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

Based 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 becaus...

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Detalles Bibliográficos
Autores: Gomes, J. M., Papaderos, P., Vílchez Medina, José Manuel, Kehrig, C., Iglesias-Páramo, J., Breda, I., Lehnert, M.D., Sánchez, Sebastián F., Ziegler, B., Dos Reis, S. N., Bland-Hawthorn, J., Galbany, Lluís, 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.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/133772
Acceso en línea:http://hdl.handle.net/10261/133772
Access Level:acceso abierto
Palabra clave:Galaxies: star formation
Galaxies: elliptical and lenticular, cD
Galaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: ISM
Descripción
Sumario:Based 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.

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