Infrared Imaging of High Redshift {0.4 <= z <= 1} Tully-Fisher Galaxies

Details Infrared Imaging of High Redshift {0.4 <= z <= 1} Tully-Fisher Galaxies Infrared Imaging of High Redshift {0.4 <= z <= 1} Tully-Fisher Galaxies

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7883v&link_type=abstract

HST Proposal ID #7883

Computer Science

Hst Proposal Id #7883 Galaxies

Scientific paper

With the advent of 10-m class telescopes combined with the high spatial resolution of the HST, it is now possible to study the internal kinematics and structural properties of galaxies out to a redshift of z 1. For the first time we can derive the fundamental structural parameters {e.g. disk scale length R_d, rotation velocity V_c and mass M} and use them to directly trace the structure evolution for classes of galaxies. Recent models of galaxy formation contain predictions which can be directly tested with such observables. We propose to obtain NIC2 F160W images of a sample of 21 galaxies in the redshift range 0.4 <= z <= 1 for which we have previously obtained rotation curves on the Keck Telescopes, and for which WFPC2 F814W images already exist. The I flux comes from restframe UV and B for these galaxies, though, and thus the images are heavily weighted by young star formation regions and very sensitive to the effects of dust. We propose to use the NICMOS images to map the surface brightness of the underlying long-lived quiescent stellar population to measure the fundamental disk scale lengths. Combined with rotation curves from Keck, this will be used to verify the theoretical prediction that, at a fixed V_c, R_d should increase by as much as a factor of two from z=1 to z=0. In addition, we will subtract NICMOS images from blue WFPC2 images to reveal the young stellar population whose flux and spatial distribution will be compared to young populations in local spirals.

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