Detection of Deuterated Hydrocarbon Nanoparticles in the Whirlpool Galaxy, M51

Draine, B. T.; Sandstrom, Karin; Dale, Daniel A.; Smith, J.-D. T.; Chown, Ryan; Donnelly, Grant P.; Duval, Sara E.; Whitcomb, Cory M.; Adamo, Angela; Armus, L.; Berg, Danielle A.; B{\"oker}, Torsten; Bolatto, Alberto D.; Boyer, Martha L.; Calzetti, Daniela; Elmegreen, B. G.; Gaches, Brandt A.~L.; Gordon, Karl D.; Hunt, L. K.; Kennicutt, R. C.; Klessen, Ralf S.; Lai, Thomas S.-Y.; Leroy, Adam K.; Linden, Sean T.; Pedrini, Alex; Rogers, Noah S.~J.; Roman-Duval, Julia C.; Schinnerer, Eva; Skillman, Evan B.; Walter, Fabian; Weinbeck, Tony D.; Williams, Benjamin F.

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