DISCOVERY OF AN OUTFLOW FROM RADIO OBSERVATIONS OF THE TIDAL DISRUPTION EVENT ASASSN-14li

被引：179

作者：

Alexander, K. D. ^{[1
]}

Berger, E. ^{[1
]}

Guillochon, J. ^{[1
]}

Zauderer, B. A. ^{[1
]}

Williams, P. K. G. ^{[1
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 819卷 / 02期

关键词：

accretion; accretion disks; black hole physics; galaxies: nuclei; radiation mechanisms: non-thermal; radio continuum: galaxies; relativistic processes; MASSIVE BLACK-HOLE; GAMMA-RAY BURSTS; STAR; JET; VARIABILITY; SUPERNOVAE; EMISSION; GALAXIES; BRIGHT; SCINTILLATION;

D O I：

10.3847/2041-8205/819/2/L25

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of transient radio emission from the nearby optically discovered tidal disruption event (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 approximate to(4-10) x 10(47) erg, a velocity of approximate to 12,000-36,000 km s(-1), and a mass of approximate to 3 x 10(-5)-7 x 10(-4) M-circle dot. 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, ultraviolet, 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, rho(R) proportional to R-2.5 on a scale of about 0.01 pc, a scale that cannot be probed via direct measurements even in the nearest supermassive black holes. 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.

引用

页数：10

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