Two types of distribution of the gas velocity dispersion of MaNGA galaxies

Autor: Y. A. Nefedyev, Maritza A. Lara-López, José M. Vílchez, Leonid S. Pilyugin, Igor Zinchenko
Přispěvatelé: National Academy of Sciences of Ukraine, Russian Science Foundation, Alfred P. Sloan Foundation, Ministerio de Ciencia, Innovación y Universidades (España), Russian Government, National Science Foundation (US), Department of Energy (US), University of Utah
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: The distribution of the gas velocity dispersion sigma across the images of 1146 MaNGA galaxies is analyzed. We find that there are two types of distribution of the gas velocity dispersion across the images of galaxies: (i) the distributions of 909 galaxies show a radial symmetry with or without the sigma enhancement at the center ("R distribution", radial symmetry in the sigma distribution) and (ii) distributions with a band of enhanced sigma along the minor axis in the images of 159 galaxies with or without the sigma enhancement at the center ("B distribution", band in the sigma distribution). The sigma distribution across the images of 78 galaxies cannot be reliable classified. We select 806 galaxies with the best defined characteristics (this sample includes 687 galaxies with R distribution and 119 galaxies with B distribution) and compare the properties of galaxies with R and B distributions. We find that the median value of the gas velocity dispersion sigma (m) in galaxies with B distribution is higher by around 5 km s(-1), on average, than that of galaxies with R distribution. The optical radius R-25 of galaxies with B distribution is lower by around 0.1 dex, on average, than that of galaxies with similar masses with R distribution. Thus the properties of a galaxy are related to the type of distribution of the gas velocity dispersion sigma across its image. This suggests that the presence of the band of the enhanced gas velocity dispersion can be an indicator of a specific evolution (or a specific stage in the evolution) of a galaxy. © ESO 2021.
We are grateful to the referee for his/her constructive comments. We thank Dr. S.G.Kravchuk for useful discussion. L.S.P acknowledges support within the framework of the program of the NAS of Ukraine Support for the development of priority fields of scientific research? (CPCEL 6541230)"I.A.Z acknowledges support by the grant for young scientist's research laboratories of the National Academy of Sciences of Ukraine. The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University and Russian Science Foundation, grant no. 20-12-00105 We acknowledge the usage of the HyperLeda database (http://leda.univ-lyon1.fr).Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy O ffice of Science. The SDSS-III web site is http://www.sdss3.org/.Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy O ffice of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org
With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709.
Databáze: OpenAIRE
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