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Books > Science & Mathematics > Astronomy, space & time > Galaxies, clusters, intergalactic matter
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The Interstellar Disk-Halo Connection in Galaxies (Paperback, Softcover reprint of the original 1st ed. 1991)
Loot Price: R5,784
Discovery Miles 57 840
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The Interstellar Disk-Halo Connection in Galaxies (Paperback, Softcover reprint of the original 1st ed. 1991)
Series: International Astronomical Union Symposia, 144
Expected to ship within 10 - 15 working days
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Highly ionized atoms in the general interstellar gas of the
galactic disk were first detected through interstellar absorption
line observations of 0 VI with the Copernicus satellite (Rogerson
et al. 1973). Survey measurements by Jenkins (1978) of interstellar
0 VI absorption toward 72 stars demonstrated the general presence
of 0 VI in the interstellar medium of the galactic disk. This
researcIi. and parallel observational studies of the soft X-ra}'
background (Williamson et al. 1974; McCammon et al. 1983; Marshall
and ClarK 1984) provided direct evidence for the existence of hot
low density gas in the mterstellar medium of the galactic disk. The
extension of the aDsorption line studies to the distant gas of the
galactic halo required the launch of the International Ultraviolet
Explorer (IUE) satellite in 1978. The first measures of highly
ionized gas m the galactic halo were obtained with the IDE when it
was used to record high resolution spectra of bright stars in the
Large Magellanic Cloud (Savage and de Boer 1979). Those early
spectra revealed the presence of absorption by Si IV and C IV in
the galactic nalo and have been followed by a number of surveys
with IUE of nighly ionized gas in the galactic disk and halo
(Savage and de Boer 1981; Pettini and West 1982; Savage and Massa
1987). The study of UV emission from highly ionized gas in the halo
has progressed more slowly because of the intrinsic faintness of
the emission.
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