Measuring the Small Angle Correlation Function in HST Data

Details Measuring the Small Angle Correlation Function in HST Data Measuring the Small Angle Correlation Function in HST Data

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21115812m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #158.12

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We make the first statistically significant measurement of the small angle correlation function (SACF). Our improvement on previous measurements stems from using better data, designing source extraction routines that do not exclude close pairs and creating custom images to estimate small angle systematics. We use the faintest sources in the Hubble GOODS and UDF datasets (25 < V < 29) and find that their correlation functions exceed unity on subarcsecond scales.
The correlation functions of these sources are consistent with a power law with exponent of roughly -2 and different correlation angles which range between .3" and 1". This is notably different from the cosmological angular correlation function which has an exponent of roughly -.7. This shows that the SACF is influenced by galactic-scale physics. We believe this measurement can be used to constrain galactic formation models. In addition, we will using the lensing of the SACF as a distance probe to these faint sources.

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