Implications from the Upper Limit of Radio Afterglow Emission of FRB 131104/Swift J0644.5-5111
Document Type
Article
Publication Date
1-1-2017
Publication Title
Astrophysical Journal Letters
Volume
835
Issue
2
Abstract
A γ-ray transient, Swift J0644.5-5111, has been claimed to be associated with FRB 131104. However, a long-term radio imaging follow-up observation only placed an upper limit on the radio afterglow flux of Swift J0644.5-5111. Applying the external shock model, we perform a detailed constraint on the afterglow parameters for the FRB 131104/Swift J0644.5-5111 system. We find that for the commonly used microphysics shock parameters (e.g., , , and p = 2.3), if the fast radio burst (FRB) is indeed cosmological as inferred from its measured dispersion measure (DM), the ambient medium number density should be , which is the typical value for a compact binary merger environment but disfavors a massive star origin. Assuming a typical ISM density, one would require that the redshift of the FRB be much smaller than the value inferred from DM (), implying a non-cosmological origin of DM. The constraints are much looser if one adopts smaller and values, as observed in some gamma-ray burst afterglows. The FRB 131104/Swift J0644.5-5111 association remains plausible. We critically discuss possible progenitor models for the system. � 2017. The American Astronomical Society. All rights reserved..
File Format
File Size
785 KB
Language
english
Repository Citation
Gao, H.,
Zhang, B.
(2017).
Implications from the Upper Limit of Radio Afterglow Emission of FRB 131104/Swift J0644.5-5111.
Astrophysical Journal Letters, 835(2),
http://dx.doi.org/10.3847/2041-8213/835/2/L21
