Signatures of Black Hole Accretion and outflows

Broadband Multiwavelength Emission of Low-luminosity AGNs

(or: how do supermassive black holes taking a nap look like?)

In order to probe the accretion and jet physical properties in low-luminosity active galactic nuclei as a class, I modeled the broadband radio to X-rays SEDs of 21 LINERs with a coupled ADAF-jet model (cf. figure; Nemmen et al. 2014, MNRAS; Mason et al 2014, ApJ; Nemmen et al. 2011, arXiv:1112.4640; Nemmen et al. 2006, ApJ, 643, 652). I found that the radio emission is severely underpredicted by ADAF models and is explained by the relativistic jet.

It is imperative to better observe and study/model this class of objects in all available wavelenghts, in order to better understand the complex physics at work. I have different projects aimed at advancing our understanding of supermassive black holes “taking a nap”, by making use of observations in different wavelenghts. I am also interested in computing new models of the electromagnetic signature of accreting black holes.

A cartoon version of the most favored scenario for the black hole accretion flow geometry and outflows in low-luminosity AGNs (Nemmen et al. 2014, MNRAS)
A cartoon version of the most favored scenario for the black hole accretion flow geometry and outflows in low-luminosity AGNs (Nemmen et al. 2014, MNRAS)
Example of spectral energy distribution model for NGC 1097, showing the emission from the ADAF (dashed), relativistic jet (dot-dash) and truncated thin disk (dotted) (Nemmen et al. 2011, 2014).
Example of spectral energy distribution model for NGC 1097, showing the emission from the ADAF (dashed), relativistic jet (dot-dash) and truncated thin disk (dotted) (Nemmen et al. 2011, 2014).

Optical Emission-lines From Accretion Disks and their Time-evolution

TODO

Spectral Energy Distributions of Luminous AGNs and Quasars

TODO

 

 

 

 

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