Oral Presentation

An investigation of Star Formation Activity of Jellyfish Galaxies in Massive Galaxy Clusters with Gemini GMOS/IFU

Author(s): Jeong Hwan Lee(SNU), Myung Gyoon Lee(SNU), Jisu Kang(SNU), Brian S. Cho(SNU), Jae Yeon Mun(SNU)

Presenter: Jeong Hwan Lee (Seoul National University (SNU))

Jellyfish galaxies are starburst galaxies formed by strong ram-pressure stripping (RPS), whose disks and tails have plenty of blue knots. These interesting star-forming knots make jellyfish galaxies very unique and useful targets to understand how their star formation (SF) activity relates to RPS. Integral field unit (IFU) observations have been widely used to study their SF activity, but they have been limited to jellyfish galaxies in low-mass clusters. In this study, we present a Gemini GMOS/IFU study of three extreme jellyfish galaxies in massive clusters. Their host clusters are very massive and dynamically unrelaxed, implying that the RPS effects in these clusters are much stronger compared to low-mass clusters. Our results show that both the star formation rates (SFR) and specific SFR (sSFR) of our sample galaxies are much higher than those of jellyfish galaxies in low-mass clusters. These results suggest that strong RPS in massive clusters enhances the SF activity of jellyfish galaxies.