منابع مشابه
Ammonia in Infrared Dark Clouds
Context. While low mass clouds have been relatively well studied, our picture of high-mass star formation remains unclear. Infrared Dark Clouds appear to be the long sought population of cold and dense aggregations with the potential of harbouring the earliest stages of massive star formation. Up to now there has been no systematic study on the temperature distribution, velocity fields, chemica...
متن کاملWidespread SiO and CH3OH emission in filamentary infrared dark clouds
Infrared dark clouds (IRDCs) are cold, dense regions of high (optical and infrared) extinction, believed to be the birthplace of high-mass stars and stellar clusters. The physical mechanisms leading to the formation of these IRDCs are not completely understood and it is thus important to study their molecular gas kinematics and chemical content to search for any signature of the IRDCs formation...
متن کاملTwo Massive, Low-luminosity Cores toward Infrared Dark Clouds
This article presents high-resolution interferometric mosaics in the 850μm waveband of two massive, quiescent infrared dark clouds. The two clouds were chosen based on their likelihood to represent environments preceding the formation of massive stars. The brightest compact sources detected in each cloud have masses ≈ 110M and ≈ 60M with radii < 0.1 pc, implying mean densities of 〈n〉 ≈ 10 cm−3 ...
متن کاملMagnetic Fields in High-mass Infrared Dark Clouds
High-mass Stars are cosmic engines known to dominate the energetics in the Milky Way and other galaxies. However, their formation is still not well understood. Massive, cold, dense clouds, often appearing as Infrared Dark Clouds (IRDCs), are the nurseries of massive stars. No measurements of magnetic fields in IRDCs in a state prior to the onset of high-mass star formation (HMSF) have previousl...
متن کاملInitial Conditions for Massive Star Birth – Infrared Dark Clouds
We summarize the properties of Infrared Dark Clouds, massive, dense, and cool aggregations of interstellar gas and dust that are found througout the Galaxy in projection against the strong mid-infrared background. We describe their distribution and give an overview of their physical properties and chemistry. These objects appear to be the progenitors of highmass stars and star cluster, but appe...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2016
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201526864