AGN taxonomy: Radio galaxies
{"Image DocumentName": "AGN taxonomy: Radio galaxies", "Image ImageDescription": "Strong radio sources associated with giant elliptical galaxies, with optical spectra similar to Seyfert galaxies. Sub-classification according to. optical spectra: NLRG = narrow-line radio galaxy, and BLRG = broad-line radio galaxy, with optical spectra similar to Sy 2 and Sy 1, respectively. spectral index (\u03b1, such that F\u03bd=\u03bd\u03b1 ) at 1GHz: steep or flat separated by \u03b1=\u22120.4. radio morphology (Fanaroff & Riley 1974): measured by the ratio of the distance between the two brightest spots and the overall size of the radio image. FR I with R<0.5 and FR II with R>0.5. Hydra A. 2.7=188 kpc. (Aretxaga et al. 2001) \u00a9Chandra. Point out the low excitation of the lines. FR IIs the most powerful RGs. Hydra A an FR I.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}