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, 2017, vol. 472, No 2, p. 1659-1676. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stx2030. |
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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 and J. DE PLAA. Improved measurements of turbulence in the hot gaseous atmospheres of nearby giant elliptical galaxies. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2017, vol.~472, No~2, p.~1659-1676. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stx2030.
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