Central star formation and metallicity in CALIFA interacting galaxies

被引：66

作者：

Barrera-Ballesteros, J. K. ^{[1
,2
]}

Sanchez, S. F. ^{[3
]}

Garcia-Lorenzo, B. ^{[1
,2
]}

Falcon-Barroso, J. ^{[1
,2
]}

Mast, D. ^{[4
]}

Garcia-Benito, R. ^{[5
]}

Husemann, B. ^{[6
]}

van de Ven, G. ^{[7
]}

Iglesias-Paramo, J. ^{[5
,8
]}

Rosales-Ortega, F. F. ^{[9
]}

Perez-Torres, M. A. ^{[5
,10
]}

Marquez, I. ^{[5
]}

Kehrig, C. ^{[5
]}

Marino, R. A. ^{[11
]}

Vilchez, J. M. ^{[5
]}

Galbany, L. ^{[12
,13
]}

Lopez-Sanchez, A. R. ^{[14
,15
]}

Walcher, C. J. ^{[16
]}

机构：

[1] IAC, Tenerife 38205, Spain

[2] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[3] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico

[4] Ctr Brasileiro Pesquisas Fis, ICRA, BR-22290180 Rio De Janeiro, RJ, Brazil

[5] Inst Astrofis Andalucia CSIC, Granada 18080, Spain

[6] ESO, D-85748 Garching, Germany

[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[8] Estn Expt Zonas Aridas CSIC, La Canada De San Urbano, Almeria, Spain

[9] Inst Nacl Astrofis Opt & Electr, Puebla 72840, Mexico

[10] Ctr Estudios Fis Cosmos Aragon, Teruel 44001, Spain

[11] Univ Complutense Madrid, UCM UPM, Dept Astrofis & CC Atmosfera, Fac CC Fis, E-28040 Madrid, Spain

[12] Univ Chile, Millennium Inst Astrophys, Santiago 1058, Chile

[13] Univ Chile, Dept Astron, Santiago, Chile

[14] Australian Astron Observ, N Ryde, NSW 1670, Australia

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

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

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 579卷

关键词：

galaxies: evolution; galaxies: interactions; galaxies: star formation; galaxies: abundances; DIGITAL SKY SURVEY; INTEGRAL FIELD SPECTROSCOPY; PAIRS; MERGER; STELLAR; MASS; SIMULATIONS; GASDYNAMICS; FEEDBACK; SPECTRA;

D O I：

10.1051/0004-6361/201425397

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use optical integral-field spectroscopic (IFS) data from 103 nearby galaxies at different stages of the merging event, from close pairs to merger remnants provided by the CALIFA survey, to study the impact of the interaction in the specific star formation and oxygen abundance on different galactic scales. To disentangle the effect of the interaction and merger from internal processes, we compared our results with a control sample of 80 non-interacting galaxies. We confirm the moderate enhancement (x2-3 times) of specific star formation for interacting galaxies in central regions as reported by previous studies; however, the specific star formation is comparable when observed in extended regions. We find that control and interacting star-forming galaxies have similar oxygen abundances in their central regions, when normalized to their stellar masses. Oxygen abundances of these interacting galaxies seem to decrease compared to the control objects at the large aperture sizes measured in effective radius. Although the enhancement in central star formation and lower metallicities for interacting galaxies have been attributed to tidally induced inflows, our results suggest that other processes such as stellar feedback can contribute to the metal enrichment in interacting galaxies.

引用

页数：9

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