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2023.12.07

On the Cosmic Baryon Cycle---Insights Learned from the Cosmic Ultraviolet Baryon Survey (CUBS)

<p>The circumgalactic medium (CGM) contains the fuel for future star formation and the record of past feedback, making it uniquely sensitive to the physics of baryonic flows. Characterizing the tenuous multiphase CGM across cosmic time holds a key to unveiling the drivers of galaxy growth. The Cosmic Ultraviolet Baryon Survey (CUBS) is designed to map intergalactic and circumgalactic gas at interm...</p>

2023.11.30

Exploring the blinking universe with FAST

<p>Fast radio bursts (FRBs) are the brightest millisecond-duration-astronomical transients in radio bands with yet unknown origin. I will briefly review the development process of the field of fast radio bursts and introduce how we use FAST to study fast radio bursts. We reveal systematic frequency evolution of repeating FRBs, namely depolarization toward lower frequencies, which can be well descr...</p>

2023.11.23

Astrochemistry: from the interstellar medium to the cradle of life

<p>Who are we? Where do we come from?With the enhanced capabilities of modern radio and infrared telescopes, astrochemistry has experienced a remarkable surge in detecting molecules within the Interstellar Medium (ISM). Some of these identified species hold prebiotic significance. The origins, activation, and storage of these molecules within the ISM remain a mystery. How, when, and where these co...</p>

2023.11.16

Probing cosmic dawn from the ground to the lunar orbit

<p>Various 21 cm signals from neutral hydrogen have been proposed to probe the cosmic dawn, including the global 21 cm spectrum, the 21 cm tomography, and the 21 cm forest. They will provide valuable insights into the early structure formation during the cosmic dawn, and have been identified as the key scientific goals for a number of ground-based and space-borne radio experiments, including the i...</p>

2023.11.09

Like a wrecking ball: understanding giant planets as the key to finding Earths

<p>Jupiter-like planets are the key to understanding Earth-like planets. Their presence can disrupt the orbits of inner habitable worlds, or deliver life-sustaining water. While the search for Earth-like planets orbiting nearby stars garners the most attention, it is critically important to understand the presence and properties of giant planets in those systems. In the next decade, three space mi...</p>

2023.11.02

Feeding and Feedback of Low-luminosity AGNs

<p>Supermassive black holes (SMBHs) spend most of their lifetime accreting at a rate well below the Eddington limit, manifesting themselves as low-luminosity active galactic nuclei (LLAGNs). The prevalence of a hot wind from LLAGNs is a generic prediction by theories and numerical simulations of black hole accretion and has recently become a crucial ingredient of AGN kinetic feedback in cosmologic...</p>

2023.10.19

Radio observations of fast variations in microquasars

<p>Microquasars are the compact objects generally including accreting black holes which produce relativitic jets. The physical mechanisms of jet launching, collimation, and acceleration are poorly understood. Microquasars show strong variability in multi-wavelength observations. In X-rays, the sources show the fast variation features up to millisecond time scales, with the prominant quasiperiodic ...</p>

2023.10.12

Formation of Merging Compact Binaries

<p>The recent breakthrough in the detection of gravitational waves (GWs) from merging black hole (BH) and neutron star (NS) binaries by advanced LIGO/Virgo has generated renewed interest in understanding the formation mechanisms of merging compact binaries, from the evolution of massive stellar binaries and triples in the galactic fields, dynamical interactions in dense star clusters to binary mer...</p>

2023.09.28

Cosmic neutrinos: a new window into the extreme Universe

<p>In 2013, the IceCube Neutrino Observatory at the South Pole discovered an extragalactic high-energy diffuse neutrino flux, opening a new era for neutrino astronomy. However, the origin of this flux remains mostly unresolved to date. Identification of astrophysical neutrino sources would be the smoking evidence to unveil the century-long puzzle on origin of cosmic rays. Being neutral and interac...</p>

2023.09.21

Thermal convection in rapidly rotating oblate spheroidal planets

<p>Motivated by its applications to the interior dynamics of planets, the problem of thermal convection in rapidly rotating, self-gravitating fluid bodies has been widely modeled in spheres or spherical shells, which implicitly neglects the flattening effect due to the centrifugal force. However, recent Juno and Cassini missions have measured the gravitational fields of Jupiter and Saturn with ext...</p>