The Study of Nebular Emission on Nearby Spiral Galaxies in the IFU Era
Figure 2
(a) Spatial map of the fibres within the IFS mosaic of NGC 628 where nebular emission was detected. Blue fibres indicate regions above a S/N threshold for a proper abundance analysis, and grey fibres correspond to a diffuse emission. The size and position of the fibres (at real scale) are displayed in the standard NE-positive orientation. The crosshairs mark the central reference point of the IFS mosaic. The colour intensity of each fibre in the blue sample has been scaled to the flux intensity of H for that particular spectrum. (b) Oxygen abundance map of NGC 628 derived by applying the O3N2 calibrator [28] to the emission line maps of the galaxy. The figure shows a clear gradient in metallicity, with more abundant regions in the inner part or the galaxy. Figure adapted from Sánchez et al. [29] and Rosales-Ortega et al. [30].
