One Megacam Field is not Enough! The Huge Nearby Dwarf Galaxy NGC 6822

Details One Megacam Field is not Enough! The Huge Nearby Dwarf Galaxy NGC 6822 One Megacam Field is not Enough! The Huge Nearby Dwarf Galaxy NGC 6822

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..135d&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.135

Astronomy and Astrophysics

Astronomy

Scientific paper

Four Megacam fields, covering a 2 × 2 degree area centred on NGC 6822, are used to investigate the structure of this Local Group dwarf. The position and magnitude of nearly one million stars have been measured by Terapix. Elliptical isodensity contours are deduced from star counts to show that the stellar halo of NGC 6822 has an ellipticity of 0.35. The position angle of the major axis, at 65 degrees differs considerably from the H i disk whose PA= 120 deg. Isodensity contours can be traced to a semi-major axis of 37 arcmin, implying that NGC 6822 has a diameter of at least 11 kpc, certainly comparable in size to the SMC.

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