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We present deep R and narrow-band Halpha images of Arp 78 obtained with theWIYN 3.5-m telescope on Kitt Peak. GALEX observations had shown a very extendedUV structure for this system, reaching beyond the optical radius of Arp 78 andalso beyond its previously known Halpha-radius. Our new Halpha data now showagreement not only with the spatial extent of the near- and far-UV maps, butalso in terms of structural details. Star formation rates derived fromL(Halpha) and L(FUV) are in reasonable agreement, indicating that in this casethe upper stellar IMF in the UV-bright outer arm is relatively normal. The starforming sites in the outer arms are younger than ~15 Myr and massive enough toproperly sample the IMF up to high masses; their low optical visibilityevidently is a property of their youth.

Rescuing the Initial Mass Function for Arp 78