منابع مشابه
Highly Ionized High Velocity Clouds
We have recently used the Hubble Space Telescope to study a pair of high velocity clouds in the direction of Mrk 509 that have unusual ionization properties. They exhibit strong C iv absorption with little or no low ion absorption or H i 21 cm emission. As the closest known analog to the outer diffuse halos of damped Lyα absorbers and the low N(H i) metal line absorption systems seen in the spe...
متن کاملIn Highly Ionized High-velocity Clouds
We present a Far-Ultraviolet Spectroscopic Explorer survey of highly ionized high-velocity clouds (HVCs) in 66 extragalactic sight lines with S/N1030 >8. We searched the spectra for high-velocity (100 < |vLSR| < 400km s ) O VI absorption and found a total of 63 absorbers, 16 with 21 cmemitting H I counterparts and 47 “highly ionized” absorbers without 21 cm emission. The highly ionized HVC popu...
متن کاملHighly - Ionized High - Velocity Gas In the Vicinity of the Galaxy
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 ([email protected] Department of Astronomy, University of Wisconsin, 475 N. Charter St., Madison, WI 53706 Current address: Observatorio Astrofisico di Arcetri, Largo E. Fermi 5, Florence, Italy Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, Bould...
متن کاملHighly Ionized High Velocity Clouds: Intergalactic Gas in the Local Group or Distant Gas in the Galactic Halo?
In the course of our studies of the gaseous halo surrounding the Milky Way, we have recently identified several high velocity (VLSR < -100 km s ) clouds in the directions of Mrk 509 and PKS 2155-304 that have unusual ionization properties. The clouds exhibit strong C IV absorption with little or no detectable low ion (C II, Si II) absorption or H I 21 cm emission down to very sensitive levels. ...
متن کاملThermodynamic properties of the ionized gas 3He
In this article, we have calculated some thermodynamic properties for a system consisting of singy ionized 3He atoms and their corresponding removed electrons by employing the second quantization method at finite temperature. To perform the calculations, we have considered the kinetic term, and Coulomb interaction between the particles in our Hamiltonian. The calculated properties are free ener...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1989
ISSN: 0074-1809
DOI: 10.1017/s0074180900187029