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The highest frequency detection of a radio relic: 16 GHz AMI observations of the 'Sausage' cluster

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The highest frequency detection of a radio relic : 16 GHz AMI observations of the 'Sausage' cluster. / Stroe, Andra; Rumsey, Clare; Harwood, Jeremy J.; Van weeren, Reinout J.; Röttgering, Huub J. A.; Saunders, Richard D. E.; Sobral, David; Perrott, Yvette C.; Schammel, Michel P.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 441, No. 1, slu045, 11.06.2014, p. L41-L45.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Stroe, A, Rumsey, C, Harwood, JJ, Van weeren, RJ, Röttgering, HJA, Saunders, RDE, Sobral, D, Perrott, YC & Schammel, MP 2014, 'The highest frequency detection of a radio relic: 16 GHz AMI observations of the 'Sausage' cluster', Monthly Notices of the Royal Astronomical Society: Letters, vol. 441, no. 1, slu045, pp. L41-L45. https://doi.org/10.1093/mnrasl/slu045

APA

Stroe, A., Rumsey, C., Harwood, J. J., Van weeren, R. J., Röttgering, H. J. A., Saunders, R. D. E., Sobral, D., Perrott, Y. C., & Schammel, M. P. (2014). The highest frequency detection of a radio relic: 16 GHz AMI observations of the 'Sausage' cluster. Monthly Notices of the Royal Astronomical Society: Letters, 441(1), L41-L45. [slu045]. https://doi.org/10.1093/mnrasl/slu045

Vancouver

Stroe A, Rumsey C, Harwood JJ, Van weeren RJ, Röttgering HJA, Saunders RDE et al. The highest frequency detection of a radio relic: 16 GHz AMI observations of the 'Sausage' cluster. Monthly Notices of the Royal Astronomical Society: Letters. 2014 Jun 11;441(1):L41-L45. slu045. https://doi.org/10.1093/mnrasl/slu045

Author

Stroe, Andra ; Rumsey, Clare ; Harwood, Jeremy J. ; Van weeren, Reinout J. ; Röttgering, Huub J. A. ; Saunders, Richard D. E. ; Sobral, David ; Perrott, Yvette C. ; Schammel, Michel P. / The highest frequency detection of a radio relic : 16 GHz AMI observations of the 'Sausage' cluster. In: Monthly Notices of the Royal Astronomical Society: Letters. 2014 ; Vol. 441, No. 1. pp. L41-L45.

Bibtex

@article{24c11e490b414581806cd299ab5883c2,
title = "The highest frequency detection of a radio relic: 16 GHz AMI observations of the 'Sausage' cluster",
abstract = "We observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16 GHz and present the first high radio-frequency detection of diffuse, non-thermal cluster emission. This cluster hosts a variety of bright, extended, steep-spectrum synchrotron-emitting radio sources, associated with the intracluster medium, called radio relics. Most notably, the northern, Mpc-wide, narrow relic provides strong evidence for diffusive shock acceleration in clusters. We detect a puzzling, flat-spectrum, diffuse extension of the southern relic, which is not visible in the lower radio-frequency maps. The northern radio relic is unequivocally detected and measures an integrated flux of 1.2 ± 0.3 mJy. While the low-frequency (<2 GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16 GHz. This result is inconsistent with diffusive shock acceleration predictions of ageing plasma behind a uniform shock front. The steepening could be caused by an inhomogeneous medium with temperature/density gradients or by lower acceleration efficiencies of high energy electrons. Further modelling is necessary to explain the observed spectrum.",
keywords = "Acceleration of particles, Radiation mechanisms: Non-thermal, Radio continuum: General, Shock waves, galaxies: clusters: individual: CIZA J2242.8+5301",
author = "Andra Stroe and Clare Rumsey and Harwood, {Jeremy J.} and {Van weeren}, {Reinout J.} and R{\"o}ttgering, {Huub J. A.} and Saunders, {Richard D. E.} and David Sobral and Perrott, {Yvette C.} and Schammel, {Michel P.}",
year = "2014",
month = jun,
day = "11",
doi = "10.1093/mnrasl/slu045",
language = "English",
volume = "441",
pages = "L41--L45",
journal = "Monthly Notices of the Royal Astronomical Society: Letters",
issn = "1745-3925",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - The highest frequency detection of a radio relic

T2 - 16 GHz AMI observations of the 'Sausage' cluster

AU - Stroe, Andra

AU - Rumsey, Clare

AU - Harwood, Jeremy J.

AU - Van weeren, Reinout J.

AU - Röttgering, Huub J. A.

AU - Saunders, Richard D. E.

AU - Sobral, David

AU - Perrott, Yvette C.

AU - Schammel, Michel P.

PY - 2014/6/11

Y1 - 2014/6/11

N2 - We observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16 GHz and present the first high radio-frequency detection of diffuse, non-thermal cluster emission. This cluster hosts a variety of bright, extended, steep-spectrum synchrotron-emitting radio sources, associated with the intracluster medium, called radio relics. Most notably, the northern, Mpc-wide, narrow relic provides strong evidence for diffusive shock acceleration in clusters. We detect a puzzling, flat-spectrum, diffuse extension of the southern relic, which is not visible in the lower radio-frequency maps. The northern radio relic is unequivocally detected and measures an integrated flux of 1.2 ± 0.3 mJy. While the low-frequency (<2 GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16 GHz. This result is inconsistent with diffusive shock acceleration predictions of ageing plasma behind a uniform shock front. The steepening could be caused by an inhomogeneous medium with temperature/density gradients or by lower acceleration efficiencies of high energy electrons. Further modelling is necessary to explain the observed spectrum.

AB - We observed the cluster CIZA J2242.8+5301 with the Arcminute Microkelvin Imager at 16 GHz and present the first high radio-frequency detection of diffuse, non-thermal cluster emission. This cluster hosts a variety of bright, extended, steep-spectrum synchrotron-emitting radio sources, associated with the intracluster medium, called radio relics. Most notably, the northern, Mpc-wide, narrow relic provides strong evidence for diffusive shock acceleration in clusters. We detect a puzzling, flat-spectrum, diffuse extension of the southern relic, which is not visible in the lower radio-frequency maps. The northern radio relic is unequivocally detected and measures an integrated flux of 1.2 ± 0.3 mJy. While the low-frequency (<2 GHz) spectrum of the northern relic is well represented by a power law, it clearly steepens towards 16 GHz. This result is inconsistent with diffusive shock acceleration predictions of ageing plasma behind a uniform shock front. The steepening could be caused by an inhomogeneous medium with temperature/density gradients or by lower acceleration efficiencies of high energy electrons. Further modelling is necessary to explain the observed spectrum.

KW - Acceleration of particles

KW - Radiation mechanisms: Non-thermal

KW - Radio continuum: General

KW - Shock waves

KW - galaxies: clusters: individual: CIZA J2242.8+5301

U2 - 10.1093/mnrasl/slu045

DO - 10.1093/mnrasl/slu045

M3 - Journal article

AN - SCOPUS:84899917838

VL - 441

SP - L41-L45

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

M1 - slu045

ER -