Difference between revisions of "Young Magnetars"

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{{FRBTableTemplate
 
{{FRBTableTemplate
 
|Category              = Merger/Collapse
 
|Category              = Merger/Collapse
|Progenitor            = Magnetars Born in NS-NS Mergers and WD Collapse
+
|Progenitor            = Magnetars Born in BNS Mergers and WD Collapse
 
|Type                  = Repeat
 
|Type                  = Repeat
 
|EnergyMechanism        = Maser
 
|EnergyMechanism        = Maser
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|MicrowaveCounterpart  = Maybe
 
|MicrowaveCounterpart  = Maybe
 
|THzCounterpart        = Maybe
 
|THzCounterpart        = Maybe
|OIRCounterpart        = No
+
|OIRCounterpart        = Possible SN
 
|XrayCounterpart        = Afterglow
 
|XrayCounterpart        = Afterglow
|GammarayCounterpart    = Yes <br/> if jet aligned
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|GammarayCounterpart    = SGRB
 
|GWCounterpart          = Yes
 
|GWCounterpart          = Yes
 
|NeutrinoCounterpart    = Not detectable
 
|NeutrinoCounterpart    = Not detectable
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== Model Description ==
 
== Model Description ==
This model considers FRBs from magnetars born in NS-NS mergers and accretion induced WD collapse. The FRBs themselves are formed by the same mechanism as that of giant flare FRB theories.
+
The localization of FRB 180924 to the outskirts of a massive early-type host galaxy suggests FRBs may be from magnetars born in binary neutron star (BNS) mergers and accretion induced WD collapse. The FRBs themselves are formed by the same mechanism as that of giant flare FRB theories.
  
 
== Observational Constraints ==
 
== Observational Constraints ==
  
Persistent synchrotron radio emission with timescales of months to years from the nebula or on longer timescales when the merger ejecta interacts with the ISM, but is shorter than for the SLSNe/LGRBs. The accretion-induced collapse of a WD has yet to be observed but might produce a SNIa-like transient.
+
SGRBs are expected in BNS mergers. The accretion-induced collapse of a WD has yet to be observed but might produce a SN Type Ia-like transient. Persistent synchrotron radio emission may be observable with timescales of months to years from the nebula or on longer timescales when the merger ejecta interacts with the ISM, but is shorter than for the SLSNe/LGRBs. BNS mergers are expected in all galaxy types and may be spatially offset from their birth sites or host galaxies.
  
  
== ==  
+
== Consistency with Observations ==  
  
Using FRB 121102 to calibrate the model, the expected DM, RM and persistent radio emission is consistent with the upper limits of FRB 180924. FRBs from NS-NS magnetars distinct host galaxy and spatial offset distributions than the SLSNe/LGRB channel; we anticipate asimilar host population, although possibly different offset distribution for AIC events. It may be more difficult to detect persistent nebular radio emission from known FRB positions than in the SLSN/LGRB case because of high ejecta velocity and low ejecta mass: the emission peaks at early times and the ejecta become transparent to free-free absorption earlier. This is consistent with the non-detection of persistent emission from FRB 180924 and could explain its lower RM.
+
Using FRB 121102 to calibrate the model, the expected DM, RM and persistent radio emission is consistent with the upper limits of FRB 180924. The host galaxy and offset of FRB 180924 from the center are consistent with distributions of SGRBs and Type Ia SNe. It may be more difficult to detect persistent nebular radio emission from known FRB positions than in the SLSN/LGRB case because of high ejecta velocity and low ejecta mass: the emission peaks at early times and the ejecta become transparent to free-free absorption earlier. This is consistent with the non-detection of persistent emission from FRB 180924 and could explain its lower RM.

Revision as of 09:17, 6 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
Merger/Collapse Magnetars Born in BNS Mergers and WD Collapse Repeat Maser Synch. Yes, persistent Yes, persistent Maybe Maybe Possible SN Afterglow SGRB Yes Not detectable https://arxiv.org/pdf/1907.00016.pdf Same mechanisms as flares, but magnetars born in mergers or collapse as opposed in to SLSNe or LGRBs.

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


Model Description

The localization of FRB 180924 to the outskirts of a massive early-type host galaxy suggests FRBs may be from magnetars born in binary neutron star (BNS) mergers and accretion induced WD collapse. The FRBs themselves are formed by the same mechanism as that of giant flare FRB theories.

Observational Constraints

SGRBs are expected in BNS mergers. The accretion-induced collapse of a WD has yet to be observed but might produce a SN Type Ia-like transient. Persistent synchrotron radio emission may be observable with timescales of months to years from the nebula or on longer timescales when the merger ejecta interacts with the ISM, but is shorter than for the SLSNe/LGRBs. BNS mergers are expected in all galaxy types and may be spatially offset from their birth sites or host galaxies.


Consistency with Observations

Using FRB 121102 to calibrate the model, the expected DM, RM and persistent radio emission is consistent with the upper limits of FRB 180924. The host galaxy and offset of FRB 180924 from the center are consistent with distributions of SGRBs and Type Ia SNe. It may be more difficult to detect persistent nebular radio emission from known FRB positions than in the SLSN/LGRB case because of high ejecta velocity and low ejecta mass: the emission peaks at early times and the ejecta become transparent to free-free absorption earlier. This is consistent with the non-detection of persistent emission from FRB 180924 and could explain its lower RM.