Shocked gas layers surrounding the WR nebula NGC 2359
نویسندگان
چکیده
منابع مشابه
Shocked gas layers surrounding the WR nebula NGC 2359
NGC 2359 is a Wolf-Rayet (W-R) nebula partially bound by a rather dense and warm molecular cloud. We present the results derived from CO and 13 CO fully sampled maps of the molecular material with angular resolutions up to 12 ′′. We have detected three different velocity components, and determined their spatial distribution and physical properties. The kinematics, morphology, mass and density a...
متن کامل2 00 1 Shocked ammonia in the WR nebula NGC 2359
We report the detection of the (1,1) and (2,2) metastable lines of ammonia (NH3) in the molecular cloud associated with the Wolf–Rayet (WR) nebula NGC2359. Besides the CO and H2, this is the first molecule detected in the environs of a WR star. Width (∆V1/2 = 3km s ) and radial velocity (VLSR ∼ 54 km s ) indicate that the NH3 lines arises from the molecular cloud which is interacting with the W...
متن کاملGravitational Instability of Shocked Interstellar Gas Layers
In this paper we investigate gravitational instability of shocked gas layers using linear analysis. An unperturbed state is a self-gravitating isothermal layer which grows with time by the accretion of gas through shock fronts due to a cloud-cloud collision. Since the unperturbed state is not static, and cannot be described by a self-similar solution, we numerically solved the perturbation equa...
متن کاملPinwheel Nebula around WR 98a.
We present the first near-infrared images of the dusty Wolf-Rayet star WR 98a. Aperture-masking interferometry has been utilized to recover images at the diffraction limit of the Keck I telescope, less, similar50 mas at 2.2 µm. Multiepoch observations spanning about 1 yr have resolved the dust shell into a "pinwheel" nebula, the second example of a new class of dust shell first discovered aroun...
متن کاملOn the origin and excitation of the extended nebula surrounding NGC 1275
We use line-of-sight velocity information on the filamentary emission-line nebula of NGC 1275 to infer a dynamical model of the nebula’s flow through the surrounding intracluster gas. We detect outflowing gas and flow patterns that match simulations of buoyantly rising bubbles from which we deduce that some of the nebula filaments have been drawn out of NGC 1275. We find a radial gradient of th...
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: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031330