The excitation of H2O masers usually needs very high density gas,hence it can serve as a marker of dense gas in HⅡ region. We selected a sample of H2O maser so
The optical spectrum of SDSS J022119.84 + 005628.4 (R. A. = 02h 21m 19.84s, Dec = 00°56′ 28.4", J2000; z - 0.399785 ± 0.000558) is analyzed by multi-
We present a multi-wavelength study of the gravitational lens COSMOS J095930+023427 (z l=0.892),together with the associated galaxy group along the line of sigh
One large glitch was detected in PSR B1737-30 using data spanning from MJD 57999 to 58406 obtained with the newly built Shanghai Tian Ma Radio Telescope(TMRT).
We investigate the spatial dependence of high energy electrons and their radiations in pulsar wind nebulae(PWNe).By assuming a time-dependent broken power-law inj