Imaging data for B335 Outflow paper

Abstract of paper:
The isolated globule B335 contains a single, low luminosity Class 0 protostar associated with a bipolar16
nebula and outflow system seen nearly perpendicular to its axis. We observed the innermost regions of17
this outflow as part of JWST/NIRCam GTO program 1187, primarily intended for wide-field slitless18
spectroscopy of background stars behind the globule. We find a system of expanding shock fronts19
with kinematic ages of only a few decades emerging symmetrically from the position of the embedded20
protostar, which is not directly detected at NIRCam wavelengths. The innermost and youngest of the21
shock fronts studied here shows strong emission from CO and possibly CO2, in addition to some H222
emission. The next older shock front shows less CO and the third shock front shows only H2 emission23
in our data. This third and most distant of these inner shock fronts shows substantial evolution of its24
shape since it was last observed with high spatial resolution in 1996 with Keck/NIRC. This may be25
evidence of a faster internal shock catching up with a slower one and of the two shocks merging.

论文摘要：孤立球状体B335内存在一颗单一天体——低光度0级原恒星（Class 0 protostar），该原恒星与近乎垂直于其轴线的双极星云及外流系统相关联。本研究作为JWST/NIRCam 保证时间观测（Guaranteed Time Observer, GTO）项目1187的组成部分，对该外流的最内侧区域开展了观测，该项目的核心目标是对球状体后方的背景恒星开展宽视场无狭缝光谱观测。我们在嵌入原恒星的位置对称地探测到运动学年龄仅为数十年的扩张激波前沿系统，该原恒星无法在NIRCam波段被直接探测到。本研究分析的最内侧、最年轻的激波前沿，除少量氢气（H₂）发射信号外，还展现出一氧化碳（CO）乃至疑似二氧化碳（CO₂）的强发射特征。次一级的较老激波前沿的一氧化碳发射信号较弱，而第三级激波前沿在本次观测数据中仅表现出氢气发射特征。相较于1996年使用凯克望远镜/NIRC（Keck/NIRC）以高空间分辨率开展的观测，这第三级亦是距离最远的内侧激波前沿的外形已发生显著演化。这一现象或可作为更快的内部激波追上较慢激波、并发生两激波合并过程的观测证据。