Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743323m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #433.23; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Flexible Image Transport (FITS) images produced from numerical cosmological simulations of dark and baryonic matter are analyzed using Source Extractor (SExtractor), a tool frequently used in observational image analysis. The goal is to assist the interpretation of simulation by better understanding how simulation data might appear in the observational domain.
The simulation model, based on Gadget-2 (Springel and Hernquist, 2003) includes gas heating, cooling and star formation. The stellar components of the model are processed by the Bruzual-Charlot (BC03) stellar population models to produce SEDs (Spectral Energy Distributions). These are then folded with different infrared filters, including selected filters from WFC3 and the proposed Near Infrared Camera (NIRCam) for the James Webb Space Telescope (JWST). The simulation data are taken at different redshifts from z 4 to 11, re-sized according to their comoving distances, converted to FITS format files and combined with noise to simulate instrument and background effects. The images are then analyzed with SExtractor to find groupings which are identified as galaxies or galaxy building blocks. Photometry is performed on these objects using SExtractor to extract luminosity functions in the emitted rest frames. Initially, minimal noise levels are used to allow fine details of the model to be "observed.” More realistic sky background levels are then added to estimate the effect of artifacts of observation.
We use these models to predict the faint-end Schechter slope evolution alpha(z). We compare these models to the most recent Hathi et al. (2010, ApJ, 720, 1708 ) data, and find good agreement in the faint end slope evolution: predicted alpha (7>z>5) = -1.7 to -1.8, observed alpha (z>5) = -1.75 .
Morgan Robert J.
Scannapieco Evan
Thacker Robert
Windhorst Rogier A.
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