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

A. Juráňová, N. Werner, M. Gaspari, K. Lakhchaura, P. E.J. Nulsen, M. Sun, R. E.A. Canning, S. W. Allen, A. Simionescu, J. B.R. Oonk, T. Connor, M. Donahue

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2886-2895
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume484
Issue number2
DOIs
Publication statusPublished - 2019

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halos
high temperature gases
galaxies
cooling
gas
x rays
condensation
permeating
condensing
harbors
XMM-Newton telescope
gases
newton
unity
filaments
entropy
vortices
orbits
eddy
turnover

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Juráňová, A., Werner, N., Gaspari, M., Lakhchaura, K., Nulsen, P. E. J., Sun, M., ... Donahue, M. (2019). Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049. Monthly Notices of the Royal Astronomical Society, 484(2), 2886-2895. https://doi.org/10.1093/mnras/stz185
Juráňová, A. ; Werner, N. ; Gaspari, M. ; 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. / Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 484, No. 2. pp. 2886-2895.
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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.",
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Juráňová, A, Werner, N, Gaspari, M, Lakhchaura, K, Nulsen, PEJ, Sun, M, Canning, REA, Allen, SW, Simionescu, A, Oonk, JBR, Connor, T & Donahue, M 2019, 'Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049' Monthly Notices of the Royal Astronomical Society, vol. 484, no. 2, pp. 2886-2895. https://doi.org/10.1093/mnras/stz185

Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049. / Juráňová, A.; Werner, N.; Gaspari, M.; 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, Vol. 484, No. 2, 2019, p. 2886-2895.

Research output: Contribution to journalArticle

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T1 - Cooling in the X-ray halo of the rotating, massive early-type galaxy NGC 7049

AU - Juráňová, A.

AU - Werner, N.

AU - Gaspari, M.

AU - Lakhchaura, K.

AU - Nulsen, P. E.J.

AU - Sun, M.

AU - Canning, R. E.A.

AU - Allen, S. W.

AU - Simionescu, A.

AU - Oonk, J. B.R.

AU - Connor, T.

AU - Donahue, M.

PY - 2019

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N2 - 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.

AB - 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.

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DO - 10.1093/mnras/stz185

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