Search for Emission Line Galaxies in the Near Infrared Using the NICMOS Grism Data

Details Search for Emission Line Galaxies in the Near Infrared Using the NICMOS Grism Data Search for Emission Line Galaxies in the Near Infrared Using the NICMOS Grism Data

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8379y&link_type=abstract

HST Proposal ID #8379

Physics

Hst Proposal Id #8379 Distant Galaxies

Scientific paper

NICMOS has produced a wealth of grism spectroscopic data in the 0.8Mu to 1.9Mu wavelength range. To date roughly 650 primary and parallel orbits of grism data have been obtained at high and intermediate galactic latitudes. We propose an archival research program using this database to search for high redshift emission line objects, to measure the global star formation history at various epochs and to study the evolution of field galaxies. We have analyzed nearly all of the G141 grism {Lambda 1.1Mu - 1.9Mu} exposures taken to date by the public pure-parallel program. This dataset reaches 3Sigma flux limits of {1 - 0.2}* 10^-16 erg/s/cm^2 for integration times of 2, 000 to 21, 000 seconds. The NICMOS data have lower flux limits than all of the previous near-IR emission-line surveys, including those with the Keck telescopes. We have developed expertise in reducing the NICMOS grism data and have identified 33 emission-line galaxies in 83 square arc-minutes of G141 data. In this proposed program, we will: 1} reduce the entire NICMOS grism GO and GTO data sets; 2} search for emission-line objects over 170 square arcmin, roughly doubling our present sample; {3} derive the global star formation history to z 2; {4} measure the spectral continuum for bright galaxies which don't have emission lines in our observed wavelength range; and {5} make all of the reduced grism data available to the public.

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