SIMBAD references

2018ApJ...855...91W - Astrophys. J., 855, 91-91 (2018/March-2)

A global photoionization response to prompt emission and outliers: different origin of long gamma-ray bursts?

WANG J., XIN L.P., QIU Y.L., XU D.W. and WEI J.Y.

Abstract (from CDS):

By using the line ratio C IV λ1549/C IIλ1335 as a tracer of the ionization ratio of the interstellar medium (ISM) illuminated by a long gamma-ray burst (LGRB), we identify a global photoionization response of the ionization ratio to the photon luminosity of the prompt emission assessed by either Liso/Epeak or Liso/Epeak2. The ionization ratio increases with both Liso/Epeak and Liso/E2peak for a majority of the LGRBs in our sample, although there are a few outliers. The identified dependence of C IV/C II on Liso/Epeak2 suggests that the scatter of the widely accepted Amati relation is related to the ionization ratio in the ISM. The outliers tend to have relatively high C IV/C II values as well as relatively high C IV λ1549/Si IV λ1403 ratios, which suggests an existence of Wolf-Rayet stars in the environment of these LGRBs. We finally argue that the outliers and the LGRBs following the identified C IV/C II-Liso/Epeak (Liso/Epeak2) correlation might come from different progenitors with different local environments.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: ISM - gamma-ray burst: general - methods: statistical

Simbad objects: 29

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2020.02.17-11:51:34

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