Seminar:- Mysteries of fast radio bursts
Making use of exponential increases in computing power and memory per dollar, radio astronomers have been able to search larger areas of sky with ever higher bandwidth at high time and frequency resolution. In 2007, a mysterious millisecond-duration burst was found around the cellphone band. This kind of signal is now known as Fast Radio Burst(FRB), energetic bursts visible at a cosmological distance. FRBs are a new probe of cosmological matter, since each burst carries information on the number of electrons it encounters before reaching the earth. In this talk, the speaker will review the current understanding of the origin of FRBs, as well as the many remaining mysteries, including the location of the FRBs, the magneto-environment and the long-term periodicity. She will also discuss the observed properties of special pulsar systems that help us understand FRBs. In the next few years, current and upcoming instruments will detect more FRBs with orders of magnitude better spatial resolution. The result will be an explosion of opportunity for related fields, such as cosmology, dynamics of compact objects, magnetars and their surrounding medium.
講者：Dr. Dongzi LI 李冬子 博士 (California Institute of Technology)