NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-22 T09:34:58 PDT
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For refcode 2018ApJ...862...39B:
Retrieve 38 NED objects in this reference.
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2018ApJ...862...39B A Universal Entropy Profile for the Hot Atmospheres of Galaxies and Clusters within R_2500_ Babyk, Iu. V.; McNamara, B. R.; Nulsen, P. E. J.; Russell, H. R.; Vantyghem, A. N.; Hogan, M. T.; Pulido, F. A. Abstract. We present atmospheric gas entropy profiles for 40 early-type galaxies and 110 clusters spanning several decades of halo mass, atmospheric gas mass, radio jet power, and galaxy type. We show that within ~0.1R_2500_ the entropy profiles of low-mass systems, including ellipticals, brightest cluster galaxies, and spiral galaxies, scale approximately as K is proportional to R ^2/3^. Beyond ~0.1R_2500_ entropy profiles are slightly shallower than the K is proportional to R ^1.1^ profile expected from gravitational collapse alone, indicating that heating by active galactic nuclei (AGN) feedback extends well beyond the central galaxy. We show that the K is proportional to R ^2/3^ entropy profile shape indicates that thermally unstable cooling is balanced by heating where the inner cooling and free-fall timescales approach a constant ratio. Hot atmospheres of elliptical galaxies have a higher rate of heating per gas particle compared to those of central cluster galaxies. This excess heating may explain why some central cluster galaxies are forming stars while most early-type galaxies have experienced no significant star formation for billions of years. We show that the entropy profiles of six lenticular and spiral galaxies follow the R ^2/3^ form. The continuity between central galaxies in clusters, giant ellipticals, and spirals suggests perhaps that processes heating the atmospheres of elliptical and brightest cluster galaxies are also active in spiral galaxies. Key words: galaxies: clusters: general, galaxies: clusters: intracluster medium
Retrieve 38 NED objects in this reference.
Please click here for ADS abstract

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