Discovery of a Cluster of Young Galaxies at Z =~ 2.40 in Deep HST WFPC2 Images: Formation from Sub-galactic Size Clumps?

Details Discovery of a Cluster of Young Galaxies at Z =~ 2.40 in Deep HST WFPC2 Images: Formation from Sub-galactic Size Clumps? Discovery of a Cluster of Young Galaxies at Z =~ 2.40 in Deep HST WFPC2 Images: Formation from Sub-galactic Size Clumps?

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18711001p&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #110.01; Bulletin of the American Astronomical Society, Vol. 27, p.1442

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the discovery of a large number of significant, compact Lyman-alpha emitting candidates at z =~ 2.40 in Cycle 5 HST WFPC2 images. The F410M filter (Lyman-alpha at z =~ 2.40) was used, in conjunction with F450W for continuum subtraction, to find at least 16 potential z =~ 2.40 objects within a 0.5h100(-1) Mpcx0.5h100(-1) Mpc region (q_o=0.5). Earlier ground-based narrow- and broad-band photometry on the same field yielded only four cluster candidates (Pascarelle, et al. 1995, ApJL). Four of the 16 have been spectroscopically confirmed to be at z =~ 2.40. All candidates are much smaller than the median scale-length of WFPC2 field galaxies at the same magnitude. They have half-light radii =~ 0.11'' or =~ 0.43h100(-1) kpc, and have luminosities in the range M_v=--18 to M_v=--23 (<0.1-1L(*) at z =~ 2.40). It is most likely because of the very small scale-lengths of these sub-galactic clumps that previous ground-based Lyman-alpha primeval galaxy searches have been largely unsuccessful. Lyman-alpha searches for such compact objects carried out in typical ground-based seeing and sky brightness would take about 200 times longer than with WFPC2 and F410M, indicating that HST may hold the secret to success in proto-galaxy searches. We propose that these sub-galactic clumps could have grown into the luminous giant galaxies (E/S0 and early-type spirals) seen today, through the CDM process of repeated (hierarchical) merging.

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