Spiral-like star-forming patterns in CALIFA early-type galaxies
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2016Metadata
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Gomes, J.
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Spiral-like star-forming patterns in CALIFA early-type galaxies
Author
- Gomes, J.;
- Papaderos, P.;
- Vilchez, J.;
- Kehrig, C.;
- Iglesias Paramo, J.;
- Breda, I.;
- Lehnert, M.;
- Sánchez, S.;
- Ziegler, B.;
- dos Reis, S.;
- Bland Hawthorn, J.;
- Galbany, Lluis;
- Bomans, D.;
- Rosales Ortega, F.;
- Walcher, C.;
- García Benito, R.;
- Marquez, I.;
- del Olmo, A.;
- Molla, M.;
- Marino, R.;
- Catalan Torrecilla, C.;
- González Delgado, R. M.;
- López Sánchez, Ángel R.;
Abstract
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/square" < 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) similar or equal to 1 angstrom) low-ionization nuclear emission-line region (LINER) properties, and the outer one (3 angstrom < EW(H alpha)less than or similar to 20 angstrom) 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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Artículo de publicación ISI
Patrocinador
CONICYT through FONDECYT
3140566
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URI: https://repositorio.uchile.cl/handle/2250/139020
DOI: DOI: 10.1051/0004-6361/201525974
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Astronomy & Astrophysics Volumen: 585 Número de artículo: A92 (2016)
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Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 Chile
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