AAS Meeting #193 - Austin, Texas, January 1999
Session 49. Galaxy Evolution
Oral, Thursday, January 7, 1999, 10:00-11:00am, Ballroom B

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[49.02] The NICMOS GRISM Parallel Survey: H Alpha Emission-Line Galaxies at 0.7 < z < 1.9

P. J. McCarthy, R. J. Weymann, L. Yan (OCIW), W. Freudling (ESO), M. A. Malkan (UCLA), H. I. Teplitz, E. M. Malumuth, J. P. Gardner (NASA/GSFC), R. Thomspon (Arizona), R. E. Williams (STScI)

We have analyzed NICMOS parallels obtained with the G141 (\lambdac = 1.5\mu, \Delta\lambda = 0.8\mu) grism. These slitless spectra cover the wavelength range from 1.2 to 1.9 microns and reach typical continuum and line depths of H = 22 and 5 \times 10-17 erg cm-2 sec-1. We find strong line emission in 32 objects, after surveying an area of 85 square arc-minutes. Assuming that most of the emission-lines are H\alpha at 0.7 < z < 1.9, the implied star formation rates range from 2 to 160 M\odot yr-1. These star-forming galaxies have luminosities and space densities similar to present-day L* galaxies and may be the z = 1 - 2 analogs of the z = 3 galaxies identified from their UV continuum breaks.


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