University of Groningen
Nowhere to hide: identifying AGN in the faint radio sky
Radcliffe, Jack Frederick
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Publication date:
2019
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Radcliffe, J. F. (2019). Nowhere to hide: identifying AGN in the faint radio sky. University of Groningen.
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Stellingen
behorende bij het proefschrift
N
OWHERE TOH
IDE:
IDENTIFYINGAGNIN THE FAINT RADIO SKY
door
Jack F. R
ADCLIFFE1. Multi-source self-calibration permits observations of faint sub-mJy radio sources located in ‘blank’ fields, using VLBI arrays. The associated images present en-hanced image fidelity and r.m.s. noise levels that approach theoretical limits
(Chap-ter 2).
2. Observations encompassing the entire primary beam of the European VLBI Net-work are possible now, due to the development of multi-source self-calibration and primary beam correction codes (Chapters 2 & 3).
3. Singular multi-wavelength AGN classification techniques cannot identify all VLBI-selected AGN, but combinations of classification techniques can. This reinforces the view that VLBI is a valuable and inexpensive tool that is able to directly classify AGN in many fields where deep multi-wavelength data are absent (Chapter 4). 4. The majority of X-ray selected AGN present radio emission which is related to the
host galaxy, rather than a central AGN (Chapter 4).
5. Only a few per cent of the persistent sub-mJy radio source population are variable, thus continuing the trend reported by earlier studies of the mJy sky (Chapter 5). 6. Future radio surveys will revolutionise our understanding of the Universe,
how-ever, significant focus must also lie on increasing their spatial resolution in order to reveal the inner workings of distant galaxies.
7. The current Ph.D. and academic work environment must change in order to stem the rising number of mental health issues.
8. The notion of open science should be adopted by all academic journals. Each re-sult published should be accompanied by the codes which generated the rere-sult, in order to ensure that mistakes are found and biases are reduced.
9. Education along with equal opportunities for all people of diverse backgrounds is key to achieving future scientific discoveries.
Deze stellingen worden opponeerbaar en verdedigbaar geacht en zijn als zodanig goedgekeurd door de promotores prof. dr. P. D. Barthel en prof. dr. M. A. Garrett.
