HST NICMOS SNAPSHOT observations of field galaxies at z < 1

Details HST NICMOS SNAPSHOT observations of field galaxies at z < 1 HST NICMOS SNAPSHOT observations of field galaxies at z < 1

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7895i&link_type=abstract

HST Proposal ID #7895

Mathematics

Logic

Hst Proposal Id #7895 Galaxies

Scientific paper

We propose NICMOS snapshot observations of statistically uniform sample of 50 field galaxies {I_ST <=sssim 21} for which both HST morphological information and spectroscopic redshifts are available. The proposed NICMOS observation will provide their morphology in rest frame NIR wavelengths {8000 - 16000 A}, where the effect of dust extinction is less severe, and their near infrared {NIR} colors. The morphologies and NIR colors will be used to study: {i} color gradients inside elliptical galaxies to test models of their formation; {ii} the effect of the dust extinction on the properties of field galaxies at 0 < z < 1, which will help to resolve the large difference encountered between the estimates of the global star formation rate {SFR} from the optical surveys and from the ISO; {iii} the evolution of colors of bulges and B/T ratio of spiral galaxies as a function of redshifts, and {iv} old stellar population in each type of galaxies. The near infrared data for elliptical galaxies will also provide a sample of ellipticals which do not act as gravitational lenses to be compared directly with the V,I,H data of lensing ellipticals to study the role of dust in gravitational lenses and its effect on the estimate of the cosmological constant Lambda. The median redshift of our sample of galaxies is z 0.5 and this corresponds to about one half of the current age of the universe.

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