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24 April 2024 |
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HST morphologies of local Lyman break galaxy analogs I: Evidence for starbursts triggered by merging | | Roderik A. Overzier
; Timothy M. Heckman
; Guinevere Kauffmann
; Mark Seibert
; R. Michael Rich
; Antara Basu-Zych
; Jennifer Lotz
; Alessandra Aloisi
; Stephane Charlot
; Charles Hoopes
; D. Christopher Martin
; David Schiminovich
; | | Date: |
Thu, 20 Sep 2007 20:31:53 GMT (1880kb) | | Abstract: | Heckman et al. (2005) used the Galaxy Evolution Explorer (GALEX) UV imaging
survey to show that there exists a rare population of nearby compact
UV-luminous galaxies (UVLGs) that closely resembles high redshift Lyman break
galaxies (LBGs). We present HST images in the UV, optical, and Halpha, and
resimulate them at the depth and resolution of the GOODS/UDF fields to show
that the morphologies of UVLGs are also similar to those of LBGs. Our sample of
8 LBG analogs thus provides detailed insight into the connection between star
formation and LBG morphology. Tidal features or companions can be seen in all
of the undegraded, rest-frame optical images, suggesting that the starbursts
are always the result of a merger or interaction. The UV/optical light is
dominated by unresolved (~100-300 pc) super starburst regions (SSBs). The
structural features revealed by the new HST images occur on very small physical
scales and are thus not detectable in images of high redshift LBGs, except in a
few cases where they are magnified by gravitational lensing. We propose,
therefore, that LBGs are mergers of gas-rich, relatively low-mass (M*~10^10
Msun) systems, and that the mergers trigger the formation of SSBs. If galaxies
at high redshifts are dominated by SSBs, then the faint end slope of the
luminosity function is predicted to have slope alpha~2. Our results are the
most direct confirmation to date of models that predict that the main mode of
star formation in the early universe was highly collisional. | | Source: | arXiv, 0709.3304 | | Services: | Forum | Review | PDF | Favorites | |
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