NGC 2024: excitation of the dense cores
نویسندگان
چکیده
منابع مشابه
The magnetic field in the NGC 2024 FIR 5 dense core
We used the Submillimeter Array (SMA) to observe the thermal polarized dust emission from the protostellar source NGC 2024 FIR 5. The polarized emission outlines a partial hourglass morphology for the plane-ofsky component of the core magnetic field. Our data are consistent with previous BIMA maps, and the overall magnetic field geometries obtained with both instruments are similar. We resolve ...
متن کاملThe peculiar circumstellar environment of NGC 2024 - IRS 2
We re-examine the nature of NGC 2024 IRS2 in light of the recent discovery of the late O-type star, IRS2b, located 5′′ from IRS2. Using L-band spectroscopy, we set a lower limit of AV = 27.0 mag on the visual extinction towards IRS2. Arguments based on the nature of the circumstellar material, favor an AV of 31.5 mag. IRS2 is associated with the UCH region G206.543–16.347 and the infrared sou...
متن کاملProtoplanetary Disk Masses in the Young Ngc 2024 Cluster
We present the results from a Submillimeter Array survey of the 887 μm continuum emission from the protoplanetary disks around 95 young stars in the young cluster NGC 2024. Emission was detected from 22 infrared sources, with flux densities from ∼5 to 330 mJy; upper limits (at 3σ) for the other 73 sources range from 3 to 24 mJy. For standard assumptions, the corresponding disk masses range from...
متن کاملDense “ cores ” in Taurus
The interstellar medium is highly dynamic and turbulent. However, little or no attention has been paid in the literature to the implications that this fact has on the validity of at least six common assumptions on the virial theorem (VT), which are as follows. (i) The only role of turbulent motions within a cloud is to provide support against collapse; (ii) the surface terms are negligible comp...
متن کاملCoherent Dense Cores
In a study of the velocity dispersion of molecular gas in maps of four dense cores, we Ðnd that : 3 (1) within the interiors of dense cores, the line widths are roughly constant at a value slightly but signiÐcantly higher than a purely thermal line width ; and (2) at the edges of the maps of the dense cores, it appears that the line width starts to increase. We suggest that these dense cores ar...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1992
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/256.3.369