ATOMS: ALMA three-millimeter observations of massive star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ( 1500 M<SUB>⊙</SUB>) clump - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2023

ATOMS: ALMA three-millimeter observations of massive star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ( 1500 M) clump

Siju Zhang
  • Function : Author
Ke Wang
  • Function : Author
Annie Zavagno
Tie Liu
  • Function : Author
Hongli Liu
  • Function : Author
Mika Juvela
  • Function : Author
Anandmayee Tej
  • Function : Author
Amelia M. Stutz
  • Function : Author
Shanghuo Li
  • Function : Author
Leonardo Bronfman
  • Function : Author
Qizhou Zhang
  • Function : Author
Paul F. Goldsmith
  • Function : Author
Chang Won Lee
  • Function : Author
Enrique Vázquez-Semadeni
  • Function : Author
Ken'Ichi Tatematsu
  • Function : Author
Wenyu Jiao
  • Function : Author
Fengwei Xu
  • Function : Author
Chao Wang
  • Function : Author
Jian-Wen Zhou
  • Function : Author

Abstract

Whether ionization feedback triggers the formation of massive stars is highly debated. Using ALMA 3 mm observations with a spatial resolution of ~0.05 pc and a mass sensitivity of 1.1 $\rm M_\odot$ beam-1 at 20 K, we investigate the star formation and gas flow structures within the ionizing feedback-driven structure, a clump-scale massive (≳ 1500 $\rm M_\odot$) bright-rimmed cloud (BRC) associated with IRAS 18290-0924. This BRC is bound only if external compression from ionized gas is considered. A small-scale (≲ 1 pc) age sequence along the direction of ionizing radiation is revealed for the embedded cores and protostars, which suggests triggered star formation via radiation-driven implosion (RDI). Furthermore, filamentary gas structures converge towards the cores located in the BRC's center, indicating that these filaments are fueling mass towards cores. The local core-scale mass infall rate derived from H13CO+ J = 1 - 0 blue profile is of the same order of magnitude as the filamentary mass inflow rate, approximately 1 $\rm M_\odot$ kyr-1. A photodissociation region (PDR) covering the irradiated clump surface is detected in several molecules, such as CCH, HCO+, and CS whereas the spatial distribution stratification of these molecules is indistinct. CCH spectra of the PDR possibly indicate a photoevaporation flow leaving the clump surface with a projected velocity of ~2 km s-1. Our new observations show that RDI accompanied by a clump-fed process is operating in this massive BRC. Whether this combined process works in other massive BRCs is worth exploring with dedicated surveys.
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insu-03967850 , version 1 (12-07-2023)

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Siju Zhang, Ke Wang, Annie Zavagno, Tie Liu, Hongli Liu, et al.. ATOMS: ALMA three-millimeter observations of massive star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ( 1500 M) clump. Monthly Notices of the Royal Astronomical Society, 2023, ⟨10.1093/mnras/stad011⟩. ⟨insu-03967850⟩
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