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Fragmentation and isomerization of polycyclic aromatic hydrocarbons in the interstellar medium: coronene as a case study
Tao Chen, Yi Luo, Aigen Li
Aims. Due to the limitations of current computational technology, the fragmentation and isomerization products of vibrationally-excited polycyclic aromatic hydrocarbon (PAH) molecu…
The infrared bands of polycyclic aromatic hydrocarbons in the 1.6-1.7 μm wavelength region
Tao Chen, Yi Luo, Aigen Li
Context. The 3.3 m aromatic C-H stretching band of polycyclic aromatic hydrocarbon (PAH) molecules seen in a wide variety of astrophysical regions is often accompanied by a seri…
Probing the Missing Link between the Diffuse Interstellar Bands and the Total-to-Selective Extinction Ratio I. Extinction versus Reddening
Kaijun Li, Aigen Li, F. Y. Xiang
The carriers of the still (mostly) unidentified diffuse interstellar bands (DIBs) have been a long-standing mystery ever since their first discovery exactly 100 years ago. In recen…
How Much Graphene in Space?
Qi Li, Aigen Li, B. W. Jiang
The possible presence of graphene in the interstellar medium (ISM) is examined by comparing the interstellar extinction curve with the ultraviolet absorption of graphene calculated…
Synthesizing carbon nanotubes in space
Tao Chen, Aigen Li
Context. As the 4th most abundant element in the universe, carbon (C) is widespread in the interstellar medium (ISM) in various allotropic forms (e.g., fullerenes have been identif…
Two Numerical Methods for the 3D Anisotropic Propagation of Galactic Cosmic Rays
Wei Liu, Su-jie Lin, Hong-bo Hu +2
Conventional cosmic-ray propagation models usually assume an isotropic diffusion coefficient to account for the random deflection of cosmic rays by the turbulent interstellar magne…