Blob ejection from advection-dominated accretion flow: observational consequences

Abstract

There is increasing evidence for the presence of an optically thin advection-dominated accretion flow (ADAF) in low luminosity active galactic nuclei and radio-loud quasars. The present paper is devoted to explore the fate of a blob ejected from an ADAF, and to discuss its observational consequences. It is inevitable for the ejected blob to drastically expand into its surroundings. Consequently, it is expected that a group of relativistic electrons should be accelerated, which may lead to nonthermal flares, since a strong shock will be formed by the interaction between the blob and its surroundings. Then the blob cools down efficiently, leading to the appearance of recombination lines about $10^5$s after its ejection from an ADAF. We apply this model to NGC 4258 for some observational prediction, and to PKS 2149--306 for the explanation of observational evidence. Future simultaneous observations of recombination X-ray lines and continuum emission are highly desired to test the present model.

4 pages in emulateapj.sty, no figure. Accepted by ApJ Letters

References in corpus (6)

• Broad iron lines in Active Galactic Nuclei
• X-ray Spectra of a large sample of Quasars with ASCA
• Temporal and Spectral Variabilities of High Energy Emission from Blazars Using Synchrotron Self-Compton Models
• Electron Acceleration and Time Variability of High Energy Emission from Blazars
• A deep X-ray observation of NGC 4258 and its surrounding field
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• Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A${}^{\ast }$
• Blob Ejection from Advection-dominated Accretion Flow II: the Multiwavelength Properties of Light Curves
• The Additional Line Component within the Iron KαProfile in MCG-6-30-15: Evidence for Blob Ejection?