University of Groningen
Non-thermal emission and magnetic fields in nearby galaxies Seethapuram Sridhar, Sarrvesh
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Publication date: 2018
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Seethapuram Sridhar, S. (2018). Non-thermal emission and magnetic fields in nearby galaxies: A low-frequency radio continuum perspective. University of Groningen.
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Propositions
accompanying the dissertation
Non-thermal emission and magnetic fields in nearby
galaxies: A low-frequency radio
continuum perspective.
by
Sarrvesh Seethapuram Sridhar
1. Low-radio frequency observations of nearby galaxies are crucial for study-ing magnetic fields at large galactocentric radii. (Chapters 2, 3, & 4) 2. The anomalous arms in NGC 4258 have an hybrid morphology where the inner arms are embedded in the disk and the outer arm on the eastern side is located in front of the disk. (Chapter 2) 3. Integrated flux densities of nearby galaxies reported in the literature are of-ten overestimated due to source confusion. Multiwavelength data products with high angular resolution are needed to identify confusing background
radio sources. (Chapter 2 & 3)
4. Radio observations of starburst dwarf galaxies are vital for understanding magnetisation of the universe. (Chapter 4) 5. Giant HIIregions are dominated by thermal emission even at meter
wave-lengths. (Chapters 3 & 4)
6. The format of widely used multidimensional astronomical data sets does not always allow fast data processing. Fortunately, minor changes to the format can significantly increase the processing speed. (Chapter 5) 7. Radio astronomers should always pay close attention to the outcomes of calibration and imaging pipelines and verify the results, especially in the era of big data (radio) astronomy where science-ready data products will be the new norm.
8. Legalisation is better than prohibition.
9. Statements made by public personnel ought to be judged based on their own merit and not based on the political/religious affiliations of the individual. 10. Dissent and criticism are integral parts of a democratic society.
