Joshiwa van Marrewijk
PhD Student at ESO
I feel privileged that I enjoy what I study. Astronomy is my passion. My studies enable me to combine my hobbies, like programming, with abstract complex concepts such as the origins and evolution of the Universe. In my free time, I enjoy listening to music and reading books. Some of my favorite authors are J.R.R. Tolkien, Arjen van Veelen, and Ilja Leonard Pfeijffer.
Furthermore, I like to play baseball and football or go surfing when the weather permits it. I enjoy delivering qualitative work by my metric. In life, I consider myself to be enthusiastic and driven yet full of doubt. Strong opinions held loosely; I love that.
Astronomy's pursuit of understanding the Universe's content and growth stands as a fundamental research domain. Addressing these open questions often involves extensive hydrodynamical simulations that can track the cosmic web's evolution over time. However observationally, capturing a snapshot of the formation of large-scale structures has proven challenging and making a direct comparison between simulations and reality hard to interpret. In my research, I push observations on the most massive objects in their respective epochs to higher redshifts to better constrain their evolutionary pathways. During my Ph.D., I specialized in using ALMA to retrieve the characteristics of early-formed structures like the first galaxies and proto-clusters.
For me, every paper is a new opportunity to code something up. Hence, over the years, I have developed new techniques that help me retrieve relevant scientific information from complex data sets. For instance, I have experimented with utilizing a Bayesian-forward modeling routine to deconvolve interferometric data from the Atacama Large Millimeter/submillimeter Array (ALMA) of the Sunyaev-Zel'dovich effect to better recover extended scales.
To study the first galaxies and proto-clusters, I typically use telescopes such as ALMA and the Atacama Cosmology Telescope (ACT). For the latter (as well as Simon's Observatory), I am an official junior member of the corresponding large collaboration. I am grateful to be supervised by T. Mroczkowski and G. Popping.
Before I joined ESO, I studied in Leiden for six years. I obtained my two bachelors in Astronomy and Physics, and I specialized in Astronomical Research during my master's. While in Leiden, I worked with J. Hodge, M. Rybak, S. Debackere, and H. Hoekstra.