The 2MASS Tully-Fisher relation for flat edge-on galaxies

The spiral edge-on galaxies from the ``Revised Flat Galaxy Catalog'' (RFGC) are identified with the Extended Source Catalog of the Two Micron All Sky Survey (2MASS). The relative number of 2MASS detected galaxies is 2996/4236 = 0.71. We consider the statistical properties of the Tully-Fisher relations for the edge-on galaxies in the B, I, J, H, and K<sub>s</sub> bands. The slope of derived TF relations increases steadily from 4.9 in the B band to 9.3 in the K one. The effect is mainly due to the internal extinction, which is different in dwarf and giant spiral galaxies seen edge-on, that leads to the tight correlation between galaxy color and luminosity. The moderate scatter of the RFGC galaxies in the ``color-luminosity'' diagram, 0fm 86, provides us with a ``cheap'' method of mass measurements of distances to galaxies on the basis of modern photometric sky surveys.