Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..405d&link_type=abstract
NOAO Proposal ID #1999A-0405
Other
Scientific paper
We propose to use CRSP to obtain infrared spectra of ``extreme dropout'' objects: galaxies found in deep near-infrared images which have no detected optical flux. The most dramatic example is an object found in our new NICMOS imaging map of the Hubble Deep Field (HDF), which is detected only at 1.6(micron) but is invisible at all other wavelengths, despite the extreme sensitivity of the HST WFPC2 and NICMOS cameras. A second HDF object has a similarly steep flux increase from 1.1 to 1.6(micron) and is also a faint radio source, but has faint diffuse optical emission. We have furthermore defined a sample of brighter (K ~ 19-20) objects from the wide-field IR-optical survey of Elston et al. (EES) which have relatively flat J-K colors but which drop out at I or z. The nature of these objects is unknown: the most dramatic possibility is that some may lie at extreme redshifts, perhaps z > 9 for the HDF object. Others may be extremely dusty, or the broad band infrared emission may consist entirely of line emission. Because of their flux distributions, infrared spectroscopy is the only reasonable way to address their nature observationally.
Dickinson Mark
Eisenhardt Peter
Elston Richard
Stanford Spencer A.
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