| |
 |
| Paper: |
Weak Mg II Absorbers at z~1: Low N(HI) HVCs, SNR in Dwarf Galaxies, or Population III Remnants? |
| Volume: |
240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA |
| Page: |
58 |
| Authors: |
Rigby, J. R.; Charlton, J. C.; Churchill, C. W. |
| Abstract: |
Using photo-ionization models, we investigate ``weak Mg II absorbers,'' which are narrow (3-7 km s-1), high-metallicity systems not directly associated with >0.1 L* galaxies. These systems do not produce Lyman limit breaks, and thus have metallicities >=0.1 solar. They account for a substantial fraction of N(HI)~1016 cm-2 Lyα forest clouds. We identify a subclass of systems with relatively high Fe II, which are constrained to be ~10 pc. For this inferred size and dN/dz = 0.2 as observed, these clouds outnumber galaxies by roughly six orders of magnitude. They may be old Type Ia supernova shells in low-luminosity structures such as dwarf galaxies, or may be faded Pop III star clusters embedded in cold dark matter mini-halos. We also identify a low Fe II subclass, which may be low N(HI) high velocity clouds at z~1. |
|
|
|
|
|
