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We use magnetohydrodynamical simulations of converging flows to investigate the process of molecular cloud formation and evolution out of the magnetised ISM. Here, we investigate whether the observed subcritical HI clouds can become…

Astrophysics of Galaxies · Physics 2015-06-02 Bastian Körtgen , Robi Banerjee

Magnetic fields on a range of scales play a large role in the ecosystems of galaxies, both in the galactic disk and in the extended layers of gas away from the plane. Observing magnetic field strength, structure and orientation is complex,…

Astrophysics of Galaxies · Physics 2015-05-27 Marijke Haverkorn , Volker Heesen

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…

Astrophysics of Galaxies · Physics 2017-01-11 Marc-Antoine Miville-Deschênes , Norman Murray , Eve J. Lee

Polarization data from high mass star formation regions (W51 e2/e8, Orion BN/KL) are used to derive statistical properties of the plane of sky projected magnetic field. Structure function and auto-correlation function are calculated for…

Solar and Stellar Astrophysics · Physics 2015-05-19 Patrick M. Koch , Ya-Wen Tang , Paul T. P. Ho

We used CO (2-1) and CO (1-0) data cubes to identify molecular clouds and study their kinematics and dynamics in three nearby galaxies and the inner Milky Way. When observed at similar spatial and velocity resolutions, molecular clouds in…

Astrophysics of Galaxies · Physics 2025-11-03 J. W. Zhou , Sami Dib

We examine the effects of self-gravity and magnetic fields on supersonic turbulence in isothermal molecular clouds with high resolution simulations and adaptive mesh refinement. These simulations use large root grids (512^3) to capture…

Solar and Stellar Astrophysics · Physics 2015-06-04 David Collins , Alexei G. Kritsuk , Paolo Padoan , Hui Li , Hao Xu , Sergey D. Ustyugov , Michael L. Norman

Describing how the properties of the interstellar medium combine across size-scales is crucial for understanding star formation scaling laws and connecting Galactic and extragalactic data of molecular clouds. We describe how the statistical…

Astrophysics of Galaxies · Physics 2021-09-15 Andri Spilker , Jouni Kainulainen , Jan Orkisz

High-Velocity Clouds (HVCs) are believed to be an important source of gas accretion for star formation in the Milky Way. Earlier numerical studies have found that the Galactic magnetic field and radiative cooling strongly affects accretion.…

Astrophysics of Galaxies · Physics 2021-12-08 Asger Grønnow , Thor Tepper-García , Joss Bland-Hawthorn , Filippo Fraternali

Using a high-resolution simulation of a dwarf galaxy, we quantify the energetic importance of magnetic fields within the different phases of its interstellar medium (ISM) on parsec scales. We show that, whilst overall the magnetic field is…

Astrophysics of Galaxies · Physics 2025-12-05 Ryan McGuiness , Rowan J. Smith , David Whitworth

We investigate the alignment mechanism between the magnetic field and interstellar clouds formed by the collision of warm atomic gas. We find that the magnetic field, initially oriented parallel to the flow, is perturbed by a fast MHD…

Astrophysics of Galaxies · Physics 2025-02-26 Guido Granda-Muñoz , Enrique Vázquez-Semadeni , Gilberto C. Gómez

The sample of 566 molecular clouds identified in the CO(2--1) IRAM survey covering the disk of M~33 is explored in detail.The clouds were found using CPROPS and were subsequently catalogued in terms of their star-forming properties as…

Astrophysics of Galaxies · Physics 2018-05-02 Jonathan Braine , Erik Rosolowsky , Pierre Gratier , Edvige Corbelli , Karl Schuster

We present the POL-2 850 $\mu$m linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations (BISTRO) survey at the James Clerk Maxwell Telescope. We find a…

Astrophysics of Galaxies · Physics 2019-05-31 Simon Coudé , Pierre Bastien , Martin Houde , Sarah Sadavoy , Rachel Friesen , James Di Francesco , Doug Johnstone , Steve Mairs , Tetsuo Hasegawa , Woojin Kwon , Shih-Ping Lai , Keping Qiu , Derek Ward-Thompson , David Berry , Michael Chun-Yuan Chen , Jason Fiege , Erica Franzmann , Jennifer Hatchell , Kevin Lacaille , Brenda C. Matthews , Gerald H. Moriarty-Schieven , Andy Pon , Philippe André , Doris Arzoumanian , Yusuke Aso , Do-Young Byun , Eswaraiah Chakali , Huei-Ru Chen , Wen Ping Chen , Tao-Chung Ching , Jungyeon Cho , Minho Choi , Antonio Chrysostomou , Eun Jung Chung , Yasuo Doi , Emily Drabek-Maunder , C. Darren Dowell , Stewart P. S. Eyres , Sam Falle , Per Friberg , Gary Fuller , Ray S. Furuya , Tim Gledhill , Sarah F. Graves , Jane S. Greaves , Matt J. Griffin , Qilao Gu , Saeko S. Hayashi , Thiem Hoang , Wayne Holland , Tsuyoshi Inoue , Shu-ichiro Inutsuka , Kazunari Iwasaki , Il-Gyo Jeong , Yoshihiro Kanamori , Akimasa Kataoka , Ji-hyun Kang , Miju Kang , Sung-ju Kang , Koji S. Kawabata , Francisca Kemper , Gwanjeong Kim , Jongsoo Kim , Kee-Tae Kim , Kyoung Hee Kim , Mi-Ryang Kim , Shinyoung Kim , Jason M. Kirk , Masato I. N. Kobayashi , Patrick M. Koch , Jungmi Kwon , Jeong-Eun Lee , Chang Won Lee , Sang-Sung Lee , Dalei Li , Di Li , Hua-bai Li , Hong-Li Liu , Junhao Liu , Sheng-Yuan Liu , Tie Liu , Sven van Loo , A-Ran Lyo , Masafumi Matsumura , Tetsuya Nagata , Fumitaka Nakamura , Hiroyuki Nakanishi , Nagayoshi Ohashi , Takashi Onaka , Harriet Parsons , Kate Pattle , Nicolas Peretto , Tae-Soo Pyo , Lei Qian , Ramprasad Rao , Mark G. Rawlings , Brendan Retter , John Richer , Andrew Rigby , Jean-François Robitaille , Hiro Saito , Giorgio Savini , Anna M. M. Scaife , Masumichi Seta , Hiroko Shinnaga , Archana Soam , Motohide Tamura , Ya-Wen Tang , Kohji Tomisaka , Yusuke Tsukamoto , Hongchi Wang , Jia-Wei Wang , Anthony P. Whitworth , Hsi-Wei Yen , Hyunju Yoo , Jinghua Yuan , Tetsuya Zenko , Chuan-Peng Zhang , Guoyin Zhang , Jianjun Zhou , Lei Zhu

We make the hypothesis that molecular cloud fragments are triaxial bodies with a large scale magnetic field oriented along the short axis. While consistent with theoretical expectations, this idea is supported by magnetic field strength…

Astrophysics · Physics 2009-10-31 Shantanu Basu

New visible polarization data combined with existing IR and FIR polarization data are used to study how the magnetic field threading the filamentary molecular cloud GF 9 connects to larger structures in its general environment. We find that…

Astrophysics · Physics 2008-11-26 F. Poidevin , P. Bastien

We generalize the classic Bonnor-Ebert stability analysis of pressure-truncated, self-gravitating gas spheres, to include clouds with arbitrary equations of state. A virial-theorem analysis is also used to incorporate mean magnetic fields…

Astrophysics · Physics 2009-10-28 Dean E. McLaughlin , Ralph E. Pudritz

Most of the baryonic matter in the Universe is permeated by magnetic fields which affect many, if not most, of astrophysical phenomena both, in compact sources and in diffuse gas. Recent years have been marked by a worldwide surge of…

Cosmology and Nongalactic Astrophysics · Physics 2010-03-23 Elisabete M. de Gouveia Dal Pino

Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the Velocity Gradient Technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O (1-0) emission lines…

The magnetohydrodynamic evolution of a dense spherical cloud as it interacts with a strong planar shock is studied, as a model for shock interactions with density inhomogeneities in the interstellar medium. The cloud is assumed to be small…

Astrophysics · Physics 2009-04-13 Min-Su Shin , James M. Stone , Gregory F. Snyder

Pulsars can act as an excellent probe of the Milky Way magnetic field. The average strength of the Galactic magnetic field component parallel to the line of sight can be estimated as $\langle B_\parallel \rangle = 1.232 \,…

Astrophysics of Galaxies · Physics 2021-01-27 Amit Seta , Christoph Federrath

We present the results of a new survey of 23 molecular clouds for the Zeeman effect in OH undertaken with the ATNF Parkes 64-m radio telescope and the NRAO Green Bank 43-m radio telescope. The Zeeman effect was clearly detected in the cloud…

Astrophysics · Physics 2009-11-06 Tyler L. Bourke , Philip C. Myers , Garry Robinson , A. R. Hyland