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

J. K. Barrera-Ballesteros; B. García-Lorenzo; J. Falcón-Barroso; G. van de Ven; M. Lyubenova; V. Wild; J. Méndez-Abreu; S. F. Sánchez; I. Marquez; J. Masegosa; A. Monreal-Ibero; B. Ziegler; A. del Olmo; L. Verdes-Montenegro; R. García-Benito; B. Husemann; D. Mast; C. Kehrig; J. Iglesias-Paramo; R. A. Marino; J. A. L. Aguerri; C. J. Walcher; J. M. Vílchez; D. J. Bomans; C. Cortijo-Ferrero; R. M. González Delgado; J. Bland-Hawthorn; D. H. McIntosh; S. Bekeraitė

doi:10.1051/0004-6361/201424935

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

J. K. Barrera-Ballesteros, B. García-Lorenzo, J. Falcón-Barroso, G. van de Ven, M. Lyubenova, V. Wild, J. Méndez-Abreu, S. F. Sánchez, I. Marquez, J. Masegosa, A. Monreal-Ibero, B. Ziegler, A. del Olmo, L. Verdes-Montenegro, R. García-Benito, B. Husemann, D. Mast, C. Kehrig, J. Iglesias-Paramo, R. A. MarinoJ. A. L. Aguerri, C. J. Walcher, J. M. Vílchez, D. J. Bomans, C. Cortijo-Ferrero, R. M. González Delgado, J. Bland-Hawthorn, D. H. McIntosh, S. Bekeraitė

School of Physics and Astronomy

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Abstract

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 (δPA_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 δPA_kin are large for both samples. However, for a large fraction of interacting galaxies the ionized gas δPA_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°, 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.

Original language	English
Article number	A21
Number of pages	50
Journal	Astronomy & Astrophysics
Volume	582
Early online date	30 Sept 2015
DOIs	https://doi.org/10.1051/0004-6361/201424935
Publication status	Published - Oct 2015

Keywords

Galaxies: evolution
Galaxies: kinematics
Galaxies: interactions
Galaxies: statistics

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10.1051/0004-6361/201424935

Wild_2015_A&A_Tracing
© ESO, 2015. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1051/0004-6361/201424935
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Barrera-Ballesteros, J. K., García-Lorenzo, B., Falcón-Barroso, J., van de Ven, G., Lyubenova, M., Wild, V., Méndez-Abreu, J., Sánchez, S. F., Marquez, I., Masegosa, J., Monreal-Ibero, A., Ziegler, B., del Olmo, A., Verdes-Montenegro, L., García-Benito, R., Husemann, B., Mast, D., Kehrig, C., Iglesias-Paramo, J., ... Bekeraitė, S. (2015). Tracing kinematic (mis)alignments in CALIFA merging galaxies: Stellar and ionized gas kinematic orientations at every merger stage. Astronomy & Astrophysics, 582, Article A21. https://doi.org/10.1051/0004-6361/201424935

@article{48b0fb7df1e44140b241dfbfea0249d5,

title = "Tracing kinematic (mis)alignments in CALIFA merging galaxies: Stellar and ionized gas kinematic orientations at every merger stage",

abstract = "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 (PAkin, 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 (δPAkin). 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 δPAkin are large for both samples. However, for a large fraction of interacting galaxies the ionized gas δPAkin 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°, 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.",

keywords = "Galaxies: evolution, Galaxies: kinematics, Galaxies: interactions, Galaxies: statistics",

author = "Barrera-Ballesteros, {J. K.} and B. Garc{\'i}a-Lorenzo and J. Falc{\'o}n-Barroso and {van de Ven}, G. and M. Lyubenova and V. Wild and J. M{\'e}ndez-Abreu and S{\'a}nchez, {S. F.} and I. Marquez and J. Masegosa and A. Monreal-Ibero and B. Ziegler and {del Olmo}, A. and L. Verdes-Montenegro and R. Garc{\'i}a-Benito and B. Husemann and D. Mast and C. Kehrig and J. Iglesias-Paramo and Marino, {R. A.} and Aguerri, {J. A. L.} and Walcher, {C. J.} and V{\'i}lchez, {J. M.} and Bomans, {D. J.} and C. Cortijo-Ferrero and {Gonz{\'a}lez Delgado}, {R. M.} and J. Bland-Hawthorn and McIntosh, {D. H.} and S. Bekeraitė",

note = "J.M.A. and V.W. acknowledge support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild). ",

year = "2015",

month = oct,

doi = "10.1051/0004-6361/201424935",

language = "English",

volume = "582",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Barrera-Ballesteros, JK, García-Lorenzo, B, Falcón-Barroso, J, van de Ven, G, Lyubenova, M, Wild, V, Méndez-Abreu, J, Sánchez, SF, Marquez, I, Masegosa, J, Monreal-Ibero, A, Ziegler, B, del Olmo, A, Verdes-Montenegro, L, García-Benito, R, Husemann, B, Mast, D, Kehrig, C, Iglesias-Paramo, J, Marino, RA, Aguerri, JAL, Walcher, CJ, Vílchez, JM, Bomans, DJ, Cortijo-Ferrero, C, González Delgado, RM, Bland-Hawthorn, J, McIntosh, DH & Bekeraitė, S 2015, 'Tracing kinematic (mis)alignments in CALIFA merging galaxies: Stellar and ionized gas kinematic orientations at every merger stage', Astronomy & Astrophysics, vol. 582, A21. https://doi.org/10.1051/0004-6361/201424935

TY - JOUR

T1 - Tracing kinematic (mis)alignments in CALIFA merging galaxies

T2 - Stellar and ionized gas kinematic orientations at every merger stage

AU - Barrera-Ballesteros, J. K.

AU - García-Lorenzo, B.

AU - Falcón-Barroso, J.

AU - van de Ven, G.

AU - Lyubenova, M.

AU - Wild, V.

AU - Méndez-Abreu, J.

AU - Sánchez, S. F.

AU - Marquez, I.

AU - Masegosa, J.

AU - Monreal-Ibero, A.

AU - Ziegler, B.

AU - del Olmo, A.

AU - Verdes-Montenegro, L.

AU - García-Benito, R.

AU - Husemann, B.

AU - Mast, D.

AU - Kehrig, C.

AU - Iglesias-Paramo, J.

AU - Marino, R. A.

AU - Aguerri, J. A. L.

AU - Walcher, C. J.

AU - Vílchez, J. M.

AU - Bomans, D. J.

AU - Cortijo-Ferrero, C.

AU - González Delgado, R. M.

AU - Bland-Hawthorn, J.

AU - McIntosh, D. H.

AU - Bekeraitė, S.

N1 - J.M.A. and V.W. acknowledge support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild).

PY - 2015/10

Y1 - 2015/10

N2 - 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 (PAkin, 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 (δPAkin). 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 δPAkin are large for both samples. However, for a large fraction of interacting galaxies the ionized gas δPAkin 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°, 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.

AB - 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 (PAkin, 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 (δPAkin). 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 δPAkin are large for both samples. However, for a large fraction of interacting galaxies the ionized gas δPAkin 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°, 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.

KW - Galaxies: evolution

KW - Galaxies: kinematics

KW - Galaxies: interactions

KW - Galaxies: statistics

UR - http://adsabs.harvard.edu/abs/2015arXiv150603819B

U2 - 10.1051/0004-6361/201424935

DO - 10.1051/0004-6361/201424935

M3 - Article

SN - 0004-6361

VL - 582

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A21

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Starting Grant - SEDmorph: Starting Grant 2012 SEDMorph

VizieR Online Data Catalog: Merging galaxies (mis)alignments (Barrera-Ballesteros+, 2015)

Cite this

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Starting Grant - SEDmorph: Starting Grant 2012 SEDMorph

Datasets

VizieR Online Data Catalog: Merging galaxies (mis)alignments (Barrera-Ballesteros+, 2015)

Cite this