The C IV Absorption-Mg II Kinematics Connection in <Z> ~ 0.7 Galaxies
Abstract
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-redshift 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1999
- DOI:
- 10.1086/312102
- arXiv:
- arXiv:astro-ph/9904273
- Bibcode:
- 1999ApJ...519L..43C
- Keywords:
-
- GALAXIES: EVOLUTION;
- GALAXIES: HALOS;
- GALAXIES: QUASARS: ABSORPTION LINES;
- Galaxies: Evolution;
- Galaxies: Halos;
- Galaxies: Quasars: Absorption Lines;
- Astrophysics
- E-Print:
- Accepted to Astrophysical Journal Letters