Low-frequency observations of the giant radio galaxy NGC 6251:
- Cantwell, T M
- Bray, J D
- Croston, J H
- Scaife, A M M
- Mulcahy, D D
- Best, P N
- Brüggen, M
- Brunetti, G
- Callingham, J R
- Clarke, A O
- Hardcastle, M J
- Harwood, J J
- Heald, G
- Heesen, V
- Iacobelli, M
- Jamrozy, M
- Morganti, R
- Orru, E
- O’Sullivan, S P
- Riseley, C J
- Röttgering, H J A
- Shulevski, A
- Sridhar, S S
- Tasse, C
- Van Eck, C L
DOIAbstract
We present LOFAR observations at 150 MHz of the borderline FRI/FRII giant radio galaxy NGC 6251. This paper presents the most sensitive and highest resolution images of NGC 6251 at these frequencies to date, revealing for the first time a low-surface-brightness extension to the northern lobe, and a possible backflow associated with the southern lobe. The integrated spectra of components of NGC 6251 are consistent with previous measurements at higher frequencies, similar to results from other LOFAR studies of nearby radio galaxies
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