AT2018cow: A Luminous Millimeter Transient

  title={AT2018cow: A Luminous Millimeter Transient},
  author={Anna Y. Q. Ho and E. S. Phinney and Vikram Ravi and Shrinivas R. Kulkarni and Glen Raymond Petitpas and Bjorn H. C. Emonts and Varun Bhalerao and Raymond Blundell and S. Bradley Cenko and Dougal Dobie and Ryan Howie and Nikita Kamraj and Mansi M. Kasliwal and Tara Murphy and Daniel A. Perley and Sridharan T. K. and Ilsang Yoon},
  journal={The Astrophysical Journal},
We present detailed submillimeter- through centimeter-wave observations of the extraordinary extragalactic transient AT2018cow. The apparent characteristics -- the high radio luminosity, the long-lived emission plateau at millimeter bands, and the sub-relativistic velocity -- have no precedent. A basic interpretation of the data suggests $E_k \gtrsim 10^{48}$ erg coupled to a fast but sub-relativistic ($v \approx 0.13c$) shock in a dense ($n_e \approx 3 \times 10^{5}\,$cm$^{-3}$) medium. We… Expand

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