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 <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 becau...

Descripción completa

Detalles Bibliográficos
Autores: 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 Anna, Catalán Torrecilla, Cristina, González Delgado, R. M., López Sánchez, Á. R., CALIFA Team
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/24443
Acceso en línea:https://hdl.handle.net/20.500.14352/24443
Access Level:acceso abierto
Palabra clave:52
Potsdam multiaperture spectrophotometer
Compact dwarf galaxies
Digital sky survey
Nearby galaxies
Sauron project
Ionized-gas
Lenticular galaxies
Elliptic galaxies
H-alpha
Emission
Astrofísica
Astronomía (Física)
Descripción
Sumario:Based 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.

Similares en LA Referencia