Research
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2023.12.15
Bridging the gap between luminous red novae and common envelope evolution with radiation hydrodynamic models
Luminous red novae (LRNe) are relatively new transients that have the luminosity between classic novae and supernovae, initially classified as "gap transients". Even though many more "gap transients" have been observed by telescopes such as ZTF and Keck, their origin and physical processes remain mysterious. To initiate the study of the nature of LRNe, I built a 1D and 2D radiation hydrodynamic...
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2023.12.18
Electromagnetic fireworks from erupting magnetars
Highly magnetized neutron stars are a source of extreme transients observed in different bands, like the fast radio burst (FRB) and associated hard X-ray burst from the Galactic magnetar SGR 1935+2154. The origin of such outbursts, hard X-rays on the one hand and millisecond duration FRBs on the other hand, is still unknown. We present a global model for various kinds of such magnetar outbursti...
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2023.12.12
Cross-correlation between the Thermal Sunyaev–Zeldovich Effect and the Integrated Sachs–Wolfe Effect
Understanding the composition and distribution of baryonic matter in the Universe is a crucial step toward unraveling the mysteries of its formation and evolution. Early estimates and numerical simulations show that most baryons are “missing,” whereas the baryons that are already made into stars and galaxies constitute a small portion of the total baryon budget. Therefore accurate constraints...
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2023.12.05
Reconstruction of Cosmological Initial Density Field with Observations from the Epoch of Reionization
Initial density distribution provides a basis for understanding the complete evolution of cosmological density fluctuations. While reconstruction in our local Universe exploits the observations of galaxy surveys with large volumes, observations of high-redshift galaxies are performed with a small field of view and therefore can hardly be used for reconstruction. Here we propose to reconstruct t...
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2023.12.26
The “Missing baryons” in the cosmic web—what is it? Where is it? How much?
Previous studies of galaxy formation have shown that only 10 per cent of the cosmic baryons are in stars and galaxies, while 90 per cent of them are missing. In this talk, I will present several observational studies that coherently find significant evidences of the missing baryons. The first measurement is the cross-correlation between the thermal Sunyaev-Zeldovich effect with gravitational le...
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