On Turbulent Pressure Confinement of Ultracompact H [CSC]ii[/CSC] Regions
نویسندگان
چکیده
منابع مشابه
On Turbulent Pressure Confinement of Ultra-Compact HII Regions
It has been proposed recently that the small size and long lifetime of ultracompact (UC) HII regions could be due to pressure confinement if the thermal pressure of the ambient gas is higher than previous estimates. We point out that confinement by thermal pressure alone implies emission measures in excess of observed values. We show that turbulent pressure, inferred from observed non-thermal v...
متن کاملUltracompact H Ii Regions
RESUMEN Discutimos algunos resultados observacionales recientes sobre regiones H II ultracompactas. En particular, discutimos la emisión extendida de algunas regiones H II UC y el descubrimiento de una nueva clase, denominada regiones H II " hipercompactas ". Además, describimos la obtención de la estructura de densidad usando la técnica del análisis deí ındice espectral. ABSTRACT We discuss so...
متن کاملUNDERSTANDING SPATIAL AND SPECTRAL MORPHOLOGIES OF ULTRACOMPACT H ii REGIONS
The spatial morphology, spectral characteristics, and time variability of ultracompact H ii regions provide strong constraints on the process of massive star formation. We have performed simulations of the gravitational collapse of rotating molecular cloud cores, including treatments of the propagation of ionizing and non-ionizing radiation. We here present synthetic radio continuum observation...
متن کاملHigh - resolution imaging of ultracompact H II regions
We present the results of an extensive imaging campaign on the ultracompact Hii region G5.89-0.39 at nearand mid-infrared wavelengths. High-resolution data were taken in the H , K ′, and L bands using ESO’s adaptive optics system ADONIS. They are complemented by conventional narrowband images in Brγ and H2(1−0)S1 as well as by mid-infrared broadand narrow-band images. We also mapped the 1.3 mm ...
متن کاملStudies of Ultracompact HII Regions - I . Methanol
A survey of ultracompact (UC) HII regions has been carried out by searching for 6.669GHz methanol maser emission from a sample of 535 IRAS selected candidates. A total of 201 candidates exhibit methanol emission. These sources have been used, in conjunction with previously identiied UC HII regions, to provide a base for further studies of such regions. Estimates of distances have indicated that...
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: The Astrophysical Journal
سال: 1996
ISSN: 0004-637X
DOI: 10.1086/310401