摘要
In observational astronomy,we essentially measure the location,flux density(at some frequency and some time),distance,and angular size of the sources.We can construct a parameter space of observational astronomy with the parameters,such as the sample size of sources,frequency(bandwidth and frequency resolution),time(observing length and time resolution),sensitivity,and angular resolution of the telescope.We would always obtain new knowledge of the universe with instruments that fill in the blanks in the parameter space,eg,telescopes used for better surveys(which enlarge the sample sizes of sources)and telescopes with higher sensitivity,angular resolution,frequency resolution,or time resolution.
基金
supported by National SKA Program of China no.2020SKA0120100
National Natural Science Foundation of China(NSFC)under grant nos.12003047,12041303,and 12173053
supported by the Youth Innovation Promotion Association of CAS(id.2018075)
the CAS“Light of West China”Program.
