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Journal Articles The Astrophysical Journal Year : 2022

Simulating Jellyfish Galaxies: A Case Study for a Gas-rich Dwarf Galaxy

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Jaehyun Lee
  • Function : Author
Taysun Kimm
  • Function : Author
Harley Katz
  • Function : Author
Wonki Lee
  • Function : Author
Yun-Kyeong Sheen
  • Function : Author
Julien Devriendt
  • Function : Author
Adrianne Slyz
  • Function : Author

Abstract

We investigate the formation of jellyfish galaxies using radiation-hydrodynamic simulations of gas-rich dwarf galaxies with a multiphase interstellar medium (ISM). We find that the ram-pressure-stripped (RPS) ISM is the dominant source of molecular clumps in the near wake within 10 kpc from the galactic plane, while in situ formation is the major channel for dense gas in the distant tail of the gas-rich galaxy. Only 20% of the molecular clumps in the near wake originate from the intracluster medium (ICM); however, the fraction reaches 50% in the clumps located at 80 kpc from the galactic center since the cooling time of the RPS gas tends to be short owing to the ISM-ICM mixing (≲10 Myr). The tail region exhibits a star formation rate of 0.001-0.01 M yr-1, and most of the tail stars are born in the stripped wake within 10 kpc from the galactic plane. These stars induce bright Hα blobs in the tail, while Hα tails fainter than 6 × 1038 erg s-1 kpc-2 are mostly formed via collisional radiation and heating due to mixing. We also find that the stripped tails have intermediate X-ray-to-Hα surface brightness ratios (1.5 ≲ F X/F ≲ 20), compared to the ISM (≲1.5) or pure ICM (≫20). Our results suggest that jellyfish features emerge when the ISM from gas-rich galaxies is stripped by strong ram pressure, mixes with the ICM, and enhances the cooling in the tail.
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Dates and versions

insu-03711523 , version 1 (02-07-2022)

Licence

Attribution - CC BY 4.0

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Jaehyun Lee, Taysun Kimm, Jérémy Blaizot, Harley Katz, Wonki Lee, et al.. Simulating Jellyfish Galaxies: A Case Study for a Gas-rich Dwarf Galaxy. The Astrophysical Journal, 2022, 928, ⟨10.3847/1538-4357/ac5595⟩. ⟨insu-03711523⟩
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