There Goes the Neighborhood

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Science  21 Mar 2014:
Vol. 343, Issue 6177, pp. 1288
DOI: 10.1126/science.343.6177.1288-a

A mass-accreting black hole in steady-state cannot produce more radiative energy than its gravity can counterbalance, achieving what is known as the Eddington limit. However, mass accretion can also be converted into kinetic energy via mechanical outflow. Using x-ray observations, Soria et al. (p. 1330, published online 27 February; see the Perspective by King and the cover) identified a compact shock-ionized radio/optical nebula in spiral galaxy M83, powered by a black hole, inferred that the black hole emits a spherical wind that exceeds the Eddington limit tenfold and succeeded in estimating it's mass in the range of 5 to 15 solar masses. It is possible that rapidly accreting black holes have greater influence on their host galaxy than once appreciated.

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