A Unified Model for GRB Prompt Emission from Optical to -Rays; Exploring GRBs as Standard Candle
Jun 23, 20166 pages
Published in:
- Astrophys.J.Lett. 831 (2016) 1, L8
- Published: Oct 27, 2016
e-Print:
- 1606.07193 [astro-ph.HE]
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Abstract: (IOP)
The origin of prompt emission from gamma-ray bursts (GRBs) remains to be an open question. Correlated prompt optical and γ-ray emission observed in a handful of GRBs strongly suggests a common emission region, but failure to adequately fit the broadband GRB spectrum prompted the hypothesis of different emission mechanisms for the low- and high-energy radiations. We demonstrate that our multi-component model for GRB γ-ray prompt emission provides an excellent fit to GRB 110205A from optical to γ-ray energies. Our results show that the optical and highest γ-ray emissions have the same spatial and spectral origin, which is different from the bulk of the X- and softest γ-ray radiation. Finally, our accurate redshift estimate for GRB 110205A demonstrates promise for using GRBs as cosmological standard candles.Note:
- 6 pages of article (4 figures and 1 table). Accepted for publication in ApJ Letters on 2016 August 31 and published on 2016 October 27
- acceleration of particles
- black hole physics
- distance scale
- gamma-ray burst: general
- radiation mechanisms: non-thermal
- radiation mechanisms: thermal
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