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The Star-Forming Dwarf Galaxy Populations of two z ~ 0.4 Clusters: MS1512.4+3647 and Abell 851 | | J. M. Lotz
; C. L. Martin
; H. C. Ferguson
; | | Date: |
17 Jun 2003 | | Journal: | Astrophys.J. 596 (2003) 143-158 | | Subject: | astro-ph | | Affiliation: | 1,2), C. L. Martin , H. C. Ferguson ( UC Santa Cruz, Johns Hopkins University, UC Santa Barbara, Space Telescope Science Institute | | Abstract: | We present the results of a deep narrow-band [OII] 3727 AA emission-line search for faint ($g <$ 27), star-forming galaxies in the field of the $z=0.37$ MS1512.4+3647 cluster. We find no evidence for an over-density of emission-line sources relative to the field at $z sim$ 0.4 (Hogg et al. 1998), and therefore conclude that the MS1512.4+3647 sample is dominated by field [OII] emission-line galaxies which lie along the $sim$ 180 Mpc line of sight immediately in front and behind the cluster. This is surprising, given that the previously surveyed $z=0.41$ cluster Abell 851 has 3-4 times the field emission-line galaxy density (Martin et al. 2000). We find that the MS1512.4+3647 sample is deficient in galaxies with intermediate colors (1.0 $< g-i <$ 2.0) and implied star-formation exponential decay timescales $ au sim$ 100 Myr - 1 Gyr that dominate the Abell 851 emission-line galaxy population. Instead, the majority of [OII] emission-line galaxies surrounding the MS1512.4+3647 cluster are blue ($g-i leq 1.0$) and forming stars in bursts with $ au < $ 100 Myr. In both samples, galaxies with the shortest star-formation timescales are preferentially among the faintest star-forming objects. Their i luminosities are consistent with young stellar populations $sim 10^8 - 10^9 Msun$, although an additional factor of ten in stellar mass could be hiding in underlying old stellar populations. We discuss the implications for the star-formation histories of dwarf galaxies in the field and rich clusters. | | Source: | arXiv, astro-ph/0306348 | | Services: | Forum | Review | PDF | Favorites | |
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