Results 31 to 40 of about 14,604 (166)
Dense Molecular Clumps with Large Blue Asymmetries: Evidence for Collapse
The Astrophysical JournalAn analysis of the Millimetre Astronomy Legacy Team 90 GHz survey has produced a sample of 27 candidate dense molecular clumps with large collapse motions, as revealed by large “blue” asymmetrical line profiles of the optically thick HCO ^+ (1–0) line ...
James M. Jackson +12 more
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The Role of Magnetic Field in Molecular Cloud Formation and Evolution
Frontiers in Astronomy and Space Sciences, 2019 We review the role that magnetic field may have on the formation and evolution of molecular clouds. After a brief presentation and main assumptions leading to ideal MHD equations, their most important correction, namely the ion-neutral drift is described.
Patrick Hennebelle +2 more
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CO Structures with Narrow Lines in Nearby Quiescent Regions
The Astrophysical Journal LettersUsing CO data from Phase I of the Milky Way Imaging Scroll Painting survey, we present a systematic study of molecular structures with narrow lines.
Ruilin Xia +15 more
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UniverseIn this paper, we continue the study of the thermodynamics of fluid elements in isothermal turbulent self-gravitating systems, presented by molecular clouds. We build the model again on the hypothesis that, locally, the turbulent kinetic energy per fluid
Sava D. Donkov +2 more
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HCO+ in dark molecular clouds [PDF]
Serbian Astronomical Journal, 2007 Formyl ion is one of the most important molecules, and primary molecular ion to be found in molecular clouds. This paper reviews chemical pathways of formation and destruction of the molecule, as well as its use as a tool in the study of dark molecular ...
Nikolić S.
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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 +3 more sources
The Correlation Between Dust and Gas Contents in Molecular Clouds
The Astronomical JournalMolecular clouds are regions of dense gas and dust in space where new stars and planets are born. There is a strong correlation between the distribution of dust and molecular gas in molecular clouds.
Rui-Zhi Li +5 more
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Understanding the Kinetic Energy Deposition within Molecular Clouds
The Astrophysical Journal, 2023 According to the structures traced by ^13 CO spectral lines within ^12 CO molecular clouds (MCs), we investigate the contributions of their internal gas motions and relative motions to the total velocity dispersions of ^12 CO MCs. Our samples of 2851 ^12
Lixia Yuan +10 more
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Review of Zeeman Effect Observations of Regions of Star Formation
Frontiers in Astronomy and Space Sciences, 2019 The Zeeman effect is the only observational technique available to measure directly the strength of magnetic fields in regions of star formation. This chapter reviews the physics of the Zeeman effect and its practical use in both extended gas and in ...
Richard M. Crutcher, Athol J. Kemball
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Filaments in the Lupus molecular clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We have studied the filaments extracted from the column density maps of the nearby Lupus 1, 3, and 4 molecular clouds, derived from photometric maps observed with the Herschel satellite. Filaments in the Lupus clouds have quite low column densities, with a median value of $\sim$1.5$\times$10$^{21}$ cm$^{-2}$ and most have masses per unit length lower ...
Benedettini, M. +21 more
openaire +8 more sources