منابع مشابه
Hi Clouds beyond the Galactic Disk
Recent observations in the 21cm line with the Green Bank Telescope have changed our view of the neutral interstellar medium (ISM) in several ways. The new data show that in the inner parts of the Milky Way the disk-halo interface is composed of many discrete HI clouds. The clouds lie in a layer more than one kpc thick and follow Galactic rotation. Their origin and evolution is unknown. In the o...
متن کاملHi in the galactic halo
We find solid evidence for diffuse Hi gas at substantial z heights in our Galaxy, with a velocity dispersion of σ = 60 km s −1 and a vertical projected column density of N Hi = 1.4 · 10 19 cm −2. This pervasive component of the emission spectrum could be identified in the Leiden/Dwingeloo 21-cm Survey (LDS) after increasing the accuracy further by correcting the observations for reflections fro...
متن کاملThe Vertical Distribution and Kinematics of HI and Mass Models of the Galactic Disk
We present full modelling of tangent point emission of HI as seen in the 21cm transition in the inner Galaxy. We measure the scale height and velocity dispersion of HI as a function of Galactic radius besides the rotation curve and the z-centroid of the atomic layer. The model used takes into account emission from a large path length along the line of sight, corresponding to an interval ( R) of...
متن کاملThe corotation gap in the Galactic HI distribution
We used the HI data from the LAB survey to map the ring-shaped gap in HI density which lies slightly outside the solar circle. Adopting R0= 7.5 kpc, we find and average radius of 8.3 kpc and an average gap width of 0.8 kpc. The characteristics of the HI gap correspond closely to the expected ones, as predicted by theory and by numerical simulations of the gas flow near the corotation resonance.
متن کاملKinematics of Galactic Disk
The method of constructing of rotation curve for our galactic disk is developed. Simple physical model shows that the velocity of the Sun around the center of the Galaxy must be less than currently accepted IAU value 220 km/s. Independently obtained result for neutral hydrogen (λ = 21.1 cm) confirms the previous statement. The values of the Sun’s velocity is about 110 km/s. As a consequence, th...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1979
ISSN: 0074-1809
DOI: 10.1017/s0074180900014194