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http://hdl.handle.net/20.500.12386/29240
Titolo: | Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049 | Autori: | Juráňová, A. Werner, N. GASPARI, MASSIMO Lakhchaura, K. Nulsen, P. E. J. Sun, M. Canning, R. E. A. Allen, S. W. Simionescu, A. Oonk, J. B. R. Connor, T. Donahue, M. |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 484 | Fascicolo: | 2 | Da pagina:: | 2886 | Abstract: | 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, ∼40. However, the measured ratio of cooling time and eddy turnover time around unity (C-ratio ≈ 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. | URI: | http://hdl.handle.net/20.500.12386/29240 | URL: | https://academic.oup.com/mnras/article/484/2/2886/5290333 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz185 | Bibcode ADS: | 2019MNRAS.484.2886J | Fulltext: | open |
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