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We use measurements of nitrogen abundances in red giants to search formultiple stellar populations in the four most metal-poor globular clusters(GCs) in the Fornax dwarf spheroidal galaxy (Fornax 1, 2, 3, and 5). Newimaging in the F343N filter, obtained with the Wide Field Camera 3 on theHubble Space Telescope, is combined with archival F555W and F814W observationsto determine the strength of the NH band near 3370 AA. After accounting forobservational errors, the spread in the F343N-F555W colors of red giants in theFornax GCs is similar to that in M15 and corresponds to an abundance range ofDelta([N/Fe])=2 dex, as observed also in several Galactic GCs. The spread inF555W-F814W is, instead, fully accounted for by observational errors. The starswith the reddest F343N-F555W colors (indicative of N-enhanced composition) havemore centrally concentrated radial distributions in all four clusters, althoughthe difference is not highly statistically significant within any individualcluster. From double-Gaussian fits to the color distributions we find roughlyequal numbers of "N-normal" and "N-enhanced" stars (formally about 40% N-normalstars in Fornax 1, 3, and 5 and 60% in Fornax 2). We conclude that GCformation, in particular regarding the processes responsible for the origin ofmultiple stellar populations, appears to have operated similarly in the MilkyWay and in the Fornax dSph. Combined with the high ratio of metal-poor GCs tofield stars in the Fornax dSph, this places an important constraint onscenarios for the origin of multiple stellar populations in GCs.

Nitrogen abundances and multiple stellar populations in the globular clusters of the Fornax dSph