Galaxy Formation in Nearby Voids: Reflections of the High-Redshift Universe?

Details Galaxy Formation in Nearby Voids: Reflections of the High-Redshift Universe? Galaxy Formation in Nearby Voids: Reflections of the High-Redshift Universe?

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9403g&link_type=abstract

HST Proposal ID #9403

Mathematics

Logic

Hst Proposal Id #9403

Scientific paper

Galaxy voids, at the opposite environmental extreme from galaxy clusters, present an ideal yet under- utilized laboratory for probing the relationship between environment and the mechanisms of galaxy formation and evolution. Mounting evidence from ground-based surveys of galaxies in voids suggests that they have formed comparatively recently {and many are still forming} from gas-rich, low velocity-dispersion surroundings: a picture in accordance with models of hierarchical structure formation. The superior resolution of HST allows us to verify this hypothesis with the first directed HST imaging survey of void galaxies {VGs}. With HST/ACS deep imaging of a subset of E+S0 VGs from our earlier ground-based imaging and spectroscopic survey, we will investigate their globular cluster {GC} systems to unravel their formation history and to constrain the age of their oldest GCs. The HST resolution of their inner light profiles will reveal whether they have significantly under-massive central black holes, as might be expected if these are young systems. HST will also detect the presence of morphological fine structure indicative of recent merger activity. If the present-day VGs truly reflect the early stages of galaxy formation which occurred at higher redshift outside the voids, their proximity enables the investigation of galaxy formation processes in much greater detail than possible from observations of the high-redshift field, even with NGST.

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