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19 April 2024 |
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Article overview
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Probing magnetic fields with Square Kilometre array and its precursors | | Subhashis Roy
; Sharanya Sur
; Kandaswamy Subramanian
; Arun Mangalam
; TR Seshadri
; Hum Chand
; | | Date: |
21 Nov 2016 | | Abstract: | Origin of magnetic fields, its structure and effects on dynamical processes
in stars to galaxies are not well understood. Lack of a direct probe has
hampered its study. The first phase of Square Kilometre Array (SKA-I), will
have more than an order of magnitude higher sensitivity than existing radio
telescopes. In this contribution, we discuss specific science cases that are of
interest to the Indian community concerned with astrophysical turbulence and
magnetic fields. The SKA-I will allow observations of a large number of
background sources with detectable polarisation and measure their Faraday
depths (FDs) through the Milky Way, other galaxies and their circum-galactic
medium. This will probe line-of-sight magnetic fields in these objects well and
provide field configurations. Detailed comparison of observational data with
models which consider various processes giving rise to field amplification and
maintenance will then be possible. Such observations will also provide the
coherence scale of the fields and measure its random component. Measuring the
random component is important to characterise turbulence in the medium.
Observations of FDs with redshift will provide important information on
magnetic field evolution as a function of redshift. The background sources
could also be used to probe magnetic fields and its coherent scale in galaxy
clusters and in bridges formed between interacting galaxies. Other than FDs,
sensitive observations of synchrotron emission from galaxies will provide
complimentary information on their magnetic field strengths in the sky plane.
The core shift measurements of AGNs can provide more precise measurements of
magnetic field very close (<pc) to the black hole and its evolution. The low
band of SKA-I will also be useful to study circularly polarized emission from
Sun and comparing various models of field configurations with observations. | | Source: | arXiv, 1611.6966 | | Services: | Forum | Review | PDF | Favorites | |
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