Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Aaron B. Pearlman, Paul Scholz, Suryarao Bethapudi, Jason W. T. Hessels, Victoria M. Kaspi
| Summary:
The precise origins of fast radio bursts (FRBs) remain unknown.
Multiwavelength observations of nearby FRB sources can provide important
insights into the enigmatic FRB phenomenon. Here, we present results from a
sensitive, broadband X-ray and radio observational campaign of FRB 20200120E,
the closest known extragalactic repeating FRB source (located 3.63 Mpc away in
an ~10-Gyr-old globular cluster). We place deep limits on the persistent and
prompt X-ray emission from FRB 20200120E, which we use to constrain possible
origins for the source. We compare our results with various classes of X-ray
sources, transients, and FRB models. We find that FRB 20200120E is unlikely to
be associated with ultraluminous X-ray bursts, magnetar-like giant flares, or
an SGR 1935+2154-like intermediate flare. Although other types of bright
magnetar-like intermediate flares and short X-ray bursts would have been
detectable from FRB 20200120E during our observations, we cannot entirely rule
them out as a class. We show that FRB 20200120E is unlikely to be powered by an
ultraluminous X-ray source or a young extragalactic pulsar embedded in a
Crab-like nebula. We also provide new constraints on the compatibility of FRB
20200120E with accretion-based FRB models involving X-ray binaries. These
results highlight the power of multiwavelength observations of nearby FRBs for
discriminating between FRB models.
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