| OGORZALEK, A., I. ZHURAVLEVA, S. W. ALLEN, C. PINTO, Norbert WERNER, A. MANTZ, R. CANNING, A. C. FABIAN, J. S. KAASTRA a J. DE PLAA. Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies. Online. Monthly Notices of the Royal Astronomical Society. Oxford: OXFORD UNIV PRESS, 2017, roč. 472, č. 2, s. 1659-1676. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stx2030. [citováno 2024-04-24] |
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@article{1406171,
author = {Ogorzalek, A. and Zhuravleva, I. and Allen, S. W. and Pinto, C. and Werner, Norbert and Mantz, A. and Canning, R. and Fabian, A. C. and Kaastra, J. S. and de Plaa, J.},
article_location = {Oxford},
article_number = {2},
doi = {http://dx.doi.org/10.1093/mnras/stx2030},
keywords = {radiative transfer; turbulence; techniques: spectroscopic; galaxies: clusters: intracluster medium; galaxies: kinematics and dynamics; X-rays: galaxies: clusters},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies},
url = {https://academic.oup.com/mnras/article/472/2/1659/4082088},
volume = {472},
year = {2017}
}
TY - JOUR
ID - 1406171
AU - Ogorzalek, A. - Zhuravleva, I. - Allen, S. W. - Pinto, C. - Werner, Norbert - Mantz, A. - Canning, R. - Fabian, A. C. - Kaastra, J. S. - de Plaa, J.
PY - 2017
TI - Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies
JF - Monthly Notices of the Royal Astronomical Society
VL - 472
IS - 2
SP - 1659-1676
EP - 1659-1676
PB - OXFORD UNIV PRESS
SN - 00358711
KW - radiative transfer
KW - turbulence
KW - techniques: spectroscopic
KW - galaxies: clusters: intracluster medium
KW - galaxies: kinematics and dynamics
KW - X-rays: galaxies: clusters
UR - https://academic.oup.com/mnras/article/472/2/1659/4082088
N2 - We present significantly improved measurements of turbulent velocities in the hot gaseous haloes of nearby giant elliptical galaxies. Using deep XMM-Newton Reflection Grating Spectrometer (RGS) observations and a combination of resonance scattering and direct line broadening methods, we obtain well bounded constraints for 13 galaxies. Assuming that the turbulence is isotropic, we obtain a best-fitting mean 1D turbulent velocity of similar to 110 km s(-1). This implies a typical 3D Mach number similar to 0.45 and a typical non-thermal pressure contribution of similar to 6 per cent in the cores of nearby massive galaxies. The intrinsic scatter around these values is modest-consistent with zero, albeit with large statistical uncertainty-hinting at a common and quasi-continuous mechanism sourcing the velocity structure in these objects. Using conservative estimates of the spatial scales associated with the observed turbulent motions, we find that turbulent heating can be sufficient to offset radiative cooling in the inner regions of these galaxies (< 10 kpc, typically 2-3 kpc). The full potential of our analysis methods will be enabled by future X-ray micro-calorimeter observations.
ER -
OGORZALEK, A., I. ZHURAVLEVA, S. W. ALLEN, C. PINTO, Norbert WERNER, A. MANTZ, R. CANNING, A. C. FABIAN, J. S. KAASTRA a J. DE PLAA. Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies. Online. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2017, roč.~472, č.~2, s.~1659-1676. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stx2030. [citováno 2024-04-24]
|
