Mohapatra, R and Jetti, M and Sharma, P and Federrath, C (2022) Velocity structure functions in multiphase turbulence: Interpreting kinematics of Hα filaments in cool-core clusters. In: Monthly Notices of the Royal Astronomical Society, 510 (2). pp. 2327-2343.
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Abstract
The central regions of cool-core galaxy clusters harbour multiphase gas, with gas temperatures ranging from 10 to 10⁷\, \mathrmK. Feedback from active galactic nuclei jets prevents the gas from undergoing a catastrophic cooling flow. However, the exact mechanism of this feedback energy input is unknown, mainly due to the lack of velocity measurements of the hot-phase gas. However, recent observations have measured the velocity structure functions (VSFs) of the cooler molecular (∼ 10\, \mathrmK) and Hα filaments (∼ 10⁴\, \mathrmK) and used them to indirectly estimate the motions of the hot phase. In the first part of this study, we conduct high-resolution (3843-15363 resolution elements) simulations of homogeneous isotropic subsonic turbulence, without radiative cooling. We analyse the second-order velocity structure functions (VSF2) in these simulations and study the effects of varying spatial resolution, the introduction of magnetic fields, and the effect of projection along the line of sight (LOS) on it. In the second part of the study, we analyse high-resolution (7683 resolution elements) idealized simulations of multiphase turbulence in the intracluster medium from the companion study Mohapatra et al. We compare the VSF2 for both the hot (T∼ 10⁷\, \mathrmK) and cold (T∼ 10⁴\, \mathrmK) phases and find that their amplitude depends on the density contrast between the phases. They have similar scaling with separation, but introducing magnetic fields steepens the VSF2 of only the cold phase. We also find that projection along the LOS steepens the VSF2 for the hot phase and mostly flattens it for the cold phase.
| Item Type: | Journal Article |
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| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Galaxies; Magnetohydrodynamics; Numerical methods; Velocity, Cold phasis; Galaxies clusters; Galaxies: clusters: intracluster mediums; High resolution; Line of Sight; Lines-of-sight; Magnetic-field; Method: numerical; Multiphase turbulence; Velocity structure functions, Turbulence |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 27 Jun 2022 05:42 |
| Last Modified: | 27 Jun 2022 05:42 |
| URI: | https://eprints.iisc.ac.in/id/eprint/73893 |
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