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Exploring the universe like a wolf chasing the moon

Fig 1. The first discovered repeater FRB 121102

Fig 2. Time-Frequency drift of FRB 180814.J0422+73

Fast Radio Busrt

Fast radio bursts (FRBs) are mysterious millisecond-duration astronomical radio transients with large dispersion measures in excess of the Galactic value. The cosmological origin of FRBs was established after FRB 121102, the first repeating source, was localized in a star-forming dwarf galaxy at z = 0.193 with an associated persistent radio source. It is proposed that FRBs are highly likely to be associated with pulsars, and more than a few efforts have been made to understand their mysterious origins.

Repeaters are some very peculiar FRBs. They may have different origins with non-repeating FRBs. Repeaters also exhibit some interesting properties such as the so-called time-frequency pattern. These properties are thought to carry more physical information about the origin of FRB（Fig 2 is cited from CHIME/FRB Collaboration et al. 2019）.

Pulsar-like Compact Star

Pulsars are rotating magnetized neutron stars with multifarious radiations. They are excellent tools for studying fundamental physics.

The Magnificent Seven refers to seven X-ray-dim isolated neutron stars (XDINSs) with thermal radiation in the form of soft Xrays, which offer an unprecedented opportunity to unveil their surface temperature and magnetic field as well as the state of dense matter at supra nuclear densities.

Magnetars are highly magnetized and slowly rotating neutron stars, which are historically identified as two related classes, anomalous X-ray pulsars and soft gamma-ray repeaters. They exhibit dramatically variable X-ray and γ-ray emissions including short bursts, large outbursts, giant flares, and quasi-periodic oscillations, which are believed to be powered by the dissipation of their enormous internal magnetic fields. Magnetars are often accompanied by glitches that show irregular spin-down evolutions. These behaviors may be related to the origin of magnetar bursts.

Fig 3. Neutron star and Strange quark star

Fig 4. P-Pdot Diagram (the Pulsar Zoo)

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