News and Events
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Morphology of cosmological fields during the epoch of Reionization
Mon 22nd July, 2019 @3:15 PM, level 6, David Caro Building Akanksha Kapahtia, Indian Institute of Astrophysics Email: akanksha.kapahtia@iiap.res.in Abstract Neutral hydrogen is the dominant component of the universe after recombination with high density regions harbouring the first luminous objects. The radiation from these first luminous objects changes the thermal and ionization state of the intergalactic medium leading to a major transition in the …
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Interferometric Imaging with PURIFY: Real Observations + Wide-field Corrections
Thurs 4 July, 2019 @12:00 PM, level 6, David Caro Building Luke Pratley, Mullard Space Science Laboratory, University College London Email: luke.pratley@gmail.com Abstract The standard methods in radio interferometry for reconstructing images, such as CLEAN and its variants, have served the community well over the last few decades and have survived largely because they are pragmatic. However, they produce reconstructed interferometric images that are …
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Exploiting non-Gaussian information to better understand the first stars and galaxies
Wed 3 July, 2019 @2:15 PM, level 7, David Caro Building Dr Catherine Watkinson, Imperial College London Email: c.watkinson11[at]imperial.ac.uk Abstract The SKA and HERA are expected to detect the 21cm line of neutral hydrogen from the high-z Universe with great precision. This should allow us to learn about early generations of stars and galaxies, as we observe the impact of their radiation through ionisations …
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Bayesian Model Selection with Future 21cm Observations of The Epoch of Reionisation
Wed 26th June, 2019 @14:15 PM, level 7, David Caro Building Tom Binnie, Imperial College London, UK Email: t.binnie16@imperial.ac.uk Abstract We apply Bayesian statistics to perform model selection on different reionisation scenarios via the Multinest algorithm. Initially, we recover the results shown by 21CMMC for the parameter estimation of 21cmFAST models. We proceed to test several toy models of the Epoch of Reionisation (EoR) …
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Precision timing and scintillation of binary radio pulsars
Wed 12th June 2019 @14:15 PM, level 6, David Caro Building, Dr. Daniel Reardon, Swinburne University, Email: dreardon@swin.edu.au Abstract Radio pulsars are precise clocks that can be timed using a detailed model of the pulsar, its binary orbit, and the ionised interstellar medium along our line of sight. This timing model can be used to test theories of dense matter, gravity in the strong …
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To Illuminate the Dark Ages
Wed 5th June, 2019 @14:15 PM, level 7, David Caro Building Dr Yuxiang Qin, Scuola Normale Superiore, Pisa Email: yuxiang.qin@sns.it Abstract The measurement of the cosmic 21-cm signal with the SKA will transform our understanding of the epochs of reionization and cosmic dawn. The properties of the first stars and galaxies are encoded in the patterns of the signal. Interpreting these patterns requires accurate …
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The Evolution of Super-massive Black Holes from Broadband Radio Surveys
Wed 29 May, 2019 @14:15 PM, level 7, David Caro Building Dr Nick Seymour, Curtin University Email: nick.seymour[at]curtin.edu.au Abstract Radio surveys are unique probes of accreting super-massive black holes. Curiously, powerful radio emission is associated with both high and low accretion rates. Broadband radio surveys covering many decades of frequency allow us to select specific radio-loud sources as well as to characterise their jet …
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ZFOURGE & MOSEL : Emergent Galaxies at z~3.5
Wed 15 May, 2019 @14:15 PM, level 7, David Caro Building Dr Kim-Vy Tran, UNSW Email: kimvy.tran[at]gmail.com Abstract ZFOURGE and MOSEL are deep observational surveys that track how galaxies assemble over cosmic time. ZFOURGE identifies approximately 70,000 objects up to redshifts of z~7 using a custom set of near-infrared imaging filters that provide high precision photometric redshifts. MOSEL targets emergent galaxies from ZFOURGE for …
A list of recent colloquia, with slides in some cases, can be found here.