Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 56, p. 10-15 (2017)

Baryon Tully-Fisher relation for galaxies from the 2MFGC catalog

Yu. Kudrya, Ph.D
Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv


Baryon and stellar (mass) Tully-Fisher (TF) relations calibrated on samples of galaxies from the 2MFGC catalog, having hydrogen mass estimates, are presented. The relations have been calibrated for both the initial sample of galaxies with the size N = 2988, formed from data of HyperLEDA and the 2MFGC catalog, and the relations based on subsamples cleaned in certain way. The two-parameter baryon TF relation for the cleaned sample with size N = 2831 and the corresponding stellar relation for the cleaned sample of size N = 2790 are characterized by standard deviations  and , respectively. By analogy with the “usual” infrared Tully-Fisher relations (that is, relations of absolute stellar magnitudes on the width of the 21-cm radio-line or on the rotation velocity of galaxies), we try to improve the relations by introducing four additional regressors (surface brightness, concentration index, color and axes ratio). It appeared that the introduction of additional regressors into the baryon and stellar TF relations for the initial sample N = 2988 improves  by 11% and  by 17.5%, respectively. It also appeared that the six-parameter baryon and stellar TF relations are characterized by the same values  and  as the two-parameter regressions for somewhat larger sizes of cleaned samples, that is, the multiparameter relations make it possible to estimate the baryon and stellar masses for a somewhat larger number of galaxies at the same level of accuracy. In this paper, on our samples, we confirm the known fact that baryon TF relations have a smaller scatter in comparison with the corresponding stellar relations. The two-parameter baryon NF relation on the cleaned sample appeared to be consistent with the relation for hyperfine disk galaxies.

Key words
galaxies, Tally-Fisher’s dependence, Tally-Fisher’s baryon dependence, baryon masses of galaxies, star masses of galaxies.

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DOI: https://doi.org/10.17721/BTSNUA.2017.56.9-15