Discovery of an Outflow from Radio Observations of the Tidal Disruption event ASASSN-14li
MetadataShow full item record
CitationAlexander, K. D., E. Berger, J. Guillochon, B. A. Zauderer, and P. K. G. Williams. 2016. “Discovery of an Outflow from Radio Observations of the Tidal Disruption event ASASSN-14li.” The Astrophysical Journal 819 (2) (March 4): L25. doi:10.3847/2041-8205/819/2/l25.
AbstractWe report the discovery of transient radio emission from the nearby optically-discovered TDE ASASSN-14li (distance of 90 Mpc), making it the first typical TDE detected in the radio, and unambiguously pointing to the formation of a non-relativistic outflow with a kinetic energy of ≈ 4−10×1047 erg, a velocity of ≈ 12, 000 − 36, 000 km s−1 , and a mass of ≈ 3 × 10−5 − 7 × 10−4 M⊙. We show that the outflow was ejected on 2014 August 11–25, in agreement with an independent estimate of the timing of super-Eddington accretion based on the optical, UV, and X-ray observations, and that the ejected mass corresponds to about 1 − 10% of the mass accreted in the super-Eddington phase. The temporal evolution of the radio emission also uncovers the circumnuclear density profile, ρ(R) ∝ R−2.5 on a scale of about 0.01 pc, a scale that cannot be probed via direct measurements even in the nearest SMBHs. Our discovery of radio emission from the nearest well-studied TDE to date, with a radio luminosity lower than all previous limits, indicates that non-relativistic outflows are ubiquitous in TDEs, and that future, more sensitive, radio surveys will uncover similar events.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30498462
- FAS Scholarly Articles