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The host galaxies and progenitors of Fast Radio Bursts localized with the Australian Square Kilometre Array Pathfinder
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abstract
The Australian SKA Pathfinder (ASKAP) telescope has started to localize Fast Radio Bursts (FRBs) to arcsecond accuracy from the detection of a single pulse, allowing their host galaxies to be reliably identified. We discuss the global properties of the host galaxies of the first four FRBs localized by ASKAP, which lie in the redshift range $0.11<z<0.48$. All four are massive galaxies (log( $M_{*}/ M_{\odot}$) $\sim 9.4 -10.4$) with modest star-formation rates of up to $2M_{\odot}$yr$^{-1}$ -- very different to the host galaxy of the first repeating FRB 121102, which is a dwarf galaxy with a high specific star-formation rate. The FRBs localized by ASKAP typically lie in the outskirts of their host galaxies, which appears to rule out FRB progenitor models that invoke active galactic nuclei (AGN) or free-floating cosmic strings. The stellar population seen in these host galaxies also disfavors models in which all FRBs arise from young magnetars produced by superluminous supernovae (SLSNe), as proposed for the progenitor of FRB 121102. A range of other progenitor models (including compact-object mergers and magnetars arising from normal core-collapse supernovae) remain plausible.
Forward citations
Cited by 4 Pith papers
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The One-Loop Power Spectrum of Fast Radio Burst Dispersion Measures
A one-loop EFT power spectrum model for FRB free-electron clustering matches FLAMINGO simulations to k ~ 0.2 h/Mpc, with electron bias b_e ~ 0.92 and near-perfect electron-matter correlation.
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Evidence for Enhancement in the Rate of Fast Radio Bursts Toward Galaxy Clusters
A 3-sigma excess of fast radio bursts is found along galaxy cluster lines of sight in the CHIME/FRB second baseband catalog, about 1.4% of detections, attributed to member galaxies and gravitational lensing.
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Formation of rotating supergiants via stellar mergers in dense clusters: Implications for black hole natal spins
Stellar mergers with mass ratio q≳0.3 in young clusters can produce blue-supergiant progenitors that leave black holes with dimensionless spins a≃0.5–0.8, reducing post-merger retention and hierarchical-merger rates.
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H.E.S.S. programme searching for VHE gamma rays associated with FRBs
H.E.S.S. found no very high energy gamma-ray counterpart to targeted fast radio bursts, setting 99% confidence upper limits on their luminosity of 10^44 to 10^48 erg/s.
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