Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.1403b&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #14.03; Bulletin of the American Astronomical Society, Vol. 31, p.1394
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present deep near-infrared Keck/NIRC imaging of a recently-discovered z=4.04 galaxy (Frye & Broadhurst 1998). This is lensed by the rich foreground cluster Abell 2390 (z 0.23) into highly-magnified arcs 3--5'' in length. Our H- and K'-band NIRC imaging allows us to map the Balmer +4000 Angstroms break amplitude. In combination with high-quality archival HST/WFPC2 data, we can spatially resolve stellar populations along the arcs. The WFPC2 images clearly reveal several bright knots, which correspond to sites of active star formation. However, there are considerable portions of the arcs are significantly redder, consistent with being observed > 100Myr after star formation has ceased. Keck/LRIS long-slit spectroscopy along the arcs reveals that the Ly-α emission is spatially offset by 1'' from the rest-UV continuum regions. We show that this line emission is most probably powered by star formation in neighboring HII regions, and that the z=4 system is unlikely to be an AGN. This work is described in more detail in Bunker, Moustakas & Davis (2000), to appear in volume 531 #1 of the Astrophysical Journal (1 March 2000) -- see astro/ph-9909476.
Bunker Alex
Davis Martin
Moustakas Leonidas
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