OGORZALEK, A., I. ZHURAVLEVA, S. W. ALLEN, C. PINTO, Norbert WERNER, A. MANTZ, R. CANNING, A. C. FABIAN, J. S. KAASTRA and J. DE PLAA. Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies. Monthly Notices of the Royal Astronomical Society. Oxford: OXFORD UNIV PRESS, vol. 472, No 2, p. 1659-1676. ISSN 0035-8711. doi:10.1093/mnras/stx2030. 2017.
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Basic information
Original name Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies
Authors OGORZALEK, A. (616 Poland), I. ZHURAVLEVA (643 Russian Federation), S. W. ALLEN (826 United Kingdom of Great Britain and Northern Ireland), C. PINTO (380 Italy), Norbert WERNER (703 Slovakia, guarantor, belonging to the institution), A. MANTZ (840 United States of America), R. CANNING (826 United Kingdom of Great Britain and Northern Ireland), A. C. FABIAN (826 United Kingdom of Great Britain and Northern Ireland), J. S. KAASTRA (528 Netherlands) and J. DE PLAA (528 Netherlands).
Edition Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
WWW URL URL
Impact factor Impact factor: 5.194
RIV identification code RIV/00216224:14310/17:00099804
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1093/mnras/stx2030
UT WoS 000413082900032
Keywords in English radiative transfer; turbulence; techniques: spectroscopic; galaxies: clusters: intracluster medium; galaxies: kinematics and dynamics; X-rays: galaxies: clusters
Tags NZ, rivok
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 10/11/2022 13:06.
Abstract
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.
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