - SCOPUS:85218409243

SN - 0004-6361

VL - 694

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L18

ER -

JWST-ALMA study of a hub-filament system in the nascent phase

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Keywords

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