Galactic absorption lines measured from the IUE low dispersion spectra of active galaxies

Details Galactic absorption lines measured from the IUE low dispersion spectra of active galaxies Galactic absorption lines measured from the IUE low dispersion spectra of active galaxies

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..123w&link_type=abstract

In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 123-126 (SEE N85-20961 11-89)

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Active Galaxies, Galaxies, Halos, Iue, Magellanic Clouds, Ultraviolet Astronomy, Carbon, Gas Ionization, Line Spectra, Quasars

Scientific paper

Galactic absorption lines were detected and measured from the low dispersion spectra of 10 active galaxies. Four of these are at galactic latitudes greater than 60 deg and the remaining 6 are at latitudes between 20 and 60 deg and behind high velocity 21 cm clouds. In our galactic absorption line systems, while C II wavelength 1335 is commonly seen, C IV wavelength 1550 is detected with confidence only in high latitude objects and Fairall 9 which has a latitude close to 60 deg and lies in the general direction of the Magellanic Clouds. The C IV to C II ratio is about one for the high latitude objects; and lower for the low latitude objects. This is consistent with the picture that C IV and C II exist mostly in the halo and disk, respectively. In the quasar absorption line systems, C II is rarely seen while C IV is generally strong. This suggests that the halo of intervening galaxies are large compared to their disk. Therefore, the slight lines to high z QSOs frequently intercept the halo but rarely both the disk and halo of intervening galaxies.

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