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Statistical assessment of the relation between the inferred morphological type and the emission-line activity type of a large sample of galaxies

Published online by Cambridge University Press:  01 July 2015

R. A. Ortega-Minakata ,
J. P. Torres-Papaqui ,
H. Andernach  and
J. M. Islas-Islas
R. A. Ortega-Minakata
Affiliation:
Departamento de Astronomá, Universidad de Guanajuato, 36000, Guanajuato, Mexico
J. P. Torres-Papaqui
Affiliation:
Departamento de Astronomá, Universidad de Guanajuato, 36000, Guanajuato, Mexico
H. Andernach
Affiliation:
Departamento de Astronomá, Universidad de Guanajuato, 36000, Guanajuato, Mexico
J. M. Islas-Islas
Affiliation:
Departamento de Astronomá, Universidad de Guanajuato, 36000, Guanajuato, Mexico Universidad Tecnológica de Tulancingo, 43642, Hidalgo, Mexico
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Abstract

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We quantify the statistical evidence of the relation between the inferred morphology and the emission-line activity type of galaxies for a large sample of galaxies. We compare the distribution of the inferred morphologies of galaxies of different dominant activity types, showing that the difference in the median morphological type between the samples of different activity types is significant. We also test the significance of the difference in the mean morphological type between all the activity-type samples using an ANOVA model with a modified Tukey test that takes into account heteroscedasticity and the unequal sample sizes. We show this test in the form of simultaneous confidence intervals for all pairwise comparisons of the mean morphological types of the samples. Using this test, scarcely applied in astronomy, we conclude that there are statistically significant differences in the inferred morphologies of galaxies of different dominant activity types.

Keywords

methods: statisticalgalaxies: statisticsgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 362 - 364
Copyright
Copyright © International Astronomical Union 2015 

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