An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851

Details An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851 An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851

2000-05-26

arxiv.org/abs/astro-ph/0005534v1

Astronomy and Astrophysics

Astrophysics

13 figures including one GIF image. Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/317073

(Abridged) We present deep, narrow-band images of the redshift 0.41 galaxy cluster Abell 851 (Cl 0939+4713) which isolate [OII] 3726,29 line emission. The [OII]-selected galaxies lie within a projected clustercentric distance of 2 Mpc. The sample is complete to magnitude m_{5129}(AB) = 24.0$ for galaxies with emission-line equivalent widths greater than about 11\angs in the observed frame. Color, brightness, and equivalent-width criteria are used to identify foreground interlopers (steep 4000 A break across the filters) and candidates for Ly-alpha emission at z=3.31. The number density of star-forming galaxies toward Cl~0939+4713 is three to four times higher than that of a similar column through the field at z=0.4. Galaxies in the cluster sample have lower [OII] equivalent widths than similarly selected field galaxies at $z \sim 0.4$ however, and we suggest that while the density of galaxies is higher in the cluster the star-formation activity in individual galaxies is supressed relative to their counterparts in the field. The relatively small enhancement in the surface density of the [OII]-selected population toward the cluster core leads us to believe the [OII]-selected galaxies reside in the outer regions of the cluster. We identify a population of starburst galaxies among the [OII]-emitters based on their blue g-i color. The majority of the [OII]-selected galaxies appear to be related to the normal spiral galaxy population, but the bursting population is dominated by intrinsically faint galaxies of below average size. We suggest that this population is composed primarily of dwarf galaxies and discuss their relation to the dwarf galaxies in present day clusters.

Affiliated with

Also associated with

No associations

Rating

An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Emission-Line Search for Star-Forming Dwarf Galaxies Toward Abell 851 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-706795