Constraints on galaxy formation models from size evolution of galactic disks and spheroids

Details Constraints on galaxy formation models from size evolution of galactic disks and spheroids Constraints on galaxy formation models from size evolution of galactic disks and spheroids

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10290s&link_type=abstract

HST Proposal ID #10290

Physics

Hst Proposal Id #10290 Galaxies

Scientific paper

The radial sizes of disks and spheroids are fundamental properties of galaxies, and must be connected with the efficiency of star formation, yet neither numerical nor semi-analytic galaxy formation models are currently able to model them accurately. We propose to compile measurements of disk and spheroid sizes from the Sloan Digital Sky Survey {SDSS}, Great Observatories Origins Deep Survey {GOODS}, and GEMS {Galaxy Evolution from Morphology and SED} survey to characterize in a single consistent analysis the evolution of galaxy sizes from z=5 to the present. We will confront these observations with predictions from three different paradigms of galaxy evolution: {1} a no-evolution model {2} a backwards-evolution model and {3} a hierarchical model based on semi-analytic techniques. For {3}, we will develop new physically motivated modeling of the sizes of disks and spheroids, which has not previously been done self-consistently in a semi-analytic model set within the complete framework of the Cold Dark Matter merging hierarchy. We will account for the formidable selection and measurement biases and cosmic variance by creating synthetic images based on each model paradigm, and running the actual object detection and structural fitting software on these images to create mock catalogs of "observed" galaxy properties. We will use Bayesian methods to quantify the parts of parameter space that are favored within each paradigm, and to assess which model paradigm is favored overall by the data. By carrying out this program, we hope to gain insight into the physical origin of observed galaxy sizes and fundamental scaling relations and their evolution through cosmic history.

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