Abstract The issue of destroying small polycyclic aromatic hydrocarbon (PAH) par- ticles by radiation from AGNs is examined through optical narrow-emission line r
The fact that infrared ring nebulae(IRRNe) are frequently associated with HⅡ regions provides us with an opportunity to study dust at the interface between ion
We introduce a non-parametric method for open cluster membership determination in threedimensional(3D) velocity space(proper motion and radial velocity). Clean
Pulsar timing uses planetary ephemerides to convert the measured pulse arrival time at an observatory to the arrival time at the Solar System barycenter(SSB). S