The nature of the low-frequency emission of M 51: First observations of a nearby galaxy with LOFAR
- Mulcahy, D. D.
- Horneffer, A.
- Beck, R.
- Heald, G.
- Fletcher, A.
- Scaife, A.
- Adebahr, B.
- Anderson, J. M.
- Bonafede, A.
- Brüggen, M.
- Brunetti, G.
- Chyz Y, K. T.
- Conway, J.
- Dettmar, R. -J.
- Enßlin, T.
- Haverkorn, M.
- Horellou, C.
- Iacobelli, M.
- Israel, F. P.
- Junklewitz, H.
- Jurusik, W.
- Köhler, J.
- Kuniyoshi, M.
- Orrú, E.
- Paladino, R.
- Pizzo, R.
- Reich, W.
- Röttgering, H. J. A.
DOIAbstract
Context. Low-frequency radio continuum observations (<300 MHz) can provide valuable information on the propagation of low-energy cosmic ray electrons (CRE). Nearby spiral galaxies have hardly been studied in this frequency range because of the technical challenges of low-frequency radio interferometry. This is now changing with the start of operations of LOFAR. Aims. We aim to study the propagation of low-energy CRE in the interarm regions and the extended disk of the nearly face-on spiral galaxy Messier 51. We also search for polarisation in M 51 and other extragalactic sources in the field. Methods. The grand-design spiral galaxy M 51 was observed with the LOFAR High Frequency Antennas (HBA) and imaged in total intensity and polarisation....
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