CGCA Logo

Leonard E Parker

Center for Gravitation, Cosmology & Astrophysics

UWM Logo
Leonard E Parker Center for Gravitation, Cosmology and Astrophysics

Follow us on:

Projects:

LIGO Nanograv E@H ARCC RNS

Make a Gift

Thank you for considering a gift to the Leonard E Parker Center for Gravitation, Cosmology and Astrophysics. Your gift of any size makes a difference. Make a Gift Online.

Get Involved

There are many ways to participate in the life of the Leonard E Parker Center for Gravitation, Cosmology and Astrophysics. Please get involved, learn more about our fascinating Universe, and meet our members. Get involved!

Acknowledgement

The Leonard E Parker Center for Gravitation, Cosmology and Astrophysics is supported by NASA, the National Science Foundation, UW-Milwaukee College of Letters and Science, and UW-Milwaukee Graduate School. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of these organizations.

Wide-Angle Outflow in GW170817

Posted by DK on December 21, 2017

GW170817 continues to brighten in radio: evidence against a jet

Ever since its first detection on September 2, 2017, we have continued to monitor the radio emission from GW170817 with radio telescopes around the world including the Jansky Very Large Array (VLA), the Australia Telescope Compact Array (ATCA), and the Giant Metrewave Radio Telescope (GMRT). Today, in research published in Nature, we show that the radio emission has continued to get brighter. This is contrary to previous models where the radio is related to emission from a narrow, ultra-relativistic jet of material. Instead we believe that the afterglow of GW170817 is arising from a mildly relativistic wide-angle outflow moving towards us. The cocoon model, in which an ultra-relativistic jet dissipates its energy into the neutron-rich dynamical ejecta, can explain the gamma-rays, X-rays and radio emission from GW170817.

Radio
										   images
Radio emission from GW170817 over time, showing the increase in brightness. Credit: Kunal Mooley (Oxford/Caltech).
For more information see:

Urban Milwaukee coverage of UWM Press Release

Caltech press release


UWM Center for Gravitation and Cosmology | http://www.gravity.phys.uwm.edu/ | contact@gravity.phys.uwm.edu