The lively radio transient sky

Speaker: Dr. Dongzi Li

Background

• 1. FRB: bright, millisecond burst in radio
• 2. It can serve as a new cosmology probe

FRB progenitor

To test the scenario of the FRB progenitor:

• 1. the energy rate: up to ${10}^{35}\mathrm{erg}/\mathrm{s}/\mathrm{Hz}$
• 2. the volumetric rate: ${10}^5/{\mathrm{Gpc}}^3/\mathrm{yr}$.

Some scenarios:

• 1. Magnetar: they are young ($\lesssim 0.1\mathrm{Myr}$) and trace star formation.
• 2. Merger: the major contribution cannot be the merger events as the volumetric rate of meger is too low than the FRB.

Propagation effect

• 1. High frequency dependence
• 2. Disersion measure
• 3. Rotation measure

How plasma lense improve the resolution

• 1. If the emission region is larger than the resolution, different part of the emission region will be magnified differently, which impoves the resolution.
• 2. If the emission region is smaller than the resolution, the magnification will be the same, which does not improve the resolution.