منابع مشابه
Hi 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 کاملHi 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 کاملInterstellar Laments and the Statistics of Galactic Hi
This paper presents a statistical explanation of lament formation in the galactic atomic hydrogen. We claim that even in the absence of dynamical factors the Gaussian eld corresponding to the measured values of the spectrum of random density should develop lamentary structure, the existence of which has long been claimed. Therefore this paper relates the observations of laments by Verschuur (19...
متن کاملGalactic Recycling: the Hi Ring around Ngc 1533
We report the discovery of a new Hi ring around the S0 galaxy NGC 1533. The ring orbits at a radius of 35 kpc, well outside the optical extent of the galaxy. We have conducted N-body/SPH numerical simulations to show this Hi ring could be the merger remnant of a tidally destroyed galaxy. We find no optical component associated with the Hi ring. However, observations hint at Hα emission associat...
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.
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 1997
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as97118