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2000ApJS..129..563S - Astrophys. J., Suppl. Ser., 129, 563-610 (2000/August-0)
The Hubble space telescope quasar absorption line key project. XV. Milky Way absorption lines.
SAVAGE B.D., WAKKER B., JANNUZI B.T., BAHCALL J.N., BERGERON J., BOKSENBERG A., HARTIG G.F., KIRHAKOS S., MURPHY E.M., SARGENT W.L.W., SCHNEIDER D.P., TURNSHEK D. and WOLFE A.M.
Abstract (from CDS):
The overall strength of the Mg II λλ2796 and 2803 absorption appears to be correlated with the presence of high-velocity gas along the line to sight. Velocity-resolved Mg II absorption associated with high-velocity gas in the Magellanic Stream is detected toward eight QSOs, including PKS 0003+15, PG 0043+039, PKS 0637-75, 3C 454.3, PKS 2251+11, PG 2302+029, PKS 2340-36, and PKS 2344+09. Velocity-resolved Mg II absorption toward 15 QSOs is not accompanied by the existence of associated H I emission. Interesting objects in this category include PKS 0232-04 (l=174°.5, b=-56°.2), which has a high-velocity cloud (HVC) at v~+270 km.s–1 detected in Mg II, and PG 1116+215 (l=223°.3,b=68°.2) with a HVC at +200 km.s–1 detected in Mg II, C II, Si IV, and possibly C IV. The HVC toward PKS 0232-04 is interesting because all known H I HVCs in this general region of the sky have negative velocity rather than positive velocity. For 15 QSOs known to lie in the direction of H I HVCs, the Mg II lines have extremely strong principal absorption components, suggesting the detection of blended low- and high-velocity absorption. These lines of sight imply the detection of Mg II absorption by the high-velocity gas in HVC complexes C and A, in the outer Galaxy warp, and in the Magellanic Stream, as well as toward three smaller clouds. There are 11 QSO sight lines with very strong Mg II absorption for which there is no evidence for high-velocity H I emission. However, six of these sight lines lie near known H I HVCs. There are 38 QSOs with weak Mg II principal absorption and no known H I HVCs. These objects provide information about the H I absorption characteristics of disk and halo gas well away from H I HVCs. The sky covering factor of high-velocity Mg II is large, with 41 and 71 QSO lines of sight showing either resolved high-velocity Mg II absorption or principal absorption that is so strong that blended low- and high-velocity Mg II absorption is suggested.
Abstract Copyright: ∼
Journal keyword(s): ISM: Clouds - Galaxies: Quasars: Absorption Lines - ultraviolet: interstellar - Galaxy: Halo
Simbad objects: 85
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