Free Access

Fig. 7.

image

Download original image

Spectral index maps of NGC 507 between 144 MHz and 400 MHz at a resolution of 7 arcsec (left) and 20 arcsec (right). Only pixels with surface brightness above 3σ in both images were used. Contours show the LOFAR emission at 144 MHz and are drawn at [−3, 3, 5, 10, 20, 40, 60, 90] × σ. Typical errors in the brightest pixels are equal to ∼0.1 and in the faintest pixels to 0.15–0.2.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.