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.

Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049 / 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.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 484:2(2019), pp. 2886-2895. [10.1093/mnras/stz185]

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

GASPARI, MASSIMO;
2019

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.
2019
484
2
2886
2895
Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049 / 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.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 484:2(2019), pp. 2886-2895. [10.1093/mnras/stz185]
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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1338418
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