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Related papers: On conduction, cooling flows and galaxy formation

200 papers

I study non-radiative cooling of X-ray emitting gas via heat conduction along magnetic field lines inside magnetic flux loops in cooling flow clusters of galaxies. I find that such heat conduction can reduce the fraction of energy radiated…

Astrophysics · Physics 2009-11-10 Noam Soker

We present a spectral analysis of cool and cooling gas in 45 cool-core clusters and groups of galaxies obtained from Reflection Grating Spectrometer (RGS) XMM-$Newton$ observations. The high-resolution spectra show FeXVII emission in many…

High Energy Astrophysical Phenomena · Physics 2019-02-20 Haonan Liu , Ciro Pinto , Andrew C. Fabian , Helen R. Russell , Jeremy S. Sanders

Unopposed radiative cooling in clusters of galaxies results in excessive mass deposition rates. However, the cool cores of galaxy clusters are continuously heated by thermal conduction and turbulent heat diffusion due to minor mergers or…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 M. Ruszkowski , S. Peng Oh

(abridged) Uninhibited radiative cooling in clusters of galaxies would lead to excessive mass accretion rates contrary to observations. One of the key proposals to offset radiative energy losses is thermal conduction from outer, hotter…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 M. Ruszkowski , S. Peng Oh

Galaxy clusters are filled with hot, diffuse X-ray emitting plasma, with a stochastically tangled magnetic field whose energy is close to equipartition with the energy of the turbulent motions \cite{zweibel1997, Vacca}. In the cluster…

We examine the long-standing cooling flow problem in galaxy clusters with 3D MHD simulations of isolated clusters including radiative cooling and anisotropic thermal conduction along magnetic field lines. The central regions of the…

Cosmology and Nongalactic Astrophysics · Physics 2009-09-28 Ian J. Parrish , Eliot Quataert , Prateek Sharma

We consider a model of galaxy clusters in which the hot gas is in hydrostatic equilibrium and maintains energy balance between radiative cooling and heating by thermal conduction. We analyze the thermal stability of the gas using a…

Astrophysics · Physics 2009-11-07 Woong-Tae Kim , Ramesh Narayan

The gas in the cores of many clusters and groups of galaxies has a short radiative cooling time. Energy from the central black hole is observed to flow into this gas by means of jets, bubbles and sound waves. Cooling is thus offset by…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 A. C. Fabian , J. S. Sanders

In many clusters of galaxies there is evidence for cooling flows which deposit large quantities of cool gas in the central regions. A fraction of this gas might accumulate as dense cool clouds. The aim of this communication is to discuss…

Astrophysics · Physics 2007-05-23 L. Grenacher , Ph. Jetzer , D. Puy

The results of hydrodynamic simulations of the Virgo and Perseus clusters suggest that thermal conduction is not responsible for the observed temperature and density profiles. As a result it seems that thermal conduction occurs at a much…

Astrophysics · Physics 2007-05-23 Edward Pope , Christian Kaiser , Georgi Pavlovski , Hans Fangohr

The discrepancy between expected and observed cooling rates of X-ray emitting gas has led to the {\it cooling flow problem} at the cores of clusters of galaxies. A variety of models have been proposed to model the observed X-ray spectra and…

Astrophysics of Galaxies · Physics 2019-10-15 Mohammad H. Zhoolideh Haghighi , Niayesh Afshordi , Habib. G. Khosroshahi

We present a new scenario for the formation of cool cores in rich galaxy clusters based on results from recent high spatial dynamic range, adaptive mesh Eulerian hydrodynamic simulations of large-scale structure formation. We find that…

Astrophysics · Physics 2008-11-26 Patrick M. Motl , Jack O. Burns , Chris Loken , Michael L. Norman , Greg Bryan

(Abridged) Cold fronts in cluster cool cores should be erased on short timescales by thermal conduction, unless protected by magnetic fields that are "draped" parallel to the front surfaces, suppressing conduction perpendicular to the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 J. A. ZuHone , M. Markevitch , M. Ruszkowski , D. Lee

Thermal conduction in tangled magnetic fields is reduced because heat conducting electrons must travel along the field lines longer distances between hot and cold regions of space than if there were no fields. We consider the case when the…

Astrophysics · Physics 2009-10-31 Leonid Malyshkin

The radiative cooling time of hot gas in the cool cores of many galaxy clusters and massive elliptical galaxies drops in the centre to below 100 million years. The mass cooling rates inferred from simple modelling of X-ray observations of…

Astrophysics of Galaxies · Physics 2024-11-07 L. R. Ivey , A. C. Fabian , J. S. Sanders , C. Pinto , G. J. Ferland , S. Walker , J. Jiang

The role of thermal conduction in regulating the thermal behavior of cooling flows in galaxy clusters is reexamined. Recent investigations have shown that the anisotropic Coulomb heat flux caused by a magnetic field in a dilute plasma…

Astrophysics · Physics 2009-11-13 Steven A. Balbus , Christopher S. Reynolds

Cooling flows are common in galaxy clusters which have cool cores. The soft X-ray emission below 1 keV from the flows is mostly absorbed by cold dusty gas within the central cooling sites. Further evidence for this process is presented here…

In the centers of many galaxy clusters, the hot ($\sim$10$^7$ K) intracluster medium (ICM) can become dense enough that it should cool on short timescales. However, the low measured star formation rates in massive central galaxies and…

Recent X-ray observations have revealed a universal temperature profile of the intracluster gas of non-cooling flow clusters which is flat for r \le 0.2 r_{180}. Numerical simulations, however, obtain a steeper temperature profile in the…

Astrophysics · Physics 2009-11-07 Biman B. Nath

We use Chandra data to derive a detailed gas temperature map of the nearby, hot, merging galaxy cluster A754. Combined with the X-ray and optical images, the map reveals a more complex merger geometry than previously thought, possibly…