Tests of the Tully-Fisher Relation II: Scatter Using Optical Rotation Curves
نویسندگان
چکیده
We investigate the amount of scatter in the Tully-Fisher relation (TFR) when using optical long-slit Hα rotation curves to determine the velocity widths of spiral galaxies. We study a sample of 25 galaxies in the Coma region of the sky which were shown in Bernstein et al. (1994) to exhibit an extraordinarily low scatter of 0.10 mag RMS in the I magnitude vs 21-cm width TFR. Using the same I magnitudes with new widths derived from high-quality Hα rotation curves, we measure an RMS scatter of 0.14 mag in the TFR. This suggests that measurement Based on observations obtained with the Multiple Mirror Telescope, a joint facility of the Smithsonian Institution and the University of Arizona.
منابع مشابه
Tests of the Tully-fisher Relation Ii: Scatter Using Optical Rotation Curves 1
We investigate the amount of scatter in the Tully-Fisher relation (TFR) when using optical long-slit H rotation curves to determine the velocity widths of spiral galaxies. We study a sample of 25 galaxies in the Coma region of the sky which were shown in Bernstein et al. (1994) to exhibit an extraordinarily low scatter of 0.10 mag RMS in the I magnitude vs 21-cm width TFR. Using the same I magn...
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