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I present two-band HST STIS imaging, and WIYN spectral mapping, of ongoingmass transfer in the interacting galaxy pair NGC 1409/10 (where NGC 1410 is theSeyfert galaxy also catalogued as III Zw 55). Archival snapshot WFPC2 imagingfrom the survey by Malkan et al. showed a dust feature stretching between thegalaxies, apparently being captured by NGC 1409. The new images allow estimatesof the mass being transferred and rate of transfer. An absorption lanetypically 0.25" (100 pc) wide with a representative optical depth tau_B = 0.2cuts across the spiral structure of NGC 1410, crosses the 7-kpc projected spacebetween the nuclei, wraps in front of and, at the limits of detection, behindNGC 1409, and becomes a denser (tau_B = 0.4) polar feature around the core ofNGC 1409. Combination of extinction data in two passbands allows a crudethree-dimensional recovery of the dust structure, supporting the front/backgeometry derived from colors and extinction estimates. The whole featurecontains of order $10^6$ solar masses in dust, implying about 2x10^7 solarmasses of gas, requiring a mass transfer rate averaging ~1 solar mass per yearunless we are particularly unlucky in viewing angle. Curiously, thisdemonstrable case of mass transfer seems to be independent of the occurrence ofa Seyfert nucleus, since the Seyfert galaxy in this pair is the donor of thematerial. Likewise, the recipient shows no signs of recent star formation fromincoming gas, although NGC 1410 has numerous luminous young star clusters andwidespread H-alpha emission.Comment: 27 pages, 9 figures. Accepted for the Astronomical Journal, March  200

Ongoing Mass Transfer in the Interacting Galaxy Pair NGC 1409/1410