紀要論文

すばる望遠鏡/Suprime-Cam, FOCASを用いたかみのけ座銀河団の星形成率の推定

ESTIMATION OF STAR FORMATION RATE OF THE COMA CLUSTER USING SUBARU/SUPRIME-CAM AND FOCAS

jpn

24368083

https://doi.org/10.15002/00030767

法政大学大学院理工学研究科

法政大学大学院紀要. 理工学研究科編

65

1

8

2024-03-24

Version of Record

We estimated the Hα luminosity function of galaxies in the central region of the Coma cluster using imaging and spectroscopic data from Subaru/Suprime-Cam and Subaru/FOCAS. No faint Coma Hα emitters were found in the spectroscopic data, and most of them were found to be background galaxies. Therefore, we selected the Coma member galaxies using the two-color diagram. The Hα luminosity function reached the luminosity level of L(Hα) = 10^37 erg/s, which is about 100 times fainter than the previous study and showed a gradual increase at the faint end. The major difference compared to the previous study was that the number of galaxies at the brighter end was relatively small. We estimated that star formation rate per unit volume in the central region of the Coma is 0.210 M_⊙ yr^-1 Mpc^-3, which is one order of magnitude smaller than that in the previous study, and the star formation rate contribution from 10^37 < L(Hα) < 10^39 erg/s galaxies is 3.5% of the total. We also find that the star formation activity in the Coma is dominated by to star formation is mainly from massive galaxies with M ≳ 10^9 M_⊙. These differences are suggested to be due to selection effects of Coma Hα emitters and environmental effects of the cluster.

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