Spiral-like star-forming patterns in CALIFA early-type galaxies

J. M. Gomes , P. Papaderos , J. M. V\'ilchez , C. Kehrig , J. Iglesias-P\'aramo , I. Breda , M. D. Lehnert , S. F. S\'anchez

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B. Ziegler S. N. dos Reis J. Bland-Hawthorn L. Galbany D. J. Bomans F. F. Rosales-Ortega C. J. Walcher R. Garc\'ia-Benito I. M\'arquez A. Del Olmo M. Moll\'a R. A. Marino C. Catal\'an-Torrecilla R. M. Gonz\'alez Delgado \'A. R. L\'opez-S\'anchez the CALIFA collaboration

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classification 🌌 astro-ph.GA

keywords etgsalphacalifadataearly-typefaintfeaturesgalaxies

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Based on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 < {\mu}$_r$ mag/arcsec$^2$ < 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(H\alpha)$\simeq$1{\AA}) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3{\AA}<EW(H\alpha)<~20{\AA}) 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.

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