Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00109494" target="_blank" >RIV/00216224:14310/19:00109494 - isvavai.cz</a>
Result on the web
<a href="https://ui.adsabs.harvard.edu/abs/2019MNRAS.484.2886J/abstract" target="_blank" >https://ui.adsabs.harvard.edu/abs/2019MNRAS.484.2886J/abstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stz185" target="_blank" >10.1093/mnras/stz185</a>

Result language
angličtina
Original language name
Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049
Original language description
The relative importance of the physical processes shaping the thermodynamics of the hot gas permeating rotating, massive early-type galaxies is expected to be different from that in non-rotating systems. Here, we report the results of the analysis of XMM Newton data for the massive, lenticular galaxy NGC 7049. The galaxy harbours a dusty disc of cool gas and is surrounded by an extended hot X-ray emitting gaseous atmosphere with unusually high central entropy. The hot gas in the plane of rotation of the cool dusty disc has a multitemperature structure, consistent with ongoing cooling. We conclude that the rotational support of the hot gas is likely capable of altering the multiphase condensation regardless of the t(cool)/t(ff) ratio, which is here relatively high, similar to 40. However, the measured ratio of cooling time and eddy turnover time around unity (C-ratio approximate to 1) implies significant condensation, and at the same time, the constrained ratio of rotational velocity and the velocity dispersion (turbulent Taylor number) Ta-t > 1 indicates that the condensing gas should follow non-radial orbits forming a disc instead of filaments. This is in agreement with hydrodynamical simulations of massive rotating galaxies predicting a similarly extended multiphase disc.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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