Issue |
A&A
Volume 585, January 2016
|
|
---|---|---|
Article Number | A92 | |
Number of page(s) | 6 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201525974 | |
Published online | 23 December 2015 |
Spiral-like star-forming patterns in CALIFA early-type galaxies⋆
1
Instituto de Astrofìsica e Ciências do Espaço, Universidade do
Porto, Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762
Porto,
Portugal
e-mail:
jean@astro.up.pt
2
Instituto de Astrofísica de Andalucía (CSIC),
Glorieta de la Astronomía s/n Aptdo.
3004, 18080
Granada,
Spain
3
Estación Experimental de Zonas Aridas (CSIC),
Ctra. de Sacramento s.n., La
Cañada, 04120
Almerìa,
Spain
4
Institut d’Astrophysique de Paris, UMR 7095, CNRS, Université
Pierre et Marie Curie, 98bis
boulevard Arago, 75014
Paris,
France
5
Instituto de Astronomía, Universidad Nacional Autonóma de
Mexico, A.P.
70-264, 04510
México, D.F., Mexico
6
University of Vienna, Türkenschanzstrasse 17, 1180
Vienna,
Austria
7
Sydney Institute for Astronomy, University of
Sydney, NSW 2006,
Australia
8 Millennium Institute of Astrophysics, Chile
9
Departamento de Astronomía, Universidad de Chile,
Casilla 36-D, 1058
Santiago,
Chile
10
Astronomical Institute of the Ruhr-University Bochum,
Universitätsstr. 150, 44580
Bochum,
Germany
11
RUB Research Department “Plasmas with Complex Interactions”,
Universitätsstr. 150, 44580
Bochum,
Germany
12
Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis E. Erro 1,
72840
Tonantzintla, Puebla, Mexico
13
Leibniz-Institut für Astrophysik Potsdam (AIP),
An der Sternwarte 16,
14482
Potsdam,
Germany
14
CIEMAT, Avda. Complutense 40, 28040
Madrid,
Spain
15
CEI Campus Moncloa, UCM-UPM, Departamento de Astrofísica y CC. de
la Atmósfera, Facultad de CC. Físicas, Universidad Complutense de
Madrid, Avda. Complutense
s/n, 28040
Madrid,
Spain
16
Department of Physics, Institute for Astronomy,
ETH Zürich, 8093
Zürich,
Switzerland
17
Departamento de Astrofísica y CC. de la Atmósfera, Universidad
Complutense de Madrid, 28040
Madrid,
Spain
18
Australian Astronomical Observatory, PO Box 915, North Ryde, NSW
1670,
Australia
19 Department of Physics and Astronomy, Macquarie University,
NSW 2109, Australia
Received: 26 February 2015
Accepted: 25 September 2015
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.
Key words: galaxies: elliptical and lenticular, cD / galaxies: nuclei / galaxies: ISM / galaxies: kinematics and dynamics / galaxies: star formation
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.