39 citations · 88 across the 13 of their papers we have counts for
13 papers
Does the high-energy AMS-02 positron flux originate from the dark matter density spikes around nearby black holes?
Man Ho Chan, Chak Man Lee
Recent measurements made by the Alpha Magnetic Spectrometer (AMS) have detected accurate positron flux for energy range 1-1000 GeV. The energy spectrum can be best described by two…
Identifying dark matter signals by the radio continuum spectral data of the cool-core cluster RX J1720.1+2638
Man Ho Chan, Chak Man Lee
Investigating the signals of dark matter annihilation is one of the most popular ways to understand the nature of dark matter. In particular, many recent studies are focussing on u…
What if PSR J1910-5959A is an observable self-lensing binary?
Man Ho Chan, Chak Man Lee
In a binary, when the orbital plane of the companion star is almost edge-on along the line-of-sight direction, this would produce an observable self-gravitational lensing effect, w…
A new method to constrain annihilating dark matter
Man Ho Chan, Chak Man Lee
Recent indirect searches of dark matter using gamma-ray, radio, and cosmic-ray data have provided some stringent constraints on annihilating dark matter. In this article, we propos…
Crossing the dark matter soliton core: a possible reversed orbital precession
Man Ho Chan, Chak Man Lee
The ultra-light dark matter (ULDM) model has become a popular dark matter scenario nowadays. The mass of the ULDM particles is extremely small so that they can exhibit wave propert…
The solar system test for the general modified gravity theories
Man Ho Chan, Chak Man Lee
In the past few decades, various versions of modified gravity theories were proposed to mimic the effect of dark matter. Compared with the conventional Newtonian or relativistic dy…
Investigating the nature of mass distribution surrounding the Galactic supermassive black hole
Man Ho Chan, Chak Man Lee, Chi Wai Yu
In the past three decades, many stars orbiting about the supermassive black hole (SMBH) at the Galactic Centre (Sgr A*) were identified. Their orbital nature can give stringent con…
Constraining annihilating dark matter by radio continuum spectrum of the Large Magellanic Cloud
Man Ho Chan, Chak Man Lee
Recent radio observations have obtained stringent constraints for annihilating dark matter. In this article, we use the radio continuum spectral data of the Large Magellanic Cloud…
Constraints on annihilating dark matter in the Omega Centauri cluster
Man Ho Chan, Chak Man Lee
Recent gamma-ray and radio studies have obtained some stringent constraints on annihilating dark matter properties. However, only a few studies have focussed on using X-ray data to…
The evaporating primordial black hole fraction in cool-core galaxy clusters
Chak Man Lee, Man Ho Chan
Recent studies of gamma-ray, cosmic-ray and radio data put stringent constraints on the fraction of primordial black holes (PBHs) in our universe. In this article, we propose a new…
Constraining Primordial Black Hole Fraction at the Galactic Centre using radio observational data
Man Ho Chan, Chak Man Lee
Recent gamma-ray and cosmic-ray observations have put strong constraints on the amount of primordial black holes (PBHs) in our universe. In this article, we use the archival radio…
Constraining the population of intermediate mass black holes by gamma-ray data of the Fornax cluster
Man Ho Chan
Recent studies of merging black holes suggest that the cosmological mass fraction of primordial black holes (PBHs) is not completely negligible. The mass of a PBH can be as massive…
Constraining dark matter by the 511 keV line
Man Ho Chan, Chung Hei Leung
In the past few decades, observations indicated that an unexplained high production rate of positrons (the strong 511 keV line) exists in the Milky Way center. By using the fact th…