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2024.03.08

Pathway to high-z SMBHs: seed formation and growth in the statistical perspective

<p>The early evolution of the black hole mass function (BHMF) and quasar luminosity function (QLF) encodes key information on the physics determining the radiative and accretion processes of black holes (BHs) growing in high-redshift galaxies. Starting from the formation of seed BHs as their parent halos evolve, we study primordial gas collapse in the biased quasar host halos, computing gas chemic...</p>

2024.02.28

Weak Lensing Without Shape Noise

<p>Weak gravitational lensing imprints a coherent distortion onto the observed shapes of distant galaxies. At the image level, this gravitational shear degenerates with the intrinsic shape of galaxies, and the weak lensing signal-to-noise from an individual galaxy is of order 0.01. I will describe Kinematic Lensing, a new technique combining imaging and galaxy kinematics to measure weak lensing wi...</p>

2024.06.20

Towards a Unified Story for Planet Formation

<p>While the exoplanetary field is replete with remarkable discoveries, perhaps the two most intriguing findings have been the detection of hot Jupiters – giant planets orbiting perilously close to their parent stars, and the startling abundance of super-Earths. The mere existence of these worlds was wholly unpredicted based on the expectations that were gleaned from centuries of observation of o...</p>

2024.06.13

Weak lensing cosmology beyond two-point shear correlations

<p>With the fast development of high-precision large photometric surveys, weak lensing (WL) effects have become one of the major probes in cosmology. While the two-point shear correlations are the most extensively employed analyses, other statistics beyond that are desired because of the non-Gaussian nature of cosmic structures. In this presentation, I will discuss the cosmological application of ...</p>

2024.06.06

From Subaru to WFST: The Past, Present, and Future of Fast Transient Studies

<p>Transients with fast brightness variance in UV/optical wavelengths (&quot;fast transients,&quot; such as early-phase supernovae, fast blue optical transients, kilonovae) are of great interest in astronomy. Although great progresses in time-domain astronomy have been made via wide, shallow, and day(s)-cadence surveys, the limited observing depth and low time resolution make traditional time-domain surveys...</p>

2024.05.30

New windows in X-ray astronomy opened by eROSITA all-sky surveys

<p>30 years after the ROSAT all-sky survey (1990), eROSITA performed X-ray all-sky surveys again in 2020-2022, in which 90% of the sky was observed in the X-ray band with high resolution for the first time. The eROSITA all-sky surveys (eRASSs) will detect millions of AGNs and tens of thousands of galaxy clusters and open a large space of discoveries. I will introduce eRASS and three research topic...</p>

2024.05.23

Precision studies of galaxy formation and cosmology

<p>I will introduce some of our recent work focused on the measurement and modeling of galaxy distribution. We have developed a new method called PAC to make use of the complementary information from redshift and photometric galaxy surveys. With this method, we are able to significantly improve the measurements of some important observational quantities such as the galaxy stellar mass function and...</p>

2024.05.16

Observations and 3D MHD simulations of magnetic reconnection

<p>Magnetic reconnection is a fundamental physical process in various astrophysical, space, and laboratory environments. In solar physics, it is even believed to be a key mechanism to heat/accelerate plasmas and drive the eruption of large-scale magnetic field, giving rise to coronal mass ejections and flares, as well as solar energetic particles. High-cadence and high-resolution observations rece...</p>

2024.05.09

The sample and mass loss rate of red supergiants in M31 and M33

<p>Red supergiants &nbsp;are important contributors to interstellar medium through massive wind. Due to serious interstellar extinction, the complete sample of RSGs is extremely difficult to obtain in our Galaxy. As &nbsp;two of the largest spiral galaxies in the Local Group, M31 and M33 can serve as a reference to analyze the global contribution of RSGs to the galactic medium. By using evident branching of...</p>

2024.04.25

Recent developments in the theory of planet migration

<p>The migration of planets, through the exchange of angular momentum with the protoplanetary discs in which they form, is likely to be important during planet formation. Evidence for migration is provided by systems of multiple exoplanets in which the planets are in mean motion resonances, and by the orbital configurations of circumbinary planets. However, attempts to reproduce the known populati...</p>