Imaging FTS: A Different Approach to Integral Field Spectroscopy
Figure 6
(a) Metallicity gradient of NGC628 derived using the N2 indicator from PP04 and the HII regions defined with HIIphot. The black diamonds (and their corresponding linear fit given by the black dash curve) is obtained using all the HII regions identified. The red diamonds (and corresponding dash red linear fit) are for the 134 regions that can also be characterized with the O3N2 indicator. (b) Metallicity gradient derived using the O3N2 indicator from PP04 and 134 HII regions defined with HII phot. Typical error bars are shown on the plot.
