منابع مشابه
Velocity Spectrum for Hi at High Latitudes
In this paper we present the results of the statistical analysis of high-latitude Hi turbulence in the Milky Way. We have observed Hi in the 21 cm line, obtained with the Arecibo L-Band Feed Array (ALFA) receiver at the Arecibo radio telescope. For recovering of velocity statistics we have used the Velocity Coordinate Spectrum (VCS) technique. In our analysis we have used direct fitting of the ...
متن کاملWesterbork HI observations of two High - Velocity Clouds
Westerbork HI synthesis observations are presented for the directions of the stars 4 Lac and HD 135485. Interstellar absorption lines at high velocities had been reported in the UV spectrum of 4 Lac, setting an upper limit of 1.2 kpc on the distance of the associated, small HI cloud (Bates et al. 1990, 1991). The Westerbork observations show that this cloud (l = 100o, b = −7o, vLSR = +100 km s−...
متن کاملInfrared Search for Young Stars in Hi High-velocity Clouds
We have searched the IRAS Point Source Catalog and HIRES maps for young stellar objects (YSOs) in the direction of five HI high-velocity clouds (HVCs). In agreement with optical searches in the halo, no evidence was found for extensive star-forming activity inside the high-latitude HVCs. Specifically, we have found no signs of star formation or YSOs in the direction of the A IV cloud or in the ...
متن کاملVelocity Modification of HI Power Spectrum
The distribution of atomic hydrogen in the galactic plane is usually mapped using the Doppler shift of 21 cm emission line and this causes the modification of the observed spectrum which is frequently referred to as velocity crowding effect. We calculate HI spectrum in the velocity space and derive the observed spectrum dependence on the statistics of velocity and density fields. We show that t...
متن کاملA High-Velocity Impact Simulation using SPH-Projection Method
In this paper, a new smoothed particle hydrodynamics (SPH) algorithm for simulation of elastic-plastic deformation of solids was proposed. The key point was that materials under highvelocity impact (HVI) behave like fluids. This led to propose a method which was similar to the socalled SPH-projection method, in which the momentum equations are solved as the governing equations. The method consi...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1979
ISSN: 0074-1809
DOI: 10.1017/s0074180900015059