ESO 137-001 -- a jellyfish galaxy model
arXiv:2409.16846 · doi:10.1051/0004-6361/202450435
Abstract
Ram pressure stripping of the spiral galaxy ESO 137-001 within the highly dynamical intracluster medium (ICM) of the Norma cluster lead to spectacular extraplanar CO, optical, H, UV, and X-ray emission. The Halpha and X-ray tails extend up to 80 kpc from the galactic disk. Dynamical simulations of the ram pressure stripping event are presented to investigate the physics of the stripped gas and its ability to from stars, to predict HI maps, and to constrain the orbit of ESO 137-001 within the Norma cluster. Special care was taken for the stripping of the diffuse gas. In a new approach, we analytically estimate the mixing between the intracluster and interstellar media. Different temporal ram pressure profiles and the ICM-ISM mixing rate were tested. Three preferred models show most of the observed multi-wavelength characteristic of ESO 137-001. Our highest-ranked model best reproduces the CO emission distribution, velocity for distances <~ 20 kpc from the galactic disk, and the available NUV observations. The second and third preferred models reproduce best the available X-ray and Halpha observations of the gas tail including the Halpha velocity field. The angle between the direction of the galaxy's motion and the galactic disk is between 60 and 75 degrees. Ram pressure stripping thus occurs more face-on. The existence of a two-tail structures is a common feature in our models. It is due to the combined action of ram pressure and rotation together with the projection of the galaxy on the sky. Our modelling of the Halpha emission caused by ionization through thermal conduction is consistent with observations. HI emission distributions for the different models are predicted. Based on the 3D velocity vector derived from our dynamical model we derive a galaxy orbit, which is close to unbound.
accepted for publication in A&A. Movies for models A, B, and C can be found here: https://seafile.unistra.fr/f/d06f272d2840479aba7a/
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