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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29240
Title: Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049
Authors: 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.
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 484
Issue: 2
First Page: 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
Appears in Collections:1.01 Articoli in rivista

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