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We have discovered an energetic high-velocity compact cloud CO$-$0.31+0.11 in the central molecular zone of our Galaxy. CO$-$0.31+0.11 is located at a projected distance of $\sim 45$ pc from the Galactic nucleus Sgr A$^*$. It is…

New 13CO data from the BU-FCRAO Milky Way Galactic Ring Survey (GRS) are analyzed to understand the shape and internal motions of molecular clouds. For a sample of more than five hundred molecular clouds, we find that they are…

天体物理学 · 物理学 2009-11-13 Jin Koda , Tsuyoshi Sawada , Tetsuo Hasegawa , Nick Scoville

We present the first observations of H$^{13}$CN$(1-0)$, H$^{13}$CO$^+(1-0)$ and SiO$(2-1)$ in NGC\,6240, obtained with the IRAM PdBI. Combining a Markov Chain Monte Carlo (MCMC) code with Large Velocity Gradient (LVG) modelling, and with…

星系天体物理 · 物理学 2015-12-23 R. Tunnard , T. R. Greve , S. Garcia-Burillo , J. Graciá Carpio , A. Fuente , L. Tacconi , R. Neri , A. Usero

This study presents a catalog of 8107 molecular clouds that covers the entire Galactic plane and includes 98% of the $^{12}$CO emission observed within $b\pm5^\circ$. The catalog was produced using a hierarchical cluster identification…

星系天体物理 · 物理学 2017-01-11 Marc-Antoine Miville-Deschênes , Norman Murray , Eve J. Lee

Characterizing the spatial and velocity structure of molecular clouds is a first step towards a better understanding of interstellar turbulence and its link to star formation. We present observations and structure analysis results for a…

天体物理学 · 物理学 2007-05-23 K. Sun , C. Kramer , V. Ossenkopf , F. Bensch , J. Stutzki , M. Miller

We present results of wide-field $^{12}$CO ($J = 2 - 1$) and $^{13}$CO ($J = 2 - 1$) observations toward the Aquila Rift and Serpens molecular cloud complexes (25$^\circ < l < 33^\circ$ and $1^\circ < b < 6^\circ$) at an angular resolution…

星系天体物理 · 物理学 2017-03-22 Fumitaka Nakamura , Kazuhito Dobashi , Tomomi Shimoikura , Tomohiro Tanaka , Toshikazu Onishi

Outflows from young stellar objects have been identified as a possible source of turbulence in molecular clouds. To investigate the relationship between outflows, cloud dynamics and turbulence, we compare the kinematics of the molecular gas…

We present observations of 4.25 square degree area toward the North American and Pelican Nebulae in the $J = 1-0$ transitions of $^{12}$CO, $^{13}$CO, and C$^{18}$O. Three molecules show different emission area with their own distinct…

太阳与恒星天体物理 · 物理学 2015-06-18 Shaobo Zhang , Ye Xu , Ji Yang

Combining observations of multiple CO lines with radiative transfer modeling is a very powerful tool to investigate the physical properties of the molecular gas in galaxies. Using new observations as well as literature data, we provide the…

宇宙学与河外天体物理 · 物理学 2015-06-17 Selcuk Topal , Estelle Bayet , Martin Bureau , Timothy A. Davis , Wilfred Walsh

We present an expanded distance catalog for 1,710 molecular cloud structures identified in the Bolocam Galactic Plane Survey (BGPS) version 2, representing a nearly threefold increase over the previous BGPS distance catalog. We additionally…

We use the ~370 square degrees data from the MWISP CO survey to study the vertical distribution of the molecular clouds (MCs) toward the tangent points in the region of l=[16,52]deg and |b|<5.1deg. The molecular disk consists of two…

星系天体物理 · 物理学 2021-04-14 Yang Su , Ji Yang , Qing-Zeng Yan , Shaobo Zhang , Hongchi Wang , Yan Sun , Zhiwei Chen , Chen Wang , Xin Zhou , Xuepeng Chen , Zhibo Jiang , Min Wang

We present 12CO(1->0) observations of 45 giant molecular clouds in M33 made with the BIMA array. The observations have a linear resolution of 20 pc, sufficient to measure the sizes of most GMCs in the sample. We place upper limits on the…

天体物理学 · 物理学 2009-11-10 Erik Rosolowsky , Greg Engargiola , Richard Plambeck , Leo Blitz

We present the survey of $^{12}$CO/$^{13}$CO/C$^{18}$O (J=1-0) toward the California Molecular Cloud (CMC) within the region of 161.75$^{\circ} \leqslant l \leqslant$ 167.75$^{\circ}$,-9.5$^{\circ} \leqslant b \leqslant $-7.5$^{\circ}$,…

星系天体物理 · 物理学 2021-11-03 Weihua Guo , Xuepeng Chen , Jiancheng Feng , Li Sun , Chen Wang , Yang Su , Yan Sun , Yiping Ao , Shaobo Zhang , Xin Zhou , Lixia Yuan , Ji Yang

We study the properties of giant molecular clouds (GMCs) from a smoothed particle hydrodynamics simulation of a portion of a spiral galaxy, modelled at high resolution, with robust representations of the physics of the interstellar medium.…

星系天体物理 · 物理学 2016-03-31 A. Duarte-Cabral , C. L. Dobbs

We report the first uniform and systematic study of dust and molecular gas in nearby molecular clouds. We use surveys of dust extinction and emission to determine the opacity and map the distribution of the dust within a dozen local clouds…

星系天体物理 · 物理学 2022-05-25 John Arban Lewis , Charles J. Lada , Thomas Dame

We present the results of ALMA-ACA 7 m-array observations in $^{12}$CO($J=2-1$), $^{13}$CO($J=2-1$), and C$^{18}$O($J=2-1$) line emission toward the molecular-gas disk in the Local Group spiral galaxy M33 at an angular resolution of 7".31…

Kinematic information is crucial for understanding the evolution of complex systems, such as interstellar gas. Obtaining full 3D kinematic information is a crucial final step for modeling and interpretation. Molecular clouds are nurseries…

星系天体物理 · 物理学 2025-09-24 Ji-Xuan Zhou , Guang-Xing Li , Bing-Qiu Chen

Molecular clouds are the cold regions of the Milky Way where stars form. They are enriched by rather complex molecules. Many of these molecules are believed to be synthesized on the icy surfaces of the interstellar submicron-sized dust…

We run numerical simulations of molecular clouds (MCs), adopting properties similar to those found in the Central Molecular Zone (CMZ) of the Milky Way. For this, we employ the moving mesh code Arepo and perform simulations which account…

星系天体物理 · 物理学 2016-09-21 Erik Bertram , Simon C. O. Glover , Paul C. Clark , Sarah E. Ragan , Ralf S. Klessen

In this review, I discuss recent detailed studies of individual molecular clouds in M33 in higher rotational transitions of CO, 13CO, and the fine structure line of atomic carbon. These data reveal that the temperature and density of the…

天体物理学 · 物理学 2007-05-23 C. D. Wilson