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

被引：42

作者：

Gomes, J. M. ^{[1
]}

Papaderos, P. ^{[1
]}

Vilchez, J. M. ^{[2
]}

Kehrig, C. ^{[2
]}

Iglesias-Paramo, J. ^{[2
,3
]}

Breda, I. ^{[1
]}

Lehnert, M. D. ^{[4
]}

Sanchez, S. F. ^{[5
]}

Ziegler, B. ^{[6
]}

dos Reis, S. N. ^{[1
]}

Bland-Hawthorn, J. ^{[7
]}

Galbany, L. ^{[8
,9
]}

Bomans, D. J. ^{[10
,11
]}

Rosales-Ortega, F. F. ^{[12
]}

Walcher, C. J. ^{[13
]}

Garcia-Benito, R. ^{[2
]}

Marquez, I. ^{[2
]}

del Olmo, A. ^{[2
]}

Molla, M. ^{[14
]}

Marino, R. A. ^{[15
,16
]}

Catalan-Torrecilla, C. ^{[17
]}

Gonzalez Delgado, R. M. ^{[2
]}

Lopez-Sanchez, A. R. ^{[18
,19
]}

机构：

[1] Univ Porto, Ctr Astrofis, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal

[2] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N Aptdo 3004, E-18080 Granada, Spain

[3] CSIC, Estn Expt Zonas Aridas, Ctra Sacramento Sn, La Canada De San Urbano 04120, Spain

[4] Univ Paris 06, CNRS, UMR 7095, Inst Astrophys Paris, 98bis Blvd Arago, F-75014 Paris, France

[5] Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico

[6] Univ Vienna, Turkenschanzstr 17, A-1180 Vienna, Austria

[7] Univ Sydney, Sydney Inst Astron, Sydney, NSW 2006, Australia

[8] Millennium Inst Astrophys, Santiago, Chile

[9] Univ Chile, Dept Astron, Casilla 36-D, Santiago 1058, Chile

[10] Ruhr Univ Bochum, Astron Inst, Univ Str 150, D-44580 Bochum, Germany

[11] RUB Res Dept Plasmas Complex Interact, Univ Str 150, D-44580 Bochum, Germany

[12] Inst Nacl Astrofis Opt & Electr, Luis E Erro 1, Puebla 72840, Mexico

[13] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[14] CIEMAT, Avda Complutense 40, E-28040 Madrid, Spain

[15] Univ Complutense Madrid, Fac CC Fis, Dept Astrofis & CC Atmosfera, UPM, CEI Campus Moncloa,Avda Complutense S-N, E-28040 Madrid, Spain

[16] ETH, Inst Astron, Dept Phys, CH-8093 Zurich, Switzerland

[17] Univ Complutense Madrid, Dept Astrofis & CC Atmosfera, E-28040 Madrid, Spain

[18] Australian Astron Observ, POB 915, N Ryde, NSW 1670, Australia

[19] Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 585卷

关键词：

galaxies: elliptical and lenticular; cD; galaxies: nuclei; galaxies: ISM; galaxies: kinematics and dynamics; galaxies: star formation; POTSDAM MULTIAPERTURE SPECTROPHOTOMETER; COMPACT DWARF GALAXIES; DIGITAL SKY SURVEY; IONIZED-GAS; SAURON PROJECT; H-ALPHA; EMISSION; EVOLUTION; MASS; CLASSIFICATION;

D O I：

10.1051/0004-6361/201525974

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：6

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