The Effective Spectral Resolution of the WFC and HRC Grism

Details The Effective Spectral Resolution of the WFC and HRC Grism The Effective Spectral Resolution of the WFC and HRC Grism

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acs..rept....2p&link_type=abstract

ST-ECF Instrument Science Report ACS 2001-002, 14 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

We present SLIM simulations of the WFC and HRC grism, obtained by varying the object size and orientation with respect to the dispersion axis. Our aim is to quantify the extent by which the object extension along the dispersion axis can degrade the nominal spectral resolution of the grism. We find that the line blending becomes significant for object diameters larger than 2 pixels and object major axis orientations PA < 45o with respect to the dispersion axis. As expected, the spectral resolution of the ACS grism decreases by almost a factor of two as the object size doubles.

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