Effect of the orientation of spiral galaxies to the line of sight on their diameters and the neural hydrogen mass

Astronomy and Astrophysics – Astronomy

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H I Regions, Mass To Light Ratios, Neutral Gases, Spiral Galaxies, Astronomical Photometry, Brightness Distribution, Galactic Mass

Scientific paper

A sample of 541 late-type southern galaxies with photometric data and HI observations is used to estimate the coefficients c(A) and c(H), which correct the diameters and hydrogen mass of galaxies for the inclination effect. The results confirm the increase of the diameter within a surface brightness level of 25 mag/sq arcsec in the B band (c(A) = -0.23) and show the presence of weak self-absorption (C(H) = 0.05) for an isophote of 25 mag/sq s in the B band. A dependence of self-absorption on spiral-galaxy type is found. Diameters measured at an isophote level of 26 mag/sq arcsec exhibit a smaller increase due to inclination (c(A) = 0.19).

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