Surface photometry of galaxies. I - NGC 3379 and M 81

Details Surface photometry of galaxies. I - NGC 3379 and M 81 Surface photometry of galaxies. I - NGC 3379 and M 81

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992balta...1....7t&link_type=abstract

Baltic Astronomy, vol. 1, p. 7

Astronomy and Astrophysics

Astronomy

4

Astronomical Photometry, Galactic Structure, Data Reduction

Scientific paper

Two-dimensional photographic surface photometry has been derived for the standard elliptical galaxy NGC 3379 in the B-color and for the spiral galaxy M 81 in the B- and U-colors. Galactic isophotes have been approximated by ellipses, and the major and minor axes profiles for the observed galaxies have been derived. The brightness profile in the EW-direction for NGC 3379 has been compared with the standard luminosity distribution of de Vaucouleurs and Capaccioli (1983). We find that our image processing system enables us to derive accurate results at least up to 1 percent from the sky level. Our results for the color structure of M 81 indicate that the U-B color index of the galaxy becomes bluer outwards. Isophotes of the color index are similar to the isophotes of the B surface brightness.

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