A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec ‘mini’-halo in a sloshing cool-core cluster
Abstract
ABSTRACT Radio mini-haloes are poorly understood, moderately extended diffuse radio sources that trace the presence of magnetic fields and relativistic electrons on scales of hundreds of kiloparsecs, predominantly in relaxed clusters. With relatively few confirmed detections to-date, many questions remain unanswered. This paper presents new radio observations of the galaxy cluster MS 1455.0+2232 performed with MeerKAT (covering the frequency range 872−1712 MHz) and LOFAR (covering 120−168 MHz), the first results from a homogeneously selected mini-halo census. We find that this mini-halo extends for ∼590 kpc at 1283 MHz, significantly larger than previously believed, and has a flatter spectral index (α = −0.97 ± 0.05) than typically expected. Our X-ray analysis clearly reveals a large-scale (254 kpc) sloshing spiral in the intracluster medium. We perform a point-to-point analysis, finding a tight single correlation between radio and X-ray surface brightness with a super-linear slope of $$b_{\rm 1283\, MHz} = 1.16^{+0.06}_{-0.07}$$ and $$b_{\rm 145\, MHz} = 1.15^{+0.09}_{-0.08}$$; this indicates a strong link between the thermal and non-thermal components of the intracluster medium. Conversely, in the spectral index/X-ray surface brightness plane, we find that regions inside and outside the sloshing spiral follow different correlations. We find compelling evidence for multiple sub-components in this mini-halo for the first time. While both the turbulent (re-)acceleration and hadronic scenarios are able to explain some observed properties of the mini-halo in MS 1455.0+2232, neither scenario is able to account for all the evidence presented by our analysis.
- Publication Date:
- Research Org.:
- US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1861464
- Alternate Identifier(s):
- OSTI ID: 1982691
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 512 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; cluster galaxies; individual cluster MS 1455.0+2232; intracluster medium galaxies; radio continuum; cluster galaxy x-rays
Citation Formats
Riseley, C. J., Rajpurohit, K., Loi, F., Botteon, A., Timmerman, R., Biava, N., Bonafede, A., Bonnassieux, E., Brunetti, G., Enßlin, T., Di Gennaro, G., Ignesti, A., Shimwell, T., Stuardi, C., Vernstrom, T., and van Weeren, R. J. A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec ‘mini’-halo in a sloshing cool-core cluster. United Kingdom: N. p., 2022.
Web. doi:10.1093/mnras/stac672.
Riseley, C. J., Rajpurohit, K., Loi, F., Botteon, A., Timmerman, R., Biava, N., Bonafede, A., Bonnassieux, E., Brunetti, G., Enßlin, T., Di Gennaro, G., Ignesti, A., Shimwell, T., Stuardi, C., Vernstrom, T., & van Weeren, R. J. A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec ‘mini’-halo in a sloshing cool-core cluster. United Kingdom. https://doi.org/10.1093/mnras/stac672
Riseley, C. J., Rajpurohit, K., Loi, F., Botteon, A., Timmerman, R., Biava, N., Bonafede, A., Bonnassieux, E., Brunetti, G., Enßlin, T., Di Gennaro, G., Ignesti, A., Shimwell, T., Stuardi, C., Vernstrom, T., and van Weeren, R. J. Fri .
"A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec ‘mini’-halo in a sloshing cool-core cluster". United Kingdom. https://doi.org/10.1093/mnras/stac672.
@article{osti_1861464,
title = {A MeerKAT-meets-LOFAR study of MS 1455.0 + 2232: a 590 kiloparsec ‘mini’-halo in a sloshing cool-core cluster},
author = {Riseley, C. J. and Rajpurohit, K. and Loi, F. and Botteon, A. and Timmerman, R. and Biava, N. and Bonafede, A. and Bonnassieux, E. and Brunetti, G. and Enßlin, T. and Di Gennaro, G. and Ignesti, A. and Shimwell, T. and Stuardi, C. and Vernstrom, T. and van Weeren, R. J.},
abstractNote = {ABSTRACT Radio mini-haloes are poorly understood, moderately extended diffuse radio sources that trace the presence of magnetic fields and relativistic electrons on scales of hundreds of kiloparsecs, predominantly in relaxed clusters. With relatively few confirmed detections to-date, many questions remain unanswered. This paper presents new radio observations of the galaxy cluster MS 1455.0+2232 performed with MeerKAT (covering the frequency range 872−1712 MHz) and LOFAR (covering 120−168 MHz), the first results from a homogeneously selected mini-halo census. We find that this mini-halo extends for ∼590 kpc at 1283 MHz, significantly larger than previously believed, and has a flatter spectral index (α = −0.97 ± 0.05) than typically expected. Our X-ray analysis clearly reveals a large-scale (254 kpc) sloshing spiral in the intracluster medium. We perform a point-to-point analysis, finding a tight single correlation between radio and X-ray surface brightness with a super-linear slope of $b_{\rm 1283\, MHz} = 1.16^{+0.06}_{-0.07}$ and $b_{\rm 145\, MHz} = 1.15^{+0.09}_{-0.08}$; this indicates a strong link between the thermal and non-thermal components of the intracluster medium. Conversely, in the spectral index/X-ray surface brightness plane, we find that regions inside and outside the sloshing spiral follow different correlations. We find compelling evidence for multiple sub-components in this mini-halo for the first time. While both the turbulent (re-)acceleration and hadronic scenarios are able to explain some observed properties of the mini-halo in MS 1455.0+2232, neither scenario is able to account for all the evidence presented by our analysis.},
doi = {10.1093/mnras/stac672},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 512,
place = {United Kingdom},
year = {Fri Mar 11 00:00:00 EST 2022},
month = {Fri Mar 11 00:00:00 EST 2022}
}
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