Constraints on gamma-ray burst inner engines in a Blandford–Znajek framework
Abstract
Under the assumption that a gamma-ray burst (GRB) is ultimately produced by a Blandford–Znajek (BZ) jet from a highly spinning black hole (BH), we put limits on the magnetic field and BH mass needed to power observed long and short GRBs. For BHs in the range of 2--10M⊙ (for long GRBs) and 0.5--4M⊙ (for short GRBs), we find magnetic fields in the range of 5 × 1014 ≲ B ≲ 1017 G are needed to power the observed GRBs. Under the simple assumption of flux conservation, we estimate the magnetic fields of the progenitor systems for both long and short GRBs, finding that single massive star progenitors require fields ~106 G and neutron star merger systems require fields ~1015 G. We also discuss the implications and consequences of high magnetic fields in GRB BH-disc systems, in terms of magnetorotational instability field growth and magnetically arrested discs. Finally, we examine the conditions under which the progenitor systems can retain enough angular momentum to create BHs spinning rapidly enough to power BZ jets.
- Authors:
-
- Center for Theoretical Astrophysics and CCS-2, Los Alamos National Lab, Los Alamos, NM, USA;University of New Mexico, Los Alamos, NM 87544, USA
- Center for Theoretical Astrophysics and CCS-2, Los Alamos National Lab, Los Alamos, NM, USA
- University of California, San Diego, CA 92093, USA
- University of New Mexico, Los Alamos, NM 87544, USA
- Cornell University, Ithaca, NY 14853, USA
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1495502
- Alternate Identifier(s):
- OSTI ID: 1768536
- Report Number(s):
- LA-UR-18-31627
Journal ID: ISSN 0035-8711
- Grant/Contract Number:
- 89233218CNA000001; 20170508DR
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 485 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; gamma-ray burst
Citation Formats
Lloyd-Ronning, Nicole M., Fryer, Chris, Miller, Jonah M., Prasad, Neelima, Torres, Chris, and Martin, Phillip. Constraints on gamma-ray burst inner engines in a Blandford–Znajek framework. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz390.
Lloyd-Ronning, Nicole M., Fryer, Chris, Miller, Jonah M., Prasad, Neelima, Torres, Chris, & Martin, Phillip. Constraints on gamma-ray burst inner engines in a Blandford–Znajek framework. United Kingdom. https://doi.org/10.1093/mnras/stz390
Lloyd-Ronning, Nicole M., Fryer, Chris, Miller, Jonah M., Prasad, Neelima, Torres, Chris, and Martin, Phillip. Mon .
"Constraints on gamma-ray burst inner engines in a Blandford–Znajek framework". United Kingdom. https://doi.org/10.1093/mnras/stz390.
@article{osti_1495502,
title = {Constraints on gamma-ray burst inner engines in a Blandford–Znajek framework},
author = {Lloyd-Ronning, Nicole M. and Fryer, Chris and Miller, Jonah M. and Prasad, Neelima and Torres, Chris and Martin, Phillip},
abstractNote = {Under the assumption that a gamma-ray burst (GRB) is ultimately produced by a Blandford–Znajek (BZ) jet from a highly spinning black hole (BH), we put limits on the magnetic field and BH mass needed to power observed long and short GRBs. For BHs in the range of 2--10M⊙ (for long GRBs) and 0.5--4M⊙ (for short GRBs), we find magnetic fields in the range of 5 × 1014 ≲ B ≲ 1017 G are needed to power the observed GRBs. Under the simple assumption of flux conservation, we estimate the magnetic fields of the progenitor systems for both long and short GRBs, finding that single massive star progenitors require fields ~106 G and neutron star merger systems require fields ~1015 G. We also discuss the implications and consequences of high magnetic fields in GRB BH-disc systems, in terms of magnetorotational instability field growth and magnetically arrested discs. Finally, we examine the conditions under which the progenitor systems can retain enough angular momentum to create BHs spinning rapidly enough to power BZ jets.},
doi = {10.1093/mnras/stz390},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 485,
place = {United Kingdom},
year = {Mon Feb 11 00:00:00 EST 2019},
month = {Mon Feb 11 00:00:00 EST 2019}
}
https://doi.org/10.1093/mnras/stz390
Web of Science
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