We present Nobeyama 45m telescope C18O, 13CO, and 12CO(1-0) mapping observations towards an interstellar filament in the Taurus molecular cloud. We investigate the gas velocity structure along the filament and in its surrounding parent cloud. The filament is detected in the optically thin C18O emission as a single velocity component, ~1pc long, ~0.06pc wide structure. The C18O emission traces dust column densities larger than ~5x10^21 cm-2. The line-of-sight (LOS) velocity fluctuates along the filament crest with an average amplitude of ~0.2 km/s. The 13CO and 12CO integrated intensity maps show spatially extended emission around the elongated filament. We identify three extended structures with LOS velocities redshifted and blueshifted with respect to the average velocity of the filament identified in C18O. Based on combined analyses of velocity integrated channel maps and intensity variations of the optically thick 12CO spectra on and off the filament, we propose a 3-dimensional structure of the cloud surrounding the filament. We further suggest a multi-interaction scenario where sheet-like extended structures interact, in space and time, with the filament and are responsible for its compression and/or disruption, playing an important role in the star formation history of the filament. We also identify, towards the same field, a very faint filament showing a velocity field compatible with the filament formation process proposed by Inoue et al. (2017), where a filament is formed due to convergence of a flow of matter generated by the bending of the ambient magnetic field structure induced by an interstellar shock compression.
FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
用45米野边山望远镜进行的FOREST无偏银河平面成像巡天(FUGIN)项目是使用安装在45米野边山望远镜上的新的多波束FOREST接收器的遗留项目之一。该项目旨在通过同时观测12 CO,13 CO和C18 O J=1-0线,同时研究银河系中扩散和致密分子气体的分布,运动学和物理性质。映射区域是银河系第一象限(10 d < l <50 d,|b| <1 d)和第三象限(198 d < l <236 d,|b| <1 d)的一部分,其中包括旋臂、棒结构和分子气环。这次巡天达到了迄今为止在CO J=1-0线的银河平面巡天中最高的角分辨率(~20”),这使得有可能发现比以前的巡天更远的密集团块。Fugin将为我们研究银河系星际介质(ISM)的物理学提供宝贵的数据集,特别是覆盖银河系尺度结构的星际气体到巨型分子云内部结构的演化,如小细丝/团块/核心。我们提出了一个概述的FUGIN项目,观测计划和初步结果,揭示了宽领域和详细的结构的分子云,如纠缠的细丝,在以前的调查中并不明显,和大规模的运动学的分子气体,如螺旋臂。
Nobeyama 45 m Mapping Observations toward Orion A. II. Classification of cloud structures and variation of the $^{13}$CO/C$^{18}$O abundance ratio due to far-UV Radiation
ALMA ACA and Nobeyama observations of two Orion cores in deuterated molecular lines
我们用ALMA ACA 7米阵列和Nobeyama 45米射电望远镜绘制了猎户座A云中的两个分子云核心。这些核心有明亮的N $_2$ D $^+$发射在单点观测与野边山45米射电望远镜,有相对较高的氘分数,被认为是接近恒星形成的开始。一个是恒星形成核心,另一个是无恒星核心。这些核心位于沿长丝观察到的N $_2$ H $^+$,并显示窄线宽0.41公里秒$^{-1}$和0.45公里秒$^{-1}$在N $_2$ D $^+$,分别与Nobeyama 45米望远镜。用ALMA ACA 7m阵列在连续谱中检测两个核心,并在条带6处检测分子谱线。无星核G211显示出由几个子核组成的团簇结构,这些子核又显示出化学差异。此外,G211中的子核心具有几乎纯热的内部运动。特别是没有恒星的次核心G211D,显示出一个与天鹅座P相反的轮廓,暗示着坠落运动。恒星形成核心G210显示了一个有趣的空间特征,两个N $_2$ D $^+$峰具有相似的强度和径向速度,相对于单个尘埃连续峰对称地定位。一种解释是两个N $_2$ D $^+$峰代表边缘上的伪盘。然而,CO流出叶不垂直于连接两个N $_2$ D $^+$峰的线。
FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN): Possible evidence of cloud-cloud collisions triggering high-mass star formation in the giant molecular cloud M16 (Eagle Nebula)
A CO detection in the off-plane region of the edge-on galaxy NGC 4565 with the Nobeyama 45-m telescope
Institute of Astronomy, Graduate School of Science, The University of Tokyo(东京大学大学院理学系研究科天文学研究所);Research Center for Physics and Mathematics, Osaka Electro-Communication University(大阪电波大学理数研究中心);Division of Liberal Arts, Kogakuin University(工学分部,工学院大学)
From inter-filamentary gas to filaments and hubs: gas flows in the Mon R2 hub-filament system
Institute for Advanced Study, Kyushu University(九州大学高等研究院);Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University(九州大学理学部地球行星科学系);Korea Astronomy and Space Science Institute (KASI)(韩国天文学与空间科学研究院);Kyushu Kyoritsu University(九州共立大学);Department of Physics, Graduate School of Science, Nagoya University(名古屋大学理学研究科物理学科);Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto(波尔图大学太空与天体物理研究所);Faculty of Education, Kagawa University(香川大学教育学部)
Observations of DNC and DCO$^+$ toward the $\int$-shaped Filament and Starless Cores in the Orion Molecular Clouds
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, National Institutes of Natural Sciences(日本国立天文台野边山无线电观测站,国立自然科学研究所);SOKENDAI (The Graduate University for Advanced Studies)(综合研究大学院大学);Department of Physics, Graduate School of Science, Osaka Metropolitan University(大阪公立大学理学研究科物理学系);Star and Planet Formation Laboratory, RIKEN(理化学研究所星与行星形成实验室);Graduate School of Informatics and Engineering, The University of Electro-Communications(电波大学信息工学与研究科);Faculty of Education, Kagawa University(香川大学教育学部);Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University(九州大学理学部地球惑星科学系)
CHILES VI: HI and H$α$ Observations for z < 0.1 Galaxies; Probing HI Spin Alignment with Filaments in the Cosmic Web
我们目前的中性氢(HI)和电离氢(H $α$)的观测10个星系的红移为0.1。HI观测来自COSMOS HI大型河外巡天(智利)的第一个纪元(178小时)。我们的样本是HI偏置的,由10个晚型星系组成,HI质量范围从$1.8\times10^{7}$ M $_{\odot}$到$1.1\times10^{10}$ M $_{\odot}$。我们发现,虽然大多数星系的形态和运动学的不规则性,他们一般遵循的标度关系中发现的较大的样本。我们发现,HI和H $α$速度达到旋转曲线的平坦部分。我们确定的大尺度结构在附近的智利体积使用DisPerSE与光谱目录从SDSS。我们探索的气体性质的星系作为一个功能的位置在宇宙网络。我们还比较了角动量矢量(自旋)的星系最近的宇宙网丝的方向。我们的研究结果表明,星系自旋往往与宇宙网细丝对齐,并显示出与自旋角对齐相关的过渡质量的暗示。
High-spectral-resolution Observations of the [S II] Emission-line Doublet in the Filamentary Nebula Surrounding NGC 1275
Université de Montréal(蒙特利尔大学);Centre de recherche en astrophysique du Québec (CRAQ)(魁北克天体物理研究中心);Dragonfly Focused Research Organization(Dragonfly专注研究机构);Leibniz-Institut für Astrophysik Potsdam(波茨坦莱布尼茨天体物理研究所);Columbia University(哥伦比亚大学);Center for Computational Astrophysics, Flatiron Institute(平顿研究所计算天体物理学中心);Michigan State University(密歇根州立大学);Durham University(杜伦大学);University of Cambridge(剑桥大学)
ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XI. From inflow to infall in hub-filament systems
我们研究了在一个大样本的146个活跃的原团簇中心丝系统的存在下,使用H $^{13}$ CO $^{+}$ J=1-0的分子线数据从ATOMS调查。我们发现,细丝是普遍存在于原星系团,和枢纽丝系统是非常常见的从致密的核心尺度($\sim$ 0.1 pc)到团块/云尺度($\sim$ 1-10 pc)。含中心暗条系统的原星系团比例随尘埃温度($T_d$)和团簇亮度质量比($L/M$)的增加而减小,表明随着原星系团的演化,来自H{ \sc ii}区的恒星反馈逐渐破坏中心暗条系统。沿着最长的暗条可以看到明显的速度梯度,平均速度梯度为8.71 km s $^{-1}$ pc $^{-1}$,中值速度梯度为5.54 km s $^{-1}$ pc $^{-1}$。我们发现,速度梯度是小的细丝长度大于$\sim$ 1~pc,可能暗示惯性流入的存在,虽然我们不能确定后者是由大尺度湍流或大尺度引力收缩。相比之下,低于$\sim$ 1 pc的速度梯度随着细丝长度的减小而急剧增加,这表明中心或核心的重力开始在小尺度上主导气体入口。我们认为,自相似的中心灯丝系统和在所有尺度上的附加吸积可能在高质量恒星的形成中起着关键作用。
B-fields And dust in interstelLar fiLAments using Dust POLarization (BALLAD-POL): III. Grain alignment and disruption mechanisms in G34.43+0.24 using polarization observations from JCMT/POL-2
B-fields And dust in interstelLar fiLAments using Dust POLarization (BALLAD-POL): IV. Grain alignment mechanisms in Cocoon Nebula (IC 5146) using polarization observations from JCMT/POL-2
An ultra wide-band, high-sensitivity Q-band receiver for single-dish telescopes, eQ: rest frequency determination of CCS ($J_N$ = $4_3$-$3_2$) and SO ($J_N$ = $1_0$-$0_1$), and high-redshift CO ($J$ = 1-0) detection