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Mid-UV Determination of Elliptical Galaxy Abundances and Ages
Jennifer M. Lotz, Henry C. Ferguson, Ralph C. Bohlin
We investigate the effects of abundance and age on the mid-UV spectra and Mg_{2} strengths of stellar populations using simple population synthesis models. These models are used to…
The Unusual Infrared Object HDF-N J123656.3+621322
Mark Dickinson, Christopher Hanley, Richard Elston +11
We describe an object in the Hubble Deep Field North with very unusual near-infrared properties. It is readily visible in Hubble Space Telescope NICMOS images at 1.6um and from the…
HST and Palomar Imaging of GRB 990123: Implications for the Nature of Gamma-Ray Bursts and their Hosts
Andrew S. Fruchter, S. E. Thorsett, Mark R. Metzger +13
We report on HST and Palomar optical images of the field of GRB 990123, obtained on 8 and 9 February 1999. We find that the optical transient (OT) associated with GRB 990123 is loc…