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Title: Active galactic nucleus feedback in the hot halo of NGC 4649

Using the deepest available Chandra observations of NGC 4649, we find strong evidences of cavities, ripples, and ring-like structures in the hot interstellar medium that appear to be morphologically related with the central radio emission. These structures show no significant temperature variations in correspondence with higher pressure regions (0.5 kpc < r < 3 kpc). On the same spatial scale, a discrepancy between the mass profiles obtained from stellar dynamic and Chandra data represents the telltale evidence of a significant nonthermal pressure component in this hot gas, which is related to the radio jet and lobes. On a larger scale we find agreement between the mass profile obtained from Chandra data and planetary nebulae and globular cluster dynamics. The nucleus of NGC 4649 appears to be extremely radiatively inefficient, with highly sub-Bondi accretion flow. Consistent with this finding, the jet power evaluated from the observed X-ray cavities implies that a small fraction of the accretion power calculated for the Bondi mass accretion rate emerges as kinetic energy. Comparing the jet power to radio and nuclear X-ray luminosity, the observed cavities show behavior similar to those of other giant elliptical galaxies.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Department of Astronomy, University of Bologna, Via Ranzani 1, I-40127 Bologna (Italy)
  3. Department of Physics and Yale Center for Astronomy and Astrophysics, Yale University, P.O. Box 208121, New Haven, CT 06520-8121 (United States)
  4. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
  5. Department of Astronomy and Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
22356778
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 787; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EMISSION; FEEDBACK; GALAXY NUCLEI; KINETIC ENERGY; LUMINOSITY; MASS; PLANETARY NEBULAE; PRESSURE RANGE MEGA PA 10-100; X RADIATION; X-RAY GALAXIES