Investigating the intracluster medium viscosity using the tails of GASP jellyfish galaxies
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909383960559616 |
|---|---|
| author | Ignesti, Alessandro Brunetti, Gianfranco Gullieuszik, Marco Akerman, Nina Marasco, Antonino Poggianti, Bianca M. Li, Yuan Vulcani, Benedetta Gitti, Myriam Moretti, Alessia Giunchi, Eric Tomičić, Neven Bacchini, Cecilia Paladino, Rosita Radovich, Mario Wolter, Anna |
| author_facet | Ignesti, Alessandro Brunetti, Gianfranco Gullieuszik, Marco Akerman, Nina Marasco, Antonino Poggianti, Bianca M. Li, Yuan Vulcani, Benedetta Gitti, Myriam Moretti, Alessia Giunchi, Eric Tomičić, Neven Bacchini, Cecilia Paladino, Rosita Radovich, Mario Wolter, Anna |
| contents | The microphysics of the intracluster medium (ICM) in galaxy clusters is still poorly understood. Observational evidence suggests that the effective viscosity is suppressed by plasma instabilities that reduce the mean free path of particles. Measuring the effective viscosity of the ICM is crucial to understanding the processes that govern its physics on small scales. The trails of ionized interstellar medium left behind by the so-called jellyfish galaxies can trace the turbulent motions of the surrounding ICM and constrain its local viscosity. We present the results of a systematic analysis of the velocity structure function (VSF) of the H$α$ line for ten galaxies from the GASP sample. The VSFs show a sub-linear power law scaling below 10 kpc which may result from turbulent cascading and extends to 1 kpc, below the supposed ICM dissipation scales of tens of kpc expected in a fluid described by Coulomb collisions. Our result constrains the local ICM viscosity to be 0.3-25$\%$ of the expected Spitzer value. Our findings demonstrate that either the ICM particles have a smaller mean free path than expected in a regime defined by Coulomb collisions, or that we are probing effects due to collisionless physics in the ICM turbulence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_07034 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Investigating the intracluster medium viscosity using the tails of GASP jellyfish galaxies Ignesti, Alessandro Brunetti, Gianfranco Gullieuszik, Marco Akerman, Nina Marasco, Antonino Poggianti, Bianca M. Li, Yuan Vulcani, Benedetta Gitti, Myriam Moretti, Alessia Giunchi, Eric Tomičić, Neven Bacchini, Cecilia Paladino, Rosita Radovich, Mario Wolter, Anna Cosmology and Nongalactic Astrophysics The microphysics of the intracluster medium (ICM) in galaxy clusters is still poorly understood. Observational evidence suggests that the effective viscosity is suppressed by plasma instabilities that reduce the mean free path of particles. Measuring the effective viscosity of the ICM is crucial to understanding the processes that govern its physics on small scales. The trails of ionized interstellar medium left behind by the so-called jellyfish galaxies can trace the turbulent motions of the surrounding ICM and constrain its local viscosity. We present the results of a systematic analysis of the velocity structure function (VSF) of the H$α$ line for ten galaxies from the GASP sample. The VSFs show a sub-linear power law scaling below 10 kpc which may result from turbulent cascading and extends to 1 kpc, below the supposed ICM dissipation scales of tens of kpc expected in a fluid described by Coulomb collisions. Our result constrains the local ICM viscosity to be 0.3-25$\%$ of the expected Spitzer value. Our findings demonstrate that either the ICM particles have a smaller mean free path than expected in a regime defined by Coulomb collisions, or that we are probing effects due to collisionless physics in the ICM turbulence. |
| title | Investigating the intracluster medium viscosity using the tails of GASP jellyfish galaxies |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2411.07034 |