Heating Hot Atmospheres with Active Galactic Nuclei
Brian R. McNamara,Paul Nulsen +1 more
TLDR
In this paper, high-resolution X-ray spectroscopy of the hot gas in galaxy clusters has shown that the gas is not cooling to low temperatures at the predicted rates of hundreds to thousands of solar masses per year.Abstract:
High resolution X-ray spectroscopy of the hot gas in galaxy clusters has shown that the gas is not cooling to low temperatures at the predicted rates of hundreds to thousands of solar masses per year. X-ray images have revealed giant cavities and shock fronts in the hot gas that provide a direct and relatively reliable means of measuring the energy injected into hot atmospheres by active galactic nuclei (AGN). Average radio jet powers are near those required to offset radiative losses and to suppress cooling in isolated giant elliptical galaxies, and in larger systems up to the richest galaxy clusters. This coincidence suggests that heating and cooling are coupled by feedback, which suppresses star formation and the growth of luminous galaxies. How jet energy is converted to heat and the degree to which other heating mechanisms are contributing, eg. thermal conduction, are not well understood. Outburst energies require substantial late growth of supermassive black holes. Unless all of the approximately 10E62 erg required to suppress star formation is deposited in the cooling regions of clusters, AGN outbursts must alter large-scale properties of the intracluster medium.read more
Citations
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Journal ArticleDOI
Observational Evidence of Active Galactic Nuclei Feedback
TL;DR: In this article, it was shown that the radiative or quasar mode of feedback can account for the observed proportionality between the central black hole and the host galaxy mass, which can lead to ejection or heating of the gas.
Posted Content
Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies: Supplemental Material
John Kormendy,Luis C. Ho +1 more
TL;DR: Kormendy and Ho as mentioned in this paper proposed a method to estimate the BH masses for galaxies with active nuclei (AGNs) based on the observational criteria that are used to classify classical and pseudo bulges.
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A semi-analytic model for the co-evolution of galaxies, black holes and active galactic nuclei
TL;DR: In this paper, a semi-analytic model that self-consistently traces the growth of supermassive black holes and their host galaxies within the context of the Lambda cold dark matter (� CDM) cosmological framework is presented.
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From dwarf spheroidals to cD galaxies: simulating the galaxy population in a ΛCDM cosmology
Qi Guo,Simon D. M. White,Michael Boylan-Kolchin,Gabriella De Lucia,Guinevere Kauffmann,Gerard Lemson,Cheng Li,Volker Springel,Simone M. Weinmann +8 more
TL;DR: In this paper, a semi-analytic galaxy formation model was proposed and applied to the stored halo/subhalo merger trees of the Millennium and Millennium-II simulations, allowing explicit testing of resolution effects on predicted galaxy properties.
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Giant gamma-ray bubbles from fermi-lat: active galactic nucleus activity or bipolar galactic wind?
TL;DR: The gamma-ray emission associated with these bubbles has a significantly harder spectrum (dN/dE ~ E 2) than the inverse Compton emission from electrons in the Galactic disk, or the gamma rays produced by the decay of pions from proton-interstellar medium collisions.
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