Research
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2023.05.15
Mysteries of fast radio bursts
Making use of exponential increases in computing power and memory per dollar, radio astronomers have been able to search larger areas of sky with ever higher bandwidth at high time and frequency resolution. In 2007, a mysterious millisecond-duration burst was found around the cellphone band. This kind of signal is now known as fast radio burst (FRB), energetic bursts visible at a cosmological d...
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2023.05.10
Quasar Luminosity Function & Single-Epoch Black Hole Mass Estimation
Quasars, luminous extra-galactic sources powered by accreting super-massive black holes (SMBH), have become increasingly important for probing the distant universe due to the growing number of spectroscopically confirmed quasars. My research focuses on exploring the statistical properties and evolution of quasars through careful analysis of their luminosity and black hole mass. In this talk, I ...
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2023.05.07
Ultra-Diffuse Galaxies lacking dark matter: from properties to formation
The formation of ultra-diffuse galaxies (UDGs) is not well-understood. UDGs have large sizes (several kpc) for their dwarf-galaxy-like stellar mass and have a wide range in dark matter content and other observed properties. In particular, NGC1052-DF2 and NGC1052-DF4 are two puzzling UDGs: they have low-velocity dispersions indicating little to no dark matter content, as well as overly luminous ...
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2023.04.11
Binaries of the first stars as progenitors of compact object mergers
A grand challenge for modern astrophysics is to understand star and galaxy formation in the first billion years of cosmic history. In particular, the first generation of stars born in extremely metal-poor/free primordial gas, the so-called population III (Pop III), are believed to have distinct features compared with present-day stars: They are more likely to become massive black holes due thei...
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2023.04.11
21cm Cosmology in the Post-Reionization Universe
I will discuss some recent progress in 21cm line intensity mapping within the SKA cosmology science working group. In particular, we report the first direct detection of the cosmological power spectrum using 21cm line (2301.11943), derived from interferometric observations with the L-band receivers of the MeerKAT radio telescope. I review the challenges in analysing the MeerKAT data and present...
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