Investigating the effect of galaxy mergers on star-formation rates using spatially resolved stellar mass maps

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Mosleh Moein; Hosseini ShahiSavandi Seyedeh Zahra

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ISSN: 2588-4824

Journal Paper

Paper Information

Journal: Iranian Journal of Physics Research Year:2022 | Volume:22 | Issue:2 (پیاپی 88) Page(s): 481-489

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Title

Investigating the effect of galaxy mergers on star-formation rates using spatially resolved stellar mass maps

Author(s)

Mosleh Moein | Hosseini ShahiSavandi Seyedeh Zahra | Issue Writer Certificate

Keywords

galaxy structureQ4

galaxy evolutionQ4

galaxy mass distributionQ4

galaxy star formationQ4

Abstract

The spatially resolved stellar mass maps of high-redshift (z<2) galaxies are used to separate merging and non-merging galaxies. For this purpose, we used the combination of non-parametric indices such as asymmetry (A), Gini and M20 coefficients. Classification based on the stellar mass maps reduces the effect of large star-forming clumps and hence increases the robustness of the sample selection method. We compared the relative fraction of merging systems with log(M) > 10.5 solar mass, with respect to the star-forming galaxies above and below the star-forming main sequence (SFMS) at different redshift ranges. We found that the fraction of mergers above and below the SFMS at each redshift is comparable. The results show that mergers have small effects on the star-formation rates and the distribution of the merging galaxies about the SFMS.

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