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

AuthorsGomes, J. M.; Papaderos, P.; Vílchez Medina, José Manuel ; 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, Fabián ; Walcher, C. J.; García-Benito, Rubén ; Márquez, Isabel ; Olmo, Ascensión del ; Mollá, M.; Marino, R. A.; Catalán-Torrecilla, C.; González Delgado, Rosa M. ; López-Sánchez, A. R.
KeywordsGalaxies: star formation
Galaxies: elliptical and lenticular, cD
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: ISM
Issue Date2016
PublisherEDP Sciences
CitationAstronomy and Astrophysics 585 (2016)
AbstractBased on a combined analysis of SDSS imaging and CALIFA integral field spectroscopy data, we report on the detection of faint (24 <μ 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.
Identifiersdoi: 10.1051/0004-6361/201525974
issn: 1432-0746
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