TY - JOUR
T1 - The C IV absorption-Mg II kinematics connection in 〉z〈 ∼ 0.7 galaxies
AU - Churchill, Christopher W.
AU - Mellon, Richard R.
AU - Charlton, Jane C.
AU - Jannuzi, Buell T.
AU - Kirhakos, Sofia
AU - Steidel, Charles C.
AU - Schneider, Donald P.
N1 - Funding Information:
5IRAF is distributed by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract to the NSF.
Funding Information:
Support for this work was provided by NSF grant AST 96-17185 and NASA grants NAG5-6399 and AR-07983.01-96A, the latter from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. B. T. J. acknowledges support from NOAO, which is operated by AURA, Inc., under cooperative agreement with the NSF.
PY - 1999/7/1
Y1 - 1999/7/1
N2 - We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.
AB - We have examined Faint Object Spectrograph data from the Hubble Space Telescope archive for C IV λλ1548, 1550 absorption associated with 40 Mg II λλ2796, 2803 absorption-selected galaxies at 0.4 ≤ z ≤ 1.4. We report a strong correlation between Mg II kinematics, measured in ∼6 km s-1 resolution HIRES/Keck spectra, and Wr(1548); this implies a physical connection between the processes that produce "outlying velocity" Mg II clouds and high-ionization galactic/halo gas. We found no trend in ionization condition Wr(1548)/Wr(2796) with galaxy-QSO line-of-sight separation for 13 systems with confirmed associated galaxies, suggesting no obvious ionization gradient with galactocentric distance in these intermediate-red shift galaxies. We find tentative evidence (2 σ) that Wr(1548)/Wr(2796) is anticorrelated with galaxy B-K color; if further data corroborate this trend, in view of the strong C IV-Mg II kinematics correlation, it could imply a connection between stellar populations, star formation episodes, and the kinematics and ionization conditions of halo gas at z ∼ 1.
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U2 - 10.1086/312102
DO - 10.1086/312102
M3 - Article
AN - SCOPUS:0039164081
SN - 0004-637X
VL - 519
SP - L43-L46
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 PART 2
ER -