HST/FOS Spectroscopy of Early--Type Radio Galaxies at z$\le$0.6
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- Session 5 -- Cosmology and Gravitational Lenses
- Display presentation, Monday, 9:20-6:30, Heller Lounge Room
[5.04] HST/FOS Spectroscopy of Early--Type Radio Galaxies at z$\le$0.6
S.M.Pascarelle, R.A.Windhorst (ASU), W.C.Keel (U of Al.), F.Bertola (Padova), P.J.McCarthy (OCIW), R.W.O'Connell (UVa), A.Renzini (Bologna), H.Spinrad (UCB)
We present the results of a Cycle 2 HST project to do systematic
UV--spectroscopy of faint radio galaxies selected with 0.1$We will present the available FOS spectra (as of May 1993) and WFC images of
four weak radio galaxy pairs with separations such that they can be observed as
coordinated parallels to the primary FOS exposures. All spectra were processed
with the best available darks, and reprocessed with the most recent FOS flats.
The early--type galaxy 53W046 shows a moderately strong Ly--$\alpha$ emission
line at z=0.530, possibly the first discovery of Ly--$\alpha$ in an early--type
galaxy with z$\simeq$0.5, which cannot be done with IUE nor from the ground. The
galaxy also has a faint UV--continuum which appears to turn up below 1500$\AA$
in the restframe. We subtracted the worst-- and best--case UV--sky values
measured with UIT close to our NEP--field, and are currently assessing the
possibility of a hot UV--upturn in the FOS spectra. We will use this data to
set limits on the presence of any hot (old or young) stellar populations in
early--type galaxies at z=0.1--0.6. This work is supported by NASA/STScI grant
GO--3545--01--91A, and by the Alfred P. Sloan Foundation (to RAW).
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