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Radio haloes in nearby galaxies modelled with 1d cosmic ray transport using SPINNAKER

Radio haloes in nearby galaxies modelled with 1d cosmic ray transport using SPINNAKER
Radio haloes in nearby galaxies modelled with 1d cosmic ray transport using SPINNAKER

We present radio continuum maps of 12 nearby (D ≤ 27 Mpc), edge-on (i ≥ 76?), latetypespiral galaxies mostly at 1.4 and 5 GHz, observed with the Australia Telescope CompactArray, Very LargeArray, Westerbork Synthesis Radio Telescope, Effelsberg 100-m, and Parkes64-m telescopes. All galaxies show clear evidence of radio haloes, including the first detectionin the Magellanic-type galaxy NGC 55. In 11 galaxies, we find a thin and a thick discthat can be better fitted by exponential rather than Gaussian functions. We fit our SPINNAKER(SPectral INdex Numerical Analysis of K(c)osmic-ray Electron Radio-emission) 1D cosmicray transport models to the vertical model profiles of the non-thermal intensity and to thenon-thermal radio spectral index in the halo. We simultaneously fit for the advection speed (ordiffusion coefficient) and magnetic field scale height. In the thick disc, the magnetic field scaleheights range from 2 to 8 kpc with an average across the sample of 3.0 ± 1.7 kpc; they showno correlation with either star formation rate (SFR), SFR surface density (Σ SFR), or rotationspeed (Vrot). The advection speeds range from 100 to 700 km s-1 and display correlations ofV α SFR0.36±0.06 and V α Σ0.39±0.09 SFR; they agree remarkably well with the escape velocities(0.5 ≤ V/Vesc ≤ 2), which can be explained by cosmic ray-driven winds. Radio haloes showthe presence of disc winds in galaxies with ΣSFR > 10-3Mo˙yr-1 kpc-2 that extend overseveral kpc and are driven by processes related to the distributed star formation in the disc.

Cosmic rays, Galaxies: haloes, Galaxies: magnetic fields, Methods: numerical, Radiation mechanisms: non-thermal, Radio continuum: galaxies
0035-8711
158-183
Heesen, V.
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Krause, M.
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Beck, R.
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Adebahr, B.
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Bomans, D.J.
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Carretti, E.
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Dumke, M.
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Heald, G.
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Irwin, J.
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Koribalski, B.S.
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Mulcahy, D.D.
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Westmeier, T.
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Dettmar, R.J.
e741acc9-f47c-4fbc-825b-8fbc9590dd50
Heesen, V.
b8b21826-1b25-493c-9f2a-9b0428dd1713
Krause, M.
fba8e07a-e84b-4d41-8967-c62fefb7994b
Beck, R.
c61b7f92-c927-4f1f-9bab-a6b48fbd93a4
Adebahr, B.
511a5269-2c75-4df9-b75b-cc0264db6434
Bomans, D.J.
28246a32-2bb1-46b1-bc4d-94eb1ad213f3
Carretti, E.
d0771d21-a0fa-4e1b-9b7c-50d8ec422b22
Dumke, M.
901fbec0-25d0-4ca5-a4f1-cacd252d3649
Heald, G.
12b841c9-c9d3-4bd7-9a69-dbf4c08294ad
Irwin, J.
f35ef903-ee04-469f-a361-e43cc1ca9b83
Koribalski, B.S.
ccc8d167-eef8-4e68-8cba-6dcc5e0f3c15
Mulcahy, D.D.
07ba7af8-66a2-470c-93d9-a4238a2ace00
Westmeier, T.
97b16f18-d65b-4119-83d2-8382c081f624
Dettmar, R.J.
e741acc9-f47c-4fbc-825b-8fbc9590dd50

Heesen, V., Krause, M., Beck, R., Adebahr, B., Bomans, D.J., Carretti, E., Dumke, M., Heald, G., Irwin, J., Koribalski, B.S., Mulcahy, D.D., Westmeier, T. and Dettmar, R.J. (2018) Radio haloes in nearby galaxies modelled with 1d cosmic ray transport using SPINNAKER. Monthly Notices of the Royal Astronomical Society, 476 (1), 158-183. (doi:10.1093/mnras/sty105).

Record type: Article

Abstract

We present radio continuum maps of 12 nearby (D ≤ 27 Mpc), edge-on (i ≥ 76?), latetypespiral galaxies mostly at 1.4 and 5 GHz, observed with the Australia Telescope CompactArray, Very LargeArray, Westerbork Synthesis Radio Telescope, Effelsberg 100-m, and Parkes64-m telescopes. All galaxies show clear evidence of radio haloes, including the first detectionin the Magellanic-type galaxy NGC 55. In 11 galaxies, we find a thin and a thick discthat can be better fitted by exponential rather than Gaussian functions. We fit our SPINNAKER(SPectral INdex Numerical Analysis of K(c)osmic-ray Electron Radio-emission) 1D cosmicray transport models to the vertical model profiles of the non-thermal intensity and to thenon-thermal radio spectral index in the halo. We simultaneously fit for the advection speed (ordiffusion coefficient) and magnetic field scale height. In the thick disc, the magnetic field scaleheights range from 2 to 8 kpc with an average across the sample of 3.0 ± 1.7 kpc; they showno correlation with either star formation rate (SFR), SFR surface density (Σ SFR), or rotationspeed (Vrot). The advection speeds range from 100 to 700 km s-1 and display correlations ofV α SFR0.36±0.06 and V α Σ0.39±0.09 SFR; they agree remarkably well with the escape velocities(0.5 ≤ V/Vesc ≤ 2), which can be explained by cosmic ray-driven winds. Radio haloes showthe presence of disc winds in galaxies with ΣSFR > 10-3Mo˙yr-1 kpc-2 that extend overseveral kpc and are driven by processes related to the distributed star formation in the disc.

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More information

Accepted/In Press date: 4 January 2018
e-pub ahead of print date: 15 January 2018
Published date: 1 May 2018
Keywords: Cosmic rays, Galaxies: haloes, Galaxies: magnetic fields, Methods: numerical, Radiation mechanisms: non-thermal, Radio continuum: galaxies

Identifiers

Local EPrints ID: 419808
URI: http://eprints.soton.ac.uk/id/eprint/419808
ISSN: 0035-8711
PURE UUID: a72e58a9-86e3-4f73-bfa6-702e2e79a10c

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Date deposited: 20 Apr 2018 16:30
Last modified: 13 Mar 2019 18:43

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Contributors

Author: V. Heesen
Author: M. Krause
Author: R. Beck
Author: B. Adebahr
Author: D.J. Bomans
Author: E. Carretti
Author: M. Dumke
Author: G. Heald
Author: J. Irwin
Author: B.S. Koribalski
Author: D.D. Mulcahy
Author: T. Westmeier
Author: R.J. Dettmar

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