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• W2991280039 abstract "We report on VLBI observations of the fast and blue optical transient (FBOT), AT 2018cow. At ~62 Mpc, AT 2018cow is the first relatively nearby FBOT. The nature of AT 2018cow is not clear, although various hypotheses from a tidal disruption event to different kinds of supernovae have been suggested. It had a very fast rise time (3.5 d) and an almost featureless blue spectrum although high photospheric velocities (40,000 km s$^{-1}$) were suggested early on. The X-ray luminosity was very high, ~$1.4 times 10^{43}$ erg s$^{-1}$, larger than those of ordinary SNe, and more consistent with those of SNe associated with gamma-ray bursts. Variable hard X-ray emission hints at a long-lived central engine. It was also fairly radio luminous, with a peak 8.4-GHz spectral luminosity of ~$4 times 10^{28}$ erg s$^{-1}$ Hz$^{-1}$, allowing us to make VLBI observations at ages between 22 and 287 d. We do not resolve AT 2018cow. Assuming a circularly symmetric source, our observations constrain the average apparent expansion velocity to be <0.49$c$ by t = 98 d (3$sigma$ limit). We also constrain the proper motion of AT 2018cow to be <0.51$c$. Since the radio emission generally traces the fastest ejecta, our observations make the presence of a long-lived relativistic jet with a lifetime of more than one month very unlikely." @default.
• W2991280039 created "2019-12-05" @default.
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• W2991280039 date "2019-11-21" @default.
• W2991280039 modified "2023-10-17" @default.
• W2991280039 title "AT 2018cow VLBI: no long-lived relativistic outflow" @default.
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• W2991280039 doi "https://doi.org/10.1093/mnras/stz3249" @default.
• W2991280039 hasPublicationYear "2019" @default.
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