A comparison between radio loud and quiet gamma-ray bursts, and evidence for a potential correlation between intrinsic duration and redshift in the radio loud population

Lloyd-Ronning, Nicole M.; Gompertz, Ben; Pe'er, Asaf; Dainotti, M. G.; Fruchter, Andrew S.

A comparison between radio loud and quiet gamma-ray bursts, and evidence for a potential correlation between intrinsic duration and redshift in the radio loud population

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Published version

Date

2019-01-25

Authors

Lloyd-Ronning, Nicole M.

Gompertz, Ben

Pe'er, Asaf

Dainotti, M. G.

Fruchter, Andrew S.

Publisher

IOP Publishing; American Astronomical Society

Published Version

10.3847/1538-4357/aaf6ac

Abstract

We extend our study of energetic radio-loud and -quiet gamma-ray bursts (GRBs), suggesting these GRBs potentially come from two separate progenitor systems. We expand the sample from our previous paper and find that our results are strengthened—radio-quiet GRBs have significantly shorter intrinsic prompt duration, and are also less energetic on average. However, the tenuous correlation between isotropic energy and intrinsic duration in the radio dark sample remains tenuous and is slightly weakened by adding more bursts. Interestingly, we find an anticorrelation between the intrinsic duration and redshift in the radio bright sample but not the radio dark sample, further supporting that these two samples may come from separate progenitors. We also find that very high energy (0.1–100 GeV) extended emission is only present in the radio-loud sample. There is no significant difference between the presence of X-ray/optical plateaus or the average jet opening angles between the two samples. We explore the interpretation of these results in the context of different progenitor models. The data are consistent with the radio-loud GRBs coming from a helium merger system and the radio-quiet GRBs coming from a collapsar system, but may also reflect other dichotomies in the inner engine such as a neutron star versus black hole core.

Keywords

Gamma-ray bursts: general , Stars: general , Gamma rays

Citation

Lloyd-Ronning, N. M., Gompertz, B., Pe’er, A., Dainotti, M. and Fruchter, A. (2019) 'A Comparison between Radio Loud and Quiet Gamma-Ray Bursts, and Evidence for a Potential Correlation between Intrinsic Duration and Redshift in the Radio Loud Population', The Astrophysical Journal, 871(1), 118 (8 pp). doi: 10.3847/1538-4357/aaf6ac