Surface brightness contours for the central regions of NGC 4649 in Virgo.
Isophote Shapes |
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Surface brightness contours for the central regions of NGC 4649 in Virgo.
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| Sersic profile fit to NGC 4472. Fits to the isophotes yield as functions of R: ellipticity, position angle, and the two non-elliptical parameters a3 and a4. The SDSS image is on the right, with a line indicating the extent of the fits on the left (SDSS is relatively shallow compared to the deeper data from the McDonald 0.8 meter). | |