An azimuthally resolved study of the cold front in Abell 3667

J 2017

An azimuthally resolved study of the cold front in Abell 3667

ICHINOHE, Y., A. SIMIONESCU, Norbert WERNER and T. TAKAHASHI

Basic information

Original name

An azimuthally resolved study of the cold front in Abell 3667

Authors

ICHINOHE, Y. (392 Japan), A. SIMIONESCU (642 Romania), Norbert WERNER (703 Slovakia, guarantor, belonging to the institution) and T. TAKAHASHI (392 Japan)

Edition

Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL URL

Impact factor

Impact factor: 5.194

RIV identification code

RIV/00216224:14310/17:00096516

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1093/mnras/stx280

UT WoS

000398419400091

Keywords in English

galaxies: clusters: individual: Abell 3667; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters

Abstract

V originále

The microphysical properties, such as effective viscosity and conductivity, of the weakly magnetized intergalactic plasma are not yet well known. We investigate the constraints that can be placed by an azimuthally resolved study of the cold front in Abell 3667 using similar to 500 ks archival Chandra data. We find that the radius of the interface fluctuates with position angle and the morphology of the interface is strikingly similar to recent numerical simulations of inviscid gas-stripping. We find multiple edges in the surface brightness profiles across the cold front as well as azimuthal variations, which are consistent with the presence of Kelvin-Helmholtz instabilities (KHIs) developing along the cold front. They indicate that the characteristic length-scale of KHI rolls is around 20-80 kpc. This is the first observational indication of developing KHIs along a merger cold front in a galaxy cluster. Based on the KHI scenario, we estimated the upper limit of the intracluster medium effective viscosity. The estimated value of mu less than or similar to 200 g cm(-1) s(-1) is at most 5 per cent of the isotropic Spitzer-like viscosity. The observed apparent mixing towards the outer edges away from the tip of the front provides an additional evidence for suppressed viscosity.

Citovat

ICHINOHE, Y., A. SIMIONESCU, Norbert WERNER and T. TAKAHASHI. An azimuthally resolved study of the cold front in Abell 3667. Monthly Notices of the Royal Astronomical Society. Oxford: OXFORD UNIV PRESS, 2017, vol. 467, No 3, p. 3662-3676. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stx280.

@article{1378749,
   author = {Ichinohe, Y. and Simionescu, A. and Werner, Norbert and Takahashi, T.},
   article_location = {Oxford},
   article_number = {3},
   doi = {http://dx.doi.org/10.1093/mnras/stx280},
   keywords = {galaxies: clusters: individual: Abell 3667; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {An azimuthally resolved study of the cold front in Abell 3667},
   url = {https://academic.oup.com/mnras/article/467/3/3662/2966034},
   volume = {467},
   year = {2017}
}

TY  - JOUR
ID  - 1378749
AU  - Ichinohe, Y. - Simionescu, A. - Werner, Norbert - Takahashi, T.
PY  - 2017
TI  - An azimuthally resolved study of the cold front in Abell 3667
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 467
IS  - 3
SP  - 3662-3676
EP  - 3662-3676
PB  - OXFORD UNIV PRESS
SN  - 00358711
KW  - galaxies: clusters: individual: Abell 3667
KW  - galaxies: clusters: intracluster medium
KW  - X-rays: galaxies: clusters
UR  - https://academic.oup.com/mnras/article/467/3/3662/2966034
N2  - The microphysical properties, such as effective viscosity and conductivity, of the weakly magnetized intergalactic plasma are not yet well known. We investigate the constraints that can be placed by an azimuthally resolved study of the cold front in Abell 3667 using similar to 500 ks archival Chandra data. We find that the radius of the interface fluctuates with position angle and the morphology of the interface is strikingly similar to recent numerical simulations of inviscid gas-stripping. We find multiple edges in the surface brightness profiles across the cold front as well as azimuthal variations, which are consistent with the presence of Kelvin-Helmholtz instabilities (KHIs) developing along the cold front. They indicate that the characteristic length-scale of KHI rolls is around 20-80 kpc. This is the first observational indication of developing KHIs along a merger cold front in a galaxy cluster. Based on the KHI scenario, we estimated the upper limit of the intracluster medium effective viscosity. The estimated value of mu less than or similar to 200 g cm(-1) s(-1) is at most 5 per cent of the isotropic Spitzer-like viscosity. The observed apparent mixing towards the outer edges away from the tip of the front provides an additional evidence for suppressed viscosity.
ER  -

ICHINOHE, Y., A. SIMIONESCU, Norbert WERNER and T. TAKAHASHI. An azimuthally resolved study of the cold front in Abell 3667. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2017, vol.~467, No~3, p.~3662-3676. ISSN~0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stx280.

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