Results 61 to 70 of about 4,621,719 (221)
THE LINK BETWEEN TURBULENCE, MAGNETIC FIELDS, FILAMENTS, AND STAR FORMATION IN THE CENTRAL MOLECULAR ZONE CLOUD G0.253+0.016 [PDF]
, 2016 Star formation is primarily controlled by the interplay between gravity, turbulence, and magnetic fields. However, the turbulence and magnetic fields in molecular clouds near the Galactic center may differ substantially compared to spiral-arm clouds ...
C. Federrath +12 more
semanticscholar +1 more source
The energetics of molecular clouds. III - The S235 molecular cloud
The Astrophysical Journal, 1981 The molecular cloud associated with the S235 H II region has been studied by means of molecular lines and near-infrared observations. The cloud consists of two components, one of which partly surrounds the S235 H II region. The other component contains a dense, hot region of active star formation, marked by self-reversed CO profiles, compact H II ...
Frank P. Israel +7 more
openaire +2 more sources
Fast Molecular Cloud Destruction Requires Fast Cloud Formation
, 2017 A large fraction of the gas in the Galaxy is cold, dense, and molecular. If all this gas collapsed under the influence of gravity and formed stars in a local free-fall time, the star formation rate in the Galaxy would exceed that observed by more than an
Burkert, Andreas +2 more
core +1 more source
CO abundance variations in the Orion Molecular Cloud [PDF]
, 2013 Infrared stellar photometry from the Two Micron All Sky Survey (2MASS) and spectral line imaging observations of 12 CO and 13 CO J = 1-0 line emission from the Five College Radio Astronomy Observatory (FCRAO) 14m telescope are analysed to assess the ...
F. Ripple +4 more
semanticscholar +1 more source
Symposium - International Astronomical Union, 1992 Warm molecular gas is important in a large range of astronomical contexts. We discuss here determinations of the temperature and mass of warm material in protostellar disks and cores, photon dominated regions, and molecular material shocked by protostellar outflows. We then compare these results to heating and cooling models.
openaire +2 more sources
Molecular-Cloud Clusters and Chains [PDF]
Symposium - International Astronomical Union, 1985 We report some preliminary results from the Massachusetts - Stony Brook CO survey of the first galactic quadrant using the 14-meter millimeterwave telescope of the Five College Radio Astronomy Observatory. The survey contains approximately 50 000 observations spaced every 3 arcminutes in 1 and b between longitudes 0° and 90° and latitudes −1° and 1 ...
Sanders, D. B. +3 more
openaire +5 more sources
FILAMENTS IN SIMULATIONS OF MOLECULAR CLOUD FORMATION [PDF]
, 2013 We report on the filaments that develop self-consistently in a new numerical simulation of cloud formation by colliding flows. As in previous studies, the forming cloud begins to undergo gravitational collapse because it rapidly acquires a mass much ...
G. Gómez, E. Vázquez-Semadeni
semanticscholar +1 more source
Turbulence in Molecular Clouds [PDF]
, 1999 24 pages, 1 Latex file, 2 style files. To appear in ``Millimetric and Sub-Millimetric Astronomy. INAOE 1996 Summer School''
openaire +3 more sources
The approach to collapse of molecular clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 The dense molecular cloud cores that form stars, like other self-gravitating objects, undergo bulk oscillations. Just at the point of gravitational instability, their fundamental oscillation mode has zero frequency. We study, using perturbation theory, the evolution of a spherical cloud that possesses such a frozen mode.
Jeffrey J. Yen, Steven W. Stahler
openaire +3 more sources
Angular Momentum of the N2H+ Cores in the Orion A Cloud
, 2016 We have analyzed the angular momentum of the molecular cloud cores in the Orion A giant molecular cloud observed in the N2H+ J = 1-0 line with the Nobeyama 45 m radio telescope.
Luong, Quang Nguyen +5 more
core +1 more source