Quantifying the energy flow from galactic black hole accretion disks into the intergalactic medium

Details Quantifying the energy flow from galactic black hole accretion disks into the intergalactic medium Quantifying the energy flow from galactic black hole accretion disks into the intergalactic medium

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11001k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Recent extragalactic radio and X-ray observations are able to quantify the energy transfer, via the BH accretion disk and jet, from galactic black holes to the intergalactic medium. We describe how these energies can now be directly estimated from both radio and X-ray data. Measurements show that galactic black holes inject approximately 10^61 ergs, about half of this in magnetic fields, into the largest observed radio galaxy lobes. Independently, recent black hole mass estimates show that the former is of order 10 % of the gravitational binding energy of the black hole. Yet another energy estimate can now be made from CHANDRA X-ray data which show, for galaxy clusters, the amount of energy dissipated as pdV work against the intracluster medium by the radio lobe expansion. These results point to a very efficient, but still ill-understood, mechanism for converting the enormous gravitational energy in galactic black holes into magnetic fields, cosmic rays, and hot thermal gas. We review near future prospects for extending and further quantifying the relevant observations.

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