RAS Research Fellowships

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RAS Research Fellowships Name Institution Research Dates Fundamental Physics with Dr Thomas Collett University of Portsmouth gravitational lensing March 2020 - March 2021 When subduction stops: understanding tectonic process in October 2018 - September Dr Amy Gilligan University of Aberdeen post-subduction settings 2021 Superluminous supernovae: a comprehensive observational & University of Edinburgh/ theoretical study of nature's October 2018 - September Dr Matt Nicholl University of Birmingham brightest fireworks 2021 Accurate Astrophysics for the Next October 2017 - September Dr Elisa Chisari University of Oxford Era of Cosmology 2020 Nature vs Nurture: the effect of Dr Joanna Eberhardt (nee stellar irradiation on atmospheric October 2016 - September Barstow) UCL evolution 2019 Explaining the Onset of Explosive Magnetic Reconnection in the in the Solar Corona & its Links to the Generation of Solar Energetic October 2016 - September Dr Peter Wyper Durham University Particles 2019 Detecting and constraining the Epoch of Reionisation using foreground removal and state-of- October 2015 - December Dr Emma Chapman Imperial College London the-art simulations 2018 Probing solar system processes March 2016 - February Dr Ben Rozitis Open University using extreme asteroids 2019 Precision cosmology of axions and October 2015 - December Dr David J E Marsh Kings College London moduli 2017 Liverpool John Moores Dr Richard Parker University The Origin of the Galactic Field March 2014 - March 2017 Royal Holloway, Deciphering the sedimentary September 2013 - August Dr John Armitage University of London record: tectonic vs climate change 2016 The Goldilocks hypothesis of planetary magnetospheres: discovering a balance between internally- and externally-driven University of Leicester / dynamics at Jupiter, Mercury and March 2013 - February Dr Sarah Badman Lancaster University Saturn 2016 University of The Dynamics of Young Star October 2012 - September Dr Nick Wright Hertfordshire Clusters 2015 Cosmology, Dark Energy Theories (Theoretical, Phenomenolgical, February 2012 - January Dr Baojiu Li University of Durham Numerical & Statistical Studies) 2015 Interaction between Exoplanets and the Winds of their Host Stars (Numerical Modelling & Magnetic October 2011 - September Dr Aline de Almeida Vidotto University of St Andrews Shield) 2014 University College London / University of Energy Release from January 2013 - December Dr Caitriona Jackman Southampton Magnetospheres 2013 University of Cambridge Mapping the Star-Forming History November 2010 - October Dr Benjamin Davies / Liverpool John Moores of Galaxies 2013 High Precision Dark Universe Cosmology with 3D Gravitational January 2011 -September Dr Thomas Kitching University of Edinburgh Lensing 2011.

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Effects of the Sources of Reionization on 21Cm Redshiftspace Distortions
Effects of the sources of reionization on 21-cm redshift-space distortions Article (Published Version) Majumdar, Suman, Jensen, Hannes, Mellema, Garrelt, Chapman, Emma, Abdalla, Filipe B, Lee, Kai-Yan, Iliev, Ilian T, Dixon, Keri L, Datta, Kanan K, Ciardi, Benedetta, Fernandez, Elizabeth R, Jelić, Vibor, Koopmans, Léon V E and Zaroubi, Saleem (2015) Effects of the sources of reionization on 21-cm redshift-space distortions. Monthly Notices of the Royal Astronomical Society, 456 (2). pp. 2080-2094. ISSN 0035-8711 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/id/eprint/69098/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher’s version. Please see the URL above for details on accessing the published version. Copyright and reuse: Sussex Research Online is a digital repository of the research output of the University. Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available. Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.
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Suman Majumdar
Suman Majumdar Contact Suman Majumdar E-mail: [email protected], Information Department of Astronomy, Astrophysics and Space Engineering [email protected] Indian Institute of Technology Indore, Voice: +91 6296136775 Indore-453552, M.P., India http://www.iiti.ac.in/people/~sumanm/ Research Cosmic Dawn and Epoch of Reionization, 21-cm Cosmology, Square Kilometre Array, Simulations of CD-EoR Interests and Large Scale Structures, N-body Simulations, Statistical Inference, Low Frequency Radio Interferometry. Education Indian Institute of Technology Kharagpur, West Bengal, India Ph.D., April, 2013 Probing the Epoch of Reionization through radio-interferometric observations of neutral hydrogen. Supervisors: Somnath Bharadwaj and Sugata Pratik Khastgir. M.Sc. in Physics, August, 2007, Performance: 1st Class. Maulana Azad College, University of Calcutta, Kolkata, West Bengal, India. B.Sc. (Honours) in Physics, August, 2005, Performance: 1st Class. Academic Assistant Professor (Tenured) May, 2018 - present Positions Department of Astronomy, Astrophysics and Space Engineering, Indore, India Indian Institute of Technology Indore Research Associate December, 2015 - April, 2018 Department of Physics, Imperial College London, UK Postdoctoral Fellow December, 2012 - November, 2015 Department of Astronomy, Stockholm University Stockholm, Sweden CSIR Senior Research Fellow May, 2011 - September, 2012 Indian Institute of Technology Kharagpur Kharagpur, India Senior Research Fellow July, 2009 - April, 2011 Indian Institute of Technology Kharagpur
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Jonathan R. Pritchard Reader in Astrostatistics
Jonathan R. Pritchard Reader in Astrostatistics Contact Imperial College Oﬃce: +44 (0)207 594 7557 Information Astrophysics Group Fax: +44 (0)207 594 7772 Blackett Laboratory Cell: +44 (0)751 841 8007 Prince Consort Road E-mail: [email protected] London WWW: http://pritchardjr.github.io SW7 2AZ UK ORCID: http://orcid.org/0000-0003-4127-5353 Biographical Date of Birth: 26 January 1980 Citizenship: British Information Research Theoretical cosmology, reionization, cosmological 21 cm line, large scale structure, cosmic microwave Interests background, inﬂation, dark energy, neutrino mass Research Imperial College, London, UK Experience Reader in Astrostatistics September, 2018 - present Senior Lecturer in Astrostatistics September, 2015 - August 2018 Lecturer in Astrostatistics October, 2011 - August, 2015 Research in cosmology, the epoch of reionization, and astrostatistics. Teaching of undergraduate physics. Supervision of MSc and PhD projects. Mentoring of postdoctoral researchers. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA ITC Fellow September, 2010 - August, 2011 Hubble Fellow September, 2007 - August, 2010 Post-doctoral research in cosmology, the epoch of reionization, and the theory of the 21 cm line. California Institute of Technology, Pasadena, California, USA Graduate Student September, 2002 - June, 2007 Ph.D. research in cosmology, CMB B-modes, and the early Universe. Cambridge University, Cambridge, UK Part III Research project December, 2001 - August, 2002 Master's level research into bound fermionic states around black holes, using a gauge theory of gravity. Advisor: Anthony Lasenby. California Institute of Technology, Pasadena, California, USA Summer Undergraduate Research Fellowship July, 2001 - September, 2001 Undergraduate level research into quintessence models for dark energy. Advisor: Marc Kamionkowski.
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Dr Emma Chapman
Dr Emma Chapman – Curriculum Vitae Work Address: Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, United Kingdom E-Mail: [email protected] Website: https://dremmachapman.wordpress.com Research Interests: Foreground mitigation; Epoch of reionisation; Cosmology; Radio interferometry and data reduction; Signal processing Career Summary Royal Society Dorothy Hodgkin Fellowship Imperial College London Oct 2018 – Present My fellowship is centred around research into the Epoch of Reionisation (EoR), contributing to its detection through membership of the LOFAR core EoR team and leading a focus group on foreground removal within the SKA working group. I supervise one PhD student, Iandeep Hothi. Royal Astronomical Society Research Fellowship Imperial College London Oct 2015 – Oct 2018 Postdoctoral Researcher University College London Dec 2013 – Oct 2015 SKA-funded postdoctoral research position, continuing personal research and contributing to the organization of the SKA EoR pipeline within the SKA SDP consortium. PhD University College London Oct 2010 – Dec 2013 Thesis title: Seeing the Light: Foreground Removal in the Dark and Dim Ages, supervised by Dr Filipe Abdalla. MPhys Durham University Oct 2006 – July 2010 Integrated masters in Theoretical Physics awarded as a First. Overall Firsts achieved in every year and every module with an overall degree percentage of 81%. Research Prizes and Major Grants 2018 Royal Society Research Enhancement Award, £97,000 2018 Royal Society Dorothy
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Chapter 6 Foregrounds and Their Mitigation
Chapter 6 Foregrounds and their mitigation1 Emma Chapman (Imperial College London) Vibor Jelic´ (Ruder Boskoviˇ c´ Institute) Abstract The low-frequency radio sky is dominated by the diffuse synchrotron emis- sion of our Galaxy and extragalactic radio sources related to Active Galactic Nuclei and star-forming galaxies. This foreground emission is much brighter than the cosmological 21 cm emission from the Cosmic Dawn and Epoch of Reionization. Studying the physical properties of the foregrounds is therefore of fundamental importance for their mitigation in the cosmological 21 cm ex- periments. This chapter gives a comprehensive overview of the foregrounds and our current state-of-the-art knowledge about their mitigation. 6.1 What are the foregrounds? A detection of the redshifted 21 cm emission from the Cosmic Dawn (CD) and Epoch of Reionization (EoR) is a daunting task due to a number of chal- lenges, which are different in nature and complexity. One of them is the extremely prominent foreground emission, which dominates the sky at low arXiv:1909.12369v1 [astro-ph.CO] 26 Sep 2019 radio frequencies. This emission intervenes like fog on an autumn morning and obscures our view towards the neutral hydrogen regions from the times of the ﬁrst “stars” in the Universe. To clear the view and to make the detec- tion possible, we need to study the foreground emission in great detail and 1To appear as a book chapter in “The Cosmic 21-cm Revolution: Charting the ﬁrst billion years of our Universe”, Ed. Andrei Mesinger (Bristol: IOP Publishing Ltd.) AAS-IOP ebooks (http://www.iopscience.org/books/aas).
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The Effect of Foreground Mitigation Strategy on Eor Window Recovery
Mon. Not. R. Astron. Soc. 000, 000–000 (0000) Printed 13 October 2018 (MN LaTEX style file v2.2) The Effect of Foreground Mitigation Strategy on EoR Window Recovery Emma Chapman,1? Saleem Zaroubi,2 Filipe B. Abdalla,3 Fred Dulwich,4 Vibor Jelić,2;5;6 Benjamin Mort4 1Department of Physics, Blackett Laboratory, Imperial College, London SW7 2AZ, UK 2Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 700AV, Groningen, the Netherlands 3Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT 4Oxford e-Research Centre, University of Oxford, Keble Rd, Oxford, UK, OX1 3QG 5ASTRON - the Netherlands Institute for Radio Astronomy, PO Box 2, 7990 AA Dwingeloo, the Netherlands 6Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia 13 October 2018 ABSTRACT The removal of the Galactic and extragalactic foregrounds remains a major challenge for those wishing to make a detection of the Epoch of Reionization 21-cm signal. Mul- tiple methods of modelling these foregrounds with varying levels of assumption have been trialled and shown promising recoveries on simulated data. Recently however there has been increased discussion of using the expected shape of the foregrounds in Fourier space to define an EoR window free of foreground contamination. By carrying out analysis within this window only, one can avoid the foregrounds and any statis- tical bias they might introduce by instead removing these foregrounds. In this paper we discuss the advantages and disadvantages of both foreground removal and fore- ground avoidance. We create a series of simulations with noise levels in line with both current and future experiments and compare the recovered statistical cosmological signal from foreground avoidance and a simplified, frequency independent foreground removal model.
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Thesis Prize Winners the Michael Penston and Keith Runcorn (Formerly the Blackwell) Thesis Prizes Are Awarded for the Best Docto
Thesis Prize Winners The Michael Penston and Keith Runcorn (formerly the Blackwell) Thesis Prizes are awarded for the best doctoral thesis in astronomy or geophysics respectively. Year Michael Penston Thesis Prize Keith Runcorn Thesis Prize (Astronomy) (Geophysics) 2017 2016 Dr Justin Alsing (Imperial) Dr Rishy Mistry (Imperial) Bayesian analysis of weak lensing Magnetic reconnection exhausts in the solar wind. Runners up: Dr Antonia Bevan (UCL) Dust- Affected Models of Characteristic Line Runner up: Dr Robert Green (Cambridge) Emission in Supernovae The structure and seismicity of Icelandic Dr Tom Louden (Warwick) The composition rifts and dynamics of exoplanet atmospheres 2015 Dr Matt Nicholl (Queen’s University Dr Matteo Ravasi (University of Belfast) Edinburgh) Observations and modelling of super- Reciprocity-based imaging using multiply luminous supernovae scattered waves Runner up: Dr Alexandre Barreira (Durham Runner up: Dr Callum Shakespeare University) (University of Cambridge – now Structure formation in modified gravity Australian National University) cosmologies On the generation of waves during frontogenesis 2014 Dr Guido Pettinari (University of Sussex) Dr Hannah Christensen (née Arnold) The intrinsic bispectrum of the Cosmic (University of Oxford) Microwave Background Stochastic Parametrisation and Model Uncertainty Joint runners up: Dr David Harvey Runner up: Dr Grace Nield (Newcastle (University of Edinburgh - now at Ecole University) Polytechnique Federal de Lausanne) and Dr The Effect of Late Holocene Ice-Mass Boris
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Advancing Astrophysics with the Square Kilometre Array
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Radioastronomers Take Aim at the Universe's First Billion Years
INTO THE DARK AGES Radioastronomers take aim at the Universe’s first billion years. BY DAVIDE CASTELVECCHI o get an idea of what the Universe looks time when the Universe was just one-thirtieth like from Earth’s perspective, picture a big of its current age of 13.8 billion years. Beyond T watermelon. Our Galaxy, the Milky Way, is those, at the thin, green outer layer of the water- one of the seeds, at the centre of the fruit. The melon skin, lies something primeval from space around it, the pink flesh, is sprinkled with before the time of stars. This layer represents countless other seeds. Those are also galaxies the Universe when it was a mere 380,000 years that we — living inside that central seed — can old, and still a warm, glowing soup of sub atomic observe through our telescopes. particles. We know about that period because its Because light travels at a finite speed, we see light still ripples through space — although it other galaxies as they were in the past. The seeds has stretched so much over the eons that it now farthest from the centre of the watermelon are exists as a faint glow of microwave radiation. the earliest galaxies seen so far, dating back to a The most mysterious part of the observable 298 | NATURE | VOL 572 | 15 AUGUST 2019 ©2019 Spri nger Nature Li mited. All ri ghts reserved. ©2019 Spri nger Nature Li mited. All ri ghts reserved. FEATURE NEWS A night view of part Universe is another electromagnetic frequency and so a rather long years ago, this afterglow of the Big Bang would of the Murchison layer of the water- wavelength, of slightly more than 21 cm.
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Part 6 Foreground Mitigation
Part 6 Foreground mitigation Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.19, on 26 Sep 2021 at 23:31:39, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S1743921317010419 Peering towards Cosmic Dawn Proceedings IAU Symposium No. 333, 2018 c International Astronomical Union 2018 V. Jelić & T. van der Hulst, eds. doi:10.1017/S1743921317010419 Foreground Mitigation in the Epoch of Reionization Emma Chapman Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London, SW7 2AZ, United Kingdom email: [email protected] Abstract. The EoR foregrounds can be up to three magnitudes greater than the cosmolog- ical signal we wish to detect. Multiple methods have been developed in order to extract the cosmological signal, falling roughly into three categories: foreground removal, foreground sup- pression and foreground avoidance. These main approaches are briefly discussed in this review and consideration taken to the future application of these methods as a multi-layered approach. Keywords. methods: data analysis, methods: statistical, telescopes, radio continuum: general, cosmology: observations, (cosmology:) early universe 1. Introduction The first direct detection of the Epoch of Reionization is a challenge on many fronts, not least of them the removal of the foregrounds. The astrophysical foregrounds in an EoR ex- periment are expected to consist of bright compact sources, diffuse Galactic Synchrotron, diffuse Galactic free-free and extragalactic foregrounds. While other foregrounds such as radio recombination lines (e.g. Gleser, Nusser & Benson. (2008)) and RFI (e.g. Offringa, van de Gronde & Roerdink (2012)) of course exist they are thought to be easily identifi- able and removable and are not dealt with under the umbrella of foreground mitigation methods.
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Dr Emma Chapman – Curriculum Vitae
Dr Emma Chapman – Curriculum Vitae Work Address: Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, United Kingdom E-Mail: [email protected] Website: https://dr-emma-chapman.com Research Interests: Foreground mitigation; Epoch of reionisation; Cosmology; Radio interferometry and data reduction; Signal processing Career Summary Royal Society Dorothy Hodgkin Fellowship Imperial College London Oct 2018 – Present My fellowship is centred around research into the Epoch of Reionisation (EoR), contributing to its detection through membership of the LOFAR core EoR team and leading a focus group on foreground removal within the SKA working group. I supervise two PhD students. Science Communication Author Freelance I am a popular science writer and have produced articles in popular magazines such as The I Paper, The Big Issue, Astronomy Now. “First Light”, my first popular science book, was published by Bloomsbury in November 2020 to great acclaim. Co-director of The 1752 Group Jan 2017 – Apr 2021 Lead of Media, Campaigns and Advocacy in the 1752 Group (www.1752group.com), a research and activist organisation tackling sexual misconduct in higher education via. evidence-based policy change. Royal Astronomical Society Research Fellowship Imperial College London Oct 2015 – Oct 2018 Postdoctoral Researcher University College London Dec 2013 – Oct 2015 SKA-funded postdoctoral research position, continuing personal research and contributing to the organization of the SKA EoR pipeline within the SKA SDP consortium. PhD University College London Oct 2010 – Dec 2013 Thesis title: Seeing the Light: Foreground Removal in the Dark and Dim Ages. MPhys Durham University Oct 2006 – July 2010 Integrated masters in Theoretical Physics awarded as a First.
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