Difference between revisions of "Magnetars with Low Magnetospheric Twist"

From FRB Theory Wiki
Jump to: navigation, search
(Created page with " <!-- Brings in the summary table --> <!-- This is an example. Change the right hand side of all these assignments --> {{FRBTableTemplate |Category = Other |Pro...")
 
Line 17: Line 17:
 
|GammarayCounterpart    = Yes <br/> if jet aligned
 
|GammarayCounterpart    = Yes <br/> if jet aligned
 
|GWCounterpart          = Yes
 
|GWCounterpart          = Yes
|NeutrinoCounterpart    = Not detectable
+
|NeutrinoCounterpart    = ---
|References            = http://adsabs.harvard.edu/abs/2018arXiv180804822P, http://adsabs.harvard.edu/abs/2018arXiv180804822P
+
|References            = https://arxiv.org/pdf/1904.12036.pdf
|Comments              = None
+
|Comments              = Unlikely to form in Galactic magnetars.
 
}}
 
}}
  
 
== Model Description ==
 
== Model Description ==
FRBs may be the result of short bursts created in the closed field line regions of magnetar magnetospheres (as opposed to near the caps as in pulses). Crustal slippage on the surface of the magnetar causes magnetic reconnection and thus particle acceleration, producing coherent emission.
+
FRBs may be the result of short bursts created in the closed field line regions of magnetar magnetospheres. Crustal slippage on the surface of the magnetar causes magnetic reconnection and thus particle acceleration, producing coherent emission. To allow emission to escape, the magnetars must have a low-density plasma in the closed field line regions, and hence must have low magnetospheric twist.  
  
 
== Observational Constraints ==
 
== Observational Constraints ==
 +
Unlikely to form in Galactic magnetars, which have a relatively high magnetospheric twist. Signals above a few MeV are expected to be suppressed by photon splitting and magnetic pair production in the magnetosphere.

Revision as of 13:42, 5 September 2019





Summary Table
Category Progenitor Type Energy Mechanism Emission Mechanism Counterparts References Brief Comments
LF Radio HF Radio Microwave Terahertz Optical/IR X-rays Gamma-rays Gravitational Waves Neutrinos
Other Magnetars with Low Magnetospheric Twist Repeat Mag. reconnection Curv. Yes
(excl. self absorption)
Yes Maybe Maybe No Afterglow Yes
if jet aligned
Yes --- https://arxiv.org/pdf/1904.12036.pdf Unlikely to form in Galactic magnetars.

Definitions: LF Radio (3 MHz to 3 GHz); HF Radio (3 GHz to 30 GHz); Microwave (30 to 300 GHz)


Model Description

FRBs may be the result of short bursts created in the closed field line regions of magnetar magnetospheres. Crustal slippage on the surface of the magnetar causes magnetic reconnection and thus particle acceleration, producing coherent emission. To allow emission to escape, the magnetars must have a low-density plasma in the closed field line regions, and hence must have low magnetospheric twist.

Observational Constraints

Unlikely to form in Galactic magnetars, which have a relatively high magnetospheric twist. Signals above a few MeV are expected to be suppressed by photon splitting and magnetic pair production in the magnetosphere.