Galaxy Formation from Subgalactic-sized Clumps at Z =~ 2.39

Details Galaxy Formation from Subgalactic-sized Clumps at Z =~ 2.39 Galaxy Formation from Subgalactic-sized Clumps at Z =~ 2.39

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.8302p&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #83.02; Bulletin of the American Astronomical Society, Vol. 28, p.1386

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The discovery of numerous compact star-forming objects at z =~ 2.39 in several distinct regions of the sky with the Hubble Space Telescope (HST) represents the first direct observations of what may be the building blocks of present-day luminous galaxies. The HST medium-band F410M filter (centered at 4100{ Angstroms}) was used with WFPC2 to image Lyman-alpha emission at z =~ 2.39, which along with broad-band B_F450W, V_F606W, and I_F814W images, found 18 candidates in a field surrounding the weak radio galaxy 53W002. Thus far, eight of the original 18 candidates from this field have either MMT or Keck spectroscopic confirmations, along with one possible new detection in Hα from CVF and K observations at the IRTF. More than a dozen additional z =~ 2.39 candidates have been found with HST using the same method in two independent fields from recent Cycle 6 parallel WFPC2/F410M observations. Our hypothesis is that such a widespread population of subgalactic-sized clumps exists throughout the redshift range z=1-4, and provides a reservoir of building blocks for the formation of the present-epoch early-type galaxies through the process of repeated hierarchical merging (with a merger rate that was most likely higher in the past). Finding similar objects in random fields with F410M suggests that these objects are indeed ubiquitous, and are part of the high-redshift (z=1-4) faint blue galaxy population. Still, some clustering is evident because the velocity dispersion of most of the 53W002 field objects (_

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