A Radio Source Coincident with the Superluminous Supernova PTF10hgi: Evidence for a Central Engine and an Analogue of the Repeating FRB121102?. (arXiv:1901.10479v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Eftekhari_T/0/1/0/all/0/1">T. Eftekhari</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Berger_E/0/1/0/all/0/1">E. Berger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Margalit_B/0/1/0/all/0/1">B. Margalit</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Blanchard_P/0/1/0/all/0/1">P. K. Blanchard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Patton_L/0/1/0/all/0/1">L. Patton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Demorest_P/0/1/0/all/0/1">P. Demorest</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Williams_P/0/1/0/all/0/1">P. K. G. Williams</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chatterjee_S/0/1/0/all/0/1">S. Chatterjee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cordes_J/0/1/0/all/0/1">J. M. Cordes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lunnan_R/0/1/0/all/0/1">R. Lunnan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Metzger_B/0/1/0/all/0/1">B. D. Metzger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nicholl_M/0/1/0/all/0/1">M. Nicholl</a>

We present the detection of an unresolved radio source coincident with the
position of the Type I superluminous supernova (SLSN) PTF10hgi ($z=0.098$)
about 7.5 years post-explosion, with a luminosity of $L_nu(6,,{rm
GHz})approx 1.1times 10^{28}$ erg s$^{-1}$ Hz$^{-1}$. This represents the
first detection of radio emission coincident with a SLSN on any timescale. We
investigate various scenarios for the origin of the radio emission: star
formation activity, an active galactic nucleus, an off-axis jet, and a
non-relativistic supernova blastwave. While any of these would be quite novel
if confirmed, none appear likely when taken in context of the other properties
of the host galaxy, previous radio observations of SLSNe, the sample of long
gamma-ray bursts (LGRBs), and the general population of hydrogen-poor SNe.
Instead, the radio emission is reminiscent of the quiescent radio source
associated with the repeating FRB 121102, which has been argued to be powered
by a magnetar born in a SLSN or LGRB explosion several decades ago. We show
that such a central engine powered nebula is consistent with the age and
luminosity of the radio source. Our directed search for FRBs from the location
of PTF10hgi using 40 min of VLA phased-array data reveals no detections to a
limit of $22$ mJy ($7sigma$; 10 ms duration). We outline several follow-up
observations that can conclusively establish the origin of the radio emission.

We present the detection of an unresolved radio source coincident with the
position of the Type I superluminous supernova (SLSN) PTF10hgi ($z=0.098$)
about 7.5 years post-explosion, with a luminosity of $L_nu(6,,{rm
GHz})approx 1.1times 10^{28}$ erg s$^{-1}$ Hz$^{-1}$. This represents the
first detection of radio emission coincident with a SLSN on any timescale. We
investigate various scenarios for the origin of the radio emission: star
formation activity, an active galactic nucleus, an off-axis jet, and a
non-relativistic supernova blastwave. While any of these would be quite novel
if confirmed, none appear likely when taken in context of the other properties
of the host galaxy, previous radio observations of SLSNe, the sample of long
gamma-ray bursts (LGRBs), and the general population of hydrogen-poor SNe.
Instead, the radio emission is reminiscent of the quiescent radio source
associated with the repeating FRB 121102, which has been argued to be powered
by a magnetar born in a SLSN or LGRB explosion several decades ago. We show
that such a central engine powered nebula is consistent with the age and
luminosity of the radio source. Our directed search for FRBs from the location
of PTF10hgi using 40 min of VLA phased-array data reveals no detections to a
limit of $22$ mJy ($7sigma$; 10 ms duration). We outline several follow-up
observations that can conclusively establish the origin of the radio emission.

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