Tracing kinematic (mis)alignments in CALIFA merging galaxies Stellar and ionized gas kinematic orientations at every merger stage

被引：95

作者：

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

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

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

van de Ven, G. ^{[3
]}

Lyubenova, M. ^{[3
,4
]}

Wild, V. ^{[5
]}

Mendez-Abreu, J. ^{[5
]}

Sanchez, S. F. ^{[6
]}

Marquez, I. ^{[7
]}

Masegosa, J. ^{[7
]}

Monreal-Ibero, A. ^{[8
,9
]}

Ziegler, B. ^{[10
]}

del Olmo, A. ^{[7
]}

Verdes-Montenegro, L. ^{[7
]}

Garcia-Benito, R. ^{[7
]}

Husemann, B. ^{[8
,11
]}

Mast, D. ^{[12
]}

Kehrig, C. ^{[7
]}

Iglesias-Paramo, J. ^{[7
,13
]}

Marino, R. A. ^{[14
]}

Aguerri, J. A. L. ^{[1
,2
]}

Walcher, C. J. ^{[8
]}

Vilchez, J. M. ^{[7
]}

Bomans, D. J. ^{[15
,16
]}

Cortijo-Ferrero, C. ^{[7
]}

Gonzalez Delgado, R. M. ^{[7
]}

Bland-Hawthorn, J. ^{[17
]}

McIntosh, D. H. ^{[18
]}

Bekeraite, S. ^{[8
]}

机构：

[1] Inst Astrofis Canarias, Tenerife 38205, Spain

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

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

[4] Univ Groningen, Kapteyn Astron Inst, NL-9747 AD Groningen, Netherlands

[5] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

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

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

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

[9] Univ Paris Diderot, GEPI Observ Paris, CNRS, F-92190 Meudon, France

[10] Univ Vienna, A-1180 Vienna, Austria

[11] European So Observ, D-85748 Garching, Germany

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

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

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

[15] Ruhr Univ Bochum, Astron Inst, D-44580 Bochum, Germany

[16] RUB Res Dept Plasmas Complex Interact, D-44580 Bochum, Germany

[17] Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia

[18] Univ Missouri, Dept Phys & Astron, Kansas City, MO 64110 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 582卷

基金：

欧洲研究理事会;

关键词：

galaxies: evolution; galaxies: interactions; galaxies: kinematics and dynamics; galaxies: statistics; ULTRALUMINOUS INFRARED GALAXIES; DIGITAL SKY SURVEY; INTEGRAL FIELD SPECTROSCOPY; SUPERMASSIVE BLACK-HOLES; FORMING GALAXIES; DISK GALAXIES; AREA SURVEY; EQUAL-MASS; INTERACTING GALAXIES; VELOCITY-FIELDS;

D O I：

10.1051/0004-6361/201424935

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present spatially resolved stellar and/or ionized gas kinematic properties for a sample of 103 interacting galaxies, tracing all merger stages: close companions, pairs with morphological signatures of interaction, and coalesced merger remnants. In order to distinguish kinematic properties caused by a merger event from those driven by internal processes, we compare our galaxies with a control sample of 80 non-interacting galaxies. We measure for both the stellar and the ionized gas components the major (projected) kinematic position angles (PA(kin), approaching and receding) directly from the velocity distributions with no assumptions on the internal motions. This method also allow us to derive the deviations of the kinematic PAs from a straight line (delta PA(kin)). We find that around half of the interacting objects show morpho-kinematic PA misalignments that cannot be found in the control sample. In particular, we observe those misalignments in galaxies with morphological signatures of interaction. On the other hand, the level of alignment between the approaching and receding sides for both samples is similar, with most of the galaxies displaying small misalignments. Radial deviations of the kinematic PA orientation from a straight line in the stellar component measured by delta PA(kin) are large for both samples. However, for a large fraction of interacting galaxies the ionized gas delta PA(kin) is larger than the typical values derived from isolated galaxies (48%), indicating that this parameter is a good indicator to trace the impact of interaction and mergers in the internal motions of galaxies. By comparing the stellar and ionized gas kinematic PA, we find that 42% (28/66) of the interacting galaxies have misalignments larger than 16 degrees, compared to 10% from the control sample. Our results show the impact of interactions in the motion of stellar and ionized gas as well as the wide the variety of their spatially resolved kinematic distributions. This study also provides a local Universe benchmark for kinematic studies in merging galaxies at high redshift.

引用

页数：50

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