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.

Active galactic nucleus feedback in the hot halo of NGC 4649

Paggi, Alessandro;
2014-01-01

Abstract

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.
2014
Inglese
Esperti anonimi
787
2
1
12
12
https://iopscience.iop.org/article/10.1088/0004-637X/787/2/134/pdf
galaxies: individual (NGC 4649); galaxies: ISM; ISM: jets and outflows; X-rays: galaxies; X-rays: ISM; Astronomy and Astrophysics; Space and Planetary Science
STATI UNITI D'AMERICA
1 – prodotto con file in versione Open Access (allegherò il file al passo 6 - Carica)
262
7
Paggi, Alessandro; Fabbiano, Giuseppina; Kim, Dong-Woo; Pellegrini, Silvia; Civano, Francesca; Strader, Jay; Luo, Bin
info:eu-repo/semantics/article
reserved
03-CONTRIBUTO IN RIVISTA::03A-Articolo su Rivista
File in questo prodotto:
File Dimensione Formato  
Paggi_2014_ApJ_787_134.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 1.4 MB
Formato Adobe PDF
1.4 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1658693
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 15
social impact