Results 81 to 90 of about 36,797 (212)

Applying the Velocity Gradient Technique in NGC 1333: Comparison with Dust Polarization Observations

The Astrophysical Journal
Magnetic fields ( B -fields) are ubiquitous in the interstellar medium (ISM), and they play an essential role in the formation of molecular clouds and subsequent star formation.
Archana Soam, Ka Ho Yuen, Ian Stephens, Chi Yan Law, Ka Wai Ho, Simon Coudé   +5 more
doaj   +1 more source

Astrophysical turbulence modeling

, 2011
The role of turbulence in various astrophysical settings is reviewed. Among the differences to laboratory and atmospheric turbulence we highlight the ubiquitous presence of magnetic fields that are generally produced and maintained by dynamo action.
Alexandrova O, Allende Prieto C, Antia H M, Asplund M, Axel Brandenburg, Bahcall J N, Bahcall J N, Bahcall J N, Ballot J, Barge P, Bate M R, Benevolenskaya E E, Beresnyak A, Berezinskii V S, Binney J, Boldyrev S, Boldyrev S, Boldyrev S, Boldyrev S, Bonnor W B, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A Kuroda T, Brown B P, Brummell N H, Brun A S, Brun A S, Brunt C M, Brunt C M, Busse F H, Cai K, Choudhuri A R, Crutcher R M, Crutcher R M, Davidson P A, de Avillez M A, De Villiers J-P, Del Sordo F Brandenburg A, Dolag K, Durisen R H, Frank J, Frisch U, Fryxell B, Galtier S, Gammie C F, Goldreich P, Green C A, Green C A, Haugen N E L, Hawley J F, Haxton W C, Hodgson L S, Hubbard A, Hubbard A Brandenburg A, Inaba S, Inutsuka S, Iroshnikov P S, Jappsen A-K, Johansen A Oishi J S Mac Low M-M Klahr H Henning T Youdin A, Kadomtsev B B, Kitchatinov L L, Kleeorin N, Korpi M J, Krause F, Kritsuk A G, Kritsuk A G, Kritsuk A G, Kritsuk A G, Kritsuk A G, Krolik J H, Krumholz M R, Krumholz M R, Käpylä P J Korpi M J, Küker M, Larson R B, Larson R B, Lighthill M J, Lithwick Y, Lithwick Y, Mac Low M-M, Machida M, Machida M, Miesch M S, Miesch M S, Mihalas D, Mitra D, Mitra D, Moffatt H K, Nordlund Å, O'Shea B W, Padoan P, Padoan P, Padoan P, Padoan P, Padoan P, Padoan P Nordlund Å, Pan L, Parker E N, Perez J C, Ponty Y, Pouquet A Baerenzung J Pietarila Graham J Mininni P Politano H Ponty Y, Pulkkinen P, Rempel M, Rempel M, Richard O, Richtmyer R D, Rieutord M, Roettiger K, Roettiger K, Rogers T M, Ruediger G, Ruzmaikin A, Schekochihin A A, Schekochihin A A, Schekochihin A A, Shakura N I, Shore S N, Smith C W, Solanki S K, Spiegel E A, Stefani F, Stein R F, Stein R F, Steinmetz M, Stone J M, Subramanian K, Troland T H, Truelove J K, Tuominen I, Turner N J, Vishniac E T, Vishniac E T, Vázquez-Semadeni E, Wik D R, Wyngaard J C, Yusef-Zadeh F, Åke Nordlund   +143 more
core   +1 more source

Slope of Magnetic Field–Density Relation as an Indicator of Magnetic Dominance

The Astrophysical Journal
The electromagnetic field is a fundamental force in nature that regulates the formation of stars in the Universe. Despite decades of efforts, a reliable assessment of the importance of the magnetic fields in star formation relations remains missing.
Mengke Zhao, Guang-Xing Li, Keping Qiu
doaj   +1 more source

Interstellar Polarization Survey. V. Galactic Magnetic Field Tomography of the Spiral Arms Using Optical and Near-infrared Starlight Polarization

The Astronomical Journal
Interstellar linear polarization occurs when starlight passes through elongated dust grains aligned by interstellar magnetic fields. The observed polarization can come from different dust structures along the line of sight (LOS).
Y. Angarita, M. J. F. Versteeg, M. Haverkorn, V. Pelgrims, C. V. Rodrigues, A. M. Magalhães, R. Santos-Lima, Koji S. Kawabata   +7 more
doaj   +1 more source

The Origin of Filamentary Star Forming Clouds in Magnetised Galaxies

, 2018
Observations show that galaxies and their interstellar media are pervaded by strong magnetic fields with energies in the diffuse component being at least comparable to the thermal and even as large or larger than the turbulent energy.
Banerjee, Robi, Körtgen, Bastian, Pudritz, Ralph E., Schmidt, Wolfram   +3 more
core   +1 more source

Sub-Alfvénic Turbulence: Magnetic-to-kinetic Energy Ratio, Modification of Weak Cascade, and Implications for Magnetic Field Strength Measurements

The Astrophysical Journal
We study the properties of sub-Alfvénic magnetohydrodynamic (MHD) turbulence, i.e., turbulence with Alfvén mach number M _A = V _L / V _A < 1, where V _L is the velocity at the injection scale and V _A is the Alfvén velocity.
A. Lazarian, Ka Wai Ho, Ka Ho Yuen, Ethan Vishniac   +3 more
doaj   +1 more source

Magnetic fields and cosmic rays in GRBs. A self-similar collisionless foreshock

, 2008
Cosmic rays accelerated by a shock form a streaming distribution of outgoing particles in the foreshock region. If the ambient fields are negligible compared to the shock and cosmic ray energetics, a stronger magnetic field can be generated in the shock ...
Diamond, Diamond, Ellison, Goodman, Katz, Keshet, Kirk, Li, Medvedev, Medvedev, Medvedev, Medvedev, Medvedev, Mikhail V. Medvedev, Milosavljevic, Olga V. Zakutnyaya, Pelletier, Sironi, Spitkovsky, Spitkovsky, Vladimirov, Zweibel   +21 more
core   +1 more source

Evidence of a Thick Heliopause Boundary Layer Resulting from Active Magnetic Reconnection with the Interstellar Medium

The Astrophysical Journal
Voyager 1 and 2 data from the vicinity of the heliopause and very local interstellar medium are reexamined to better understand the confounding lack of rotation in the magnetic field ( B -field) across the heliopause observed by both Voyagers, despite ...
Drew L. Turner, Adam Michael, Elena Provornikova, Marc Kornbleuth, Merav Opher, Stefan Eriksson, Benoit Lavraud, Parisa Mostafavi, Matthew E. Hill, Pontus Brandt, Ian J. Cohen, Joseph Westlake, John D. Richardson, Nathan A. Schwadron, David J. McComas   +14 more
doaj   +1 more source

Environments for Magnetic Field Amplification by Cosmic Rays

, 2009
We consider a recently discovered class of instabilities, driven by cosmic ray streaming, in a variety of environments. We show that although these instabilities have been discussed primarily in the context of supernova driven interstellar shocks, they ...
Achterberg, Blasi, Drury, Dunne, Ellen G. Zweibel, Fried, John E. Everett, Krall, Kulsrud, Kulsrud, Lagage, Medvedev, Niemiec, Ohira, Rees, Riquelme, Vladimirov, Zirakashvili, Zweibel, Zweibel   +19 more
core   +1 more source

Most-likely DCF Estimates of Magnetic Field Strength

The Astrophysical Journal
The Davis–Chandrasekhar–Fermi (DCF) method is widely used to evaluate magnetic fields in star-forming regions. Yet it remains unclear how well DCF equations estimate the mean plane-of-the-sky field strength in a map region. To address this question, five
Philip C. Myers, Ian W. Stephens, Simon Coudé   +2 more
doaj   +1 more source