2016A&A...591A..85B


Query : 2016A&A...591A..85B

2016A&A...591A..85B - Astronomy and Astrophysics, volume 591A, 85-85 (2016/7-1)

Distinguishing disks from mergers: Tracing the kinematic asymmetries in local (U)LIRGs using kinemetry-based criteria.

BELLOCCHI E., ARRIBAS S. and COLINA L.

Abstract (from CDS):

Context. The kinematic characterization of different galaxy populations is a key observational input for distinguishing between different galaxy evolutionary scenarios because it helps to determine the number ratio of rotating disks to mergers at different cosmic epochs. Local (ultra) luminous infrared galaxies ((U)LIRGs) cover similar range of star formation rates (SFR) as normal high redshift (high-z), star-forming galaxies (SFGs). Therefore, their study offer a unique opportunity to study at high linear resolution and signal-to-noise (S/N) extreme star forming events and compare these events with those observed at high-z.
Aims. Our goal is to analyze in detail the kinematics of the ionized gas as traced by the Hα emission of a large sample of 38 local (z<0.1) (U)LIRG systems (50 individual galaxies). In this study, we apply kinematic criteria, which are able to characterize the evolutionary status of these systems, allowing us to derive the disk and merger ratio in such local systems.
Methods. We obtained Very Large Telescope (VLT) VIMOS optical integral field spectroscopy (IFS) data of a sample of 38 (U)LIRGs. These systems are morphologically classified in four groups according to their dynamical phases: isolated disk, paired disk, ongoing merger, and post-coalescence merger. The first two are referred as "disk", while the second two are referred to as "merger". The "unweighted" and "weighted" kinemetry-based methods are used to kinematically classify our galaxies in disk and merger. The total kinematic asymmetry value Ktot has been used to quantify the global kinematic asymmetry degree of the observed and simulated systems.
Results. From the kinemetry-based analysis we are able classify our local (U)LIRGs in three distinct kinematic groups according to their total kinematic asymmetry values (Ktot) as derived when using the weighted (unweighted) method: (1) 25 out of 50 galaxies are kinematically classified as disk with a Ktot<=0.16(0.14); (2) 9 out of 50 galaxies are kinematically classified as merger with a Ktot>=0.94(0.66); (3) 16 out of 50 galaxies lie in the "transition region", in which disks and mergers coexist, with 0.16(0.14)<Ktot<0.94(0.66). The Ktot frontier value that better classifies the highest numbers of disks and mergers, in agreement with their morphology, is Ktot=0.19(∼0.15): using this value the fractions of "well-classified disks" (Idisk) vs. "well classified mergers" (Imerger) are, respectively, ∼80% vs. ∼100%. The same results are obtained if we only consider the isolated disks as "true disks". When we apply our criteria to the high-z simulated systems, a lower total kinematic asymmetry frontier value (Ktot∼0.16(∼0.14)) is derived with respect to that found locally. The loss of angular resolution smears out the kinematic features, thus making objects to appear more kinematically regular (disky) than actually they are.

Abstract Copyright: © ESO, 2016

Journal keyword(s): Galaxy: evolution - Galaxy: kinematics and dynamics

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 ESO 244-12 PaG 01 18 08.31 -44 27 43.4           ~ 84 1
2 MCG-07-03-014 GiP 01 18 08.370 -44 27 43.29   14.43   13.06   ~ 76 0
3 NGC 633 EmG 01 36 23.418 -37 19 17.64   13.50   12.50   ~ 87 1
4 ESO 297-12 EmG 01 36 24.1505027520 -37 20 25.708312896   15.06   13.76 14.7 ~ 45 1
5 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 649 0
6 LEDA 17155 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 475 0
7 LEDA 89499 LIN 06 02 54.066 -71 03 10.48   15.6       ~ 85 1
8 IRAS 06076-2139 EmG 06 09 45.7858957392 -21 40 23.614857120   15.64   14.46   ~ 71 0
9 LEDA 89500 Sy2 06 21 01.188 -63 17 23.81   16.70   15.27   ~ 62 1
10 ESO 255-7 IG 06 27 22.588 -47 10 46.45   14.48   13.60   ~ 62 0
11 ESO 557-2 EmG 06 31 47.217 -17 37 17.09   15.03   13.21   ~ 61 0
12 IRAS 06592-6313 G 06 59 40.2750782328 -63 17 53.022471360   15.61   14.28   ~ 50 0
13 LEDA 90054 Sy2 07 03 24.2524870728 -60 15 22.448628792   16.02   14.72   ~ 54 1
14 NGC 2369 GiG 07 16 37.753 -62 20 37.51   13.23   11.56 12.3 ~ 123 0
15 2MASX J08370182-4954302 G 08 37 01.827 -49 54 30.27           ~ 54 0
16 ESO 432-6 IG 08 44 28 -31 41.8   16.4       ~ 28 0
17 ESO 60-16 G 08 52 30.77 -69 01 59.8           ~ 41 0
18 LEDA 24922 G 08 52 32.047 -69 01 55.74   16.01   15.17   ~ 37 0
19 2MASX J09041268-3627007 G 09 04 12.689 -36 27 00.76           ~ 77 0
20 IC 563 G 09 46 20.361 +03 02 43.86   14.7       ~ 84 0
21 IC 564 rG 09 46 21.0998750808 +03 04 17.078546964   14.1       ~ 89 0
22 NGC 3110 H2G 10 04 02.124 -06 28 29.12   13.4   13.3 12.5 ~ 162 3
23 IC 2545 IG 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 103 0
24 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 812 2
25 ESO 264-36 GiG 10 43 07.676 -46 12 44.50   14.34   12.55   ~ 70 0
26 ESO 264-57 G 10 59 01.794 -43 26 25.81   15.02   13.22   ~ 65 0
27 ESO 319-22 G 11 27 54.0785626512 -41 36 52.264754784   14.56   16.21   ~ 56 0
28 ESO 320-30 H2G 11 53 11.722 -39 07 48.72   13.30   11.86   ~ 172 1
29 ESO 440-58 IG 12 06 51.8 -31 56 47   15.44   14.89   ~ 57 0
30 ESO 267-30 G 12 14 12.839 -47 13 43.42   14.20   12.69 12.9 ~ 71 0
31 2MASX J12142211-5632332 G 12 14 22.0958120832 -56 32 33.317528712   16.8       ~ 54 0
32 MCG-02-33-098 G 13 02 19.5 -15 46 05   14       ~ 84 0
33 ESO 507-70 SyG 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24 13.59 ~ 113 0
34 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 461 1
35 IC 4518 Sy2 14 57 45.6 -43 07 58   14.5       ~ 70 0
36 IRAS 17138-1017 H2G 17 16 35.83992 -10 20 38.9832   17.43   14.59   ~ 123 0
37 IC 4686 G 18 13 38.7810951072 -57 43 57.306382932   14.67   13.52   ~ 62 1
38 IC 4687 AGN 18 13 39.829 -57 43 31.25   14.35 14.3 12.78   ~ 129 1
39 IC 4689 IG 18 13 40.334 -57 44 54.25   15.07   13.48   ~ 46 0
40 2MASX J21161852-4433374 G 21 16 18.5751072336 -44 33 37.139108652   17.48   16.24   ~ 26 1
41 NGC 7130 AGN 21 48 19.5412287192 -34 57 04.492024884   12.86 13.87 11.57   ~ 427 0
42 IC 5179 EmG 22 16 09.1191653256 -36 50 37.117603752   12.29 11.89 11.38   ~ 192 1
43 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 314 3
44 ESO 148-2 Sy2 23 15 46.772 -59 03 15.94   14.94 14.73 13.95   ~ 252 1

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2023.02.01-20:09:36

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