Morphological and Spectral Evolution of Galaxies

Computer Science

Scientific paper

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Hst Proposal Id #7432 Galaxies

Scientific paper

HST has opened an invaluable window on the high-redhsift universe by providing kiloparsec resolution of distant galaxies. However, since the rest-frame wavelengths of galaxies move further into the UV at increasingly higher redshifts, evolutionary effects are diluted by insufficiently well determined k-corrections. Thus a library of UV images of normal galaxies at low redshifts is essential to our understanding of the properties and evolution of the high redshift universe. Using STIS as a camera {fuv-mama detector, F25SrF2 filter}, we will compile such a library by observing 50 galaxies at low-redshift {Zirbel 1993}. This gallery of images will be unique in its faithful representation of galaxies in the field, and in the high quality of the data: high spatial resolution {0.2"}, isolation of the far-UV flux with negligible visible/red light leak, and excellent photometric characteristics {linear, pulse -counting detector}. We will analyze these images to determine the UV properties of galaxies at the present epoch. We will use this information in conjunction with STIS CCD images to test current scenarios of galaxy evolution and to interpret deep optical surveys such as the Hubble Deep Field. We will also obtain H-band images with NICMOS as coordinated parallels. These images will be used to search for dwarf galaxies in the program fields. {The galaxy groups are thought to be large enough that NICMOS will be viewing the same galaxy group as STIS.}

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