The evolution of merger fraction of galaxies at z < 0.6 depending on the star formation mode in the AKARI NEP-Wide Field. Issue 3 (6th September 2021)

• Record Type: Journal Article
• Authors: 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; Wang, Ting-Wen
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 507:Issue 3(2021)
• Page Start: 3113
• Page End: 3124
• Publication Date: 2021-09-06
• Subjects: galaxies: evolution -- galaxies: formation -- galaxies: spiral -- galaxies: starburst -- galaxies: star formation -- infrared: galaxies; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab2090
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We study the galaxy merger fraction and its dependence on star formation mode in the 5.4 deg 2 of the North Ecliptic Pole-Wide Field. We select 6352 galaxies with AKARI 9 $\mu$ m detections, and identify mergers among them using the Gini coefficient and M 20 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 $9\, \mu$ m. 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.