Gomes, J. M.Papaderos, P.Vílchez, J. M.Kehrig, C.Iglesias Páramo, J.Breda, I.Lehnert, M. D.Sánchez, S. F.Ziegler, B.dos Reis, S. N.Bland Hawthorn, J.Galbany, L.Bomans, D. J.Rosales Ortega, F. F.Walcher, C. J.García Benito, R.Márquez, I.del Olmo, A.Mollá, M.Marino, Raffaella AnnaCatalán Torrecilla, CristinaGonzález Delgado, R. M.López Sánchez, Á. R.CALIFA Team2023-06-182023-06-18© ESO, 2012016-011432-074610.1051/0004-6361/201525974https://hdl.handle.net/20.500.14352/24443Based on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 <μr mag/□″< 26) star-forming spiral-arm-like features in the periphery of three nearby early-type galaxies (ETGs). These features are of considerable interest because they document the still ongoing inside-out growth of some local ETGs and may add valuable observational insight into the origin and evolution of spiral structure in triaxial stellar systems. A characteristic property of the nebular component in the studied ETGs, classified i+, is a two-radial-zone structure, with the inner zone that displays faint (EW(Hα) ≃ 1 Å) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3 Å <EW(Hα)≲ 20 Å) Hii-region characteristics. This spatial segregation of nebular emission in two physically distinct concentric zones calls for an examination of aperture effects in studies of type i+ ETGs with single-fiber spectroscopic data.engjournal articlehttp://dx.doi.org/10.1051/0004-6361/201525974http://arxiv.org/abs/1511.00744http://www.aanda.org/open access52Potsdam multiaperture spectrophotometerCompact dwarf galaxiesDigital sky surveyNearby galaxiesSauron projectIonized-gasLenticular galaxiesElliptic galaxiesH-alphaEmissionAstrofísicaAstronomía (Física)