Tracing the Outer Optical Disk of Sculptor Group Spiral NGC 7793

Details Tracing the Outer Optical Disk of Sculptor Group Spiral NGC 7793 Tracing the Outer Optical Disk of Sculptor Group Spiral NGC 7793

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543215m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #432.15; Bulletin of the American Astronomical Society, Vol. 42, p.369

Astronomy and Astrophysics

Astronomy

Scientific paper

Resolved giant stars in the nearby Sculptor Group galaxies are being studied in deep ground-based images to trace disk truncation beyond the H I limit. We recently used the SOAR Optical Imager + Sloan r’ filter on that 4.1-m telescope in worse than median Cerro Pachon seeing (0.8 arcsec FWHM). We summed 10,000 seconds of exposure of a 5.5’ by 5.5’ patch of the outer disk of NGC 7793 away from Sculptor Group dwarfs and bright field stars. Our stack does include background compact galaxies and clusters that must be excluded. Preliminary culling retains 7000 stars and suggests that their photometry is complete to deeper than 27 mag at 3-sigma detection. We will report on the resulting final radial profile and its implications.

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