Multiple chemical tracers finally unveil the intricate NGC 1333 IRAS 4A outflow system. FAUST XVI
arxiv(2024)
Abstract
The exploration of outflows in protobinary systems presents a challenging yet
crucial endeavour, offering valuable insights into the dynamic interplay
between protostars and their evolution. In this study, we examine the
morphology and dynamics of jets and outflows within the IRAS 4A protobinary
system. This analysis is based on ALMA observations of SiO(5–4),
H_2CO(3_0,3–2_0,3), and HDCO(4_1,4–3_1,3) with a spatial
resolution of ∼150 au. Leveraging an astrochemical approach involving the
use of diverse tracers beyond traditional ones has enabled the identification
of novel features and a comprehensive understanding of the broader outflow
dynamics. Our analysis reveals the presence of two jets in the redshifted
emission, emanating from IRAS 4A1 and IRAS 4A2, respectively. Furthermore, we
identify four distinct outflows in the region for the first time, with each
protostar, 4A1 and 4A2, contributing to two of them. We characterise the
morphology and orientation of each outflow, challenging previous suggestions of
bends in their trajectories. The outflow cavities of IRAS 4A1 exhibit
extensions of 10” and 13” with position angles (PA) of 0^∘ and
-12^∘, respectively, while those of IRAS 4A2 are more extended,
spanning 18” and 25” with PAs of 29^∘ and 26^∘. We
propose that the misalignment of the cavities is due to a jet precession in
each protostar, a notion supported by the observation that the more extended
cavities of the same source exhibit lower velocities, indicating they may stem
from older ejection events.
MoreTranslated text
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined