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.

doi:10.1093/mnras/stz185

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

Journal Article · 16 January 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz185 · OSTI ID:1529233

^[1]; Werner, N. ^[2];

^[3]; Lakhchaura, K. ^[4]; Nulsen, P. E. J. ^[5]; Sun, M. ^[6]; Canning, R. E. A. ^[7]; Allen, S. W. ^[8];

^[9]; Oonk, J. B. R. ^[10]; Connor, T. ^[11]; Donahue, M. ^[12]

Masaryk Univ., Brno (Czech Republic)
Masaryk Univ., Brno (Czech Republic); MTA-Eotvos Lorand Univ. Lendulet Hot Universe Research Group, Budapest (Hungary); Hiroshima Univ., Higashi-Hiroshima (Japan)
Princeton Univ., Princeton, NJ (United States)
MTA-Eotvos Lorand Univ. Lendulet Hot Universe Research Group, Budapest (Hungary)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Univ. of Western Australia, Crawley, WA (Australia)
Univ. of Alabama in Huntsville, Huntsville, AL (United States)
Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
SRON Netherlands Institute for Space Research, Utrecht (The Netherlands); Leiden Univ., Leiden (The Netherlands)
Leiden Univ., Leiden (The Netherlands); ASTRON, Netherlands Institute for Radio Astronomy, Dwingeloo (The Netherlands)
The Observatories of the Carnegie Institution for Science, Pasadena, CA (United States)
Michigan State Univ., East Lansing, MI (United States)

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. Furthermore, this is in agreement with hydrodynamical simulations of massive rotating galaxies predicting a similarly extended multiphase disc.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1529233

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 484; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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The effects of galaxy shape and rotation on the X-ray haloes of early-type galaxies - II. Numerical simulations Negri, Andrea; Posacki, Silvia; Pellegrini, Silvia arXiv https://doi.org/10.48550/arxiv.1406.0008	text	January 2014
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Thermodynamic properties, multiphase gas and AGN feedback in a large sample of giant ellipticals Lakhchaura, K.; Werner, N.; Sun, M. arXiv https://doi.org/10.48550/arxiv.1806.00455	text	January 2018
The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances Tonry, John L.; Dressler, Alan; Blakeslee, John P. arXiv https://doi.org/10.48550/arxiv.astro-ph/0011223	text	January 2000
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