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Constraining the Milky Way Mass Profile with Phase-Space Distribution of Satellite Galaxies
Zhao-Zhou Li, Yong-Zhong Qian, Jiaxin Han +3
We estimate the Milky Way (MW) halo properties using satellite kinematic data including the latest measurements from Gaia DR2. With a simulation-based 6D phase-space distribution f…
Neutrino Production Associated with Late Bumps in Gamma-Ray Bursts and Potential Contribution to Diffuse Flux at IceCube
Gang Guo, Yong-Zhong Qian, Meng-Ru Wu
IceCube has detected many TeV--PeV neutrinos, but their astrophysical origins remain largely unknown. Motivated by the observed late-time X-ray/optical bumps in some gamma-ray burs…
A Versatile and Accurate Method for Halo Mass Determination from Phase-Space Distribution of Satellite Galaxies
Zhao-Zhou Li, Yong-Zhong Qian, Jiaxin Han +2
We propose a versatile and accurate method to estimate the halo mass and concentration from the kinematics of satellite galaxies. We construct the 6D phase-space distribution funct…
Presupernova neutrino signals as potential probes of neutrino mass hierarchy
Gang Guo, Yong-Zhong Qian, Alexander Heger
We assess the potential of using presupernova neutrino signals at the Jiangmen Underground Neutrino Observatory (JUNO) to probe the yet-unknown neutrino mass hierarchy. Using model…
New \textsl{s}-process Mechanism in Rapidly-Rotating Massive Pop II Stars
Projjwal Banerjee, Alexander Heger, Yong-Zhong Qian
We report a new mechanism for the \textsl{s} in rotating massive metal-poor stars. Our models show that above a critical rotation speed, such stars evolve in a quasi-chemically-hom…
Rate of dark photon emission from electron positron annihilation in massive stars
Ermal Rrapaj, Andre Sieverding, Yong-Zhong Qian
We calculate the rate of production of dark photons from electron-positron pair annihilation in hot and dense matter characteristic of supernova progenitors. Given the non-linear d…