The evolution of merger fraction of galaxies at z < 0.6 depending on the star formation mode in the AKARI NEP-Wide Field

Kim, Eunbin; Hwang, Ho Seong; Jeong, Woong-Seob; Kim, Seong Jin; Burgarella, Denis; Goto, Tomotsugu; Hashimoto, Tetsuya; Jo, Young-Soo; Lee, Jong Chul; Malkan, Matthew; Pearson, Chris; Shim, Hyunjin; Toba, Yoshiki; Ho, Simon C-C; Santos, Daryl Joe; Ikeda, Hiroyuki; Kim, Helen K; Miyaji, Takamitsu; Matsuhara, Hideo; Oi, Nagisa; Takagi, Toshinobu and Wang, Ting-Wen (2021). The evolution of merger fraction of galaxies at z < 0.6 depending on the star formation mode in the AKARI NEP-Wide Field. Monthly Notices of the Royal Astronomical Society, 507(3) pp. 3113–3124.

DOI: https://doi.org/10.1093/mnras/stab2090

Abstract

We study the galaxy merger fraction and its dependence on star formation mode in the 5.4 deg² of the North Ecliptic Pole-Wide Field. We select 6352 galaxies with AKARI 9 µm detections, and identify mergers among them using the Gini coefficient and M₂₀ derived from the Subaru/Hyper Suprime-Cam (HSC) optical images. We obtain the total infrared luminosity and star formation rate of galaxies using the spectral energy distribution templates based on one band, AKARI 9 µm. We classify galaxies into three different star formation modes (i.e. starbursts, main-sequence, and quiescent galaxies) and calculate the merger fractions for each. We find that the merger fractions of galaxies increase with redshift at z < 0.6. The merger fractions of starbursts are higher than those of main-sequence and quiescent galaxies in all redshift bins. We also examine the merger fractions of far-infrared-detected galaxies that have at least one detection from Herschel/Spectral and Photometric Imaging Receiver (SPIRE). We find that Herschel-detected galaxies have higher merger fraction compared to non-Herschel-detected galaxies, and both Herschel-detected and non-Herschel-detected galaxies show clearly different merger fractions depending on the star formation modes.

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