2018MNRAS.480.3257M

Query : 2018MNRAS.480.3257M

2018MNRAS.480.3257M - Mon. Not. R. Astron. Soc., 480, 3257-3278 (2018/November-1)

Kinematics and physical properties of the nearby galaxy NGC 4656 and its TDG candidate.

MUNOZ-ELGUETA N., TORRES-FLORES S., AMRAM P., HERNANDEZ-JIMENEZ J.A., URRUTIA-VISCARRA F., MENDES DE OLIVEIRA C. and GOMEZ-LOPEZ J.A.

Abstract (from CDS):

Interacting galaxies provide us with an excellent laboratory for studying a number of physical phenomena associated with these processes. In this paper, we present a spectroscopic and kinematic analysis of the interacting galaxy NGC 4656 and its companion tidal dwarf galaxy (TDG) candidate, NGC 4656UV. Using Fabry-Perot and GMOS multislit data, we investigated the possible origin of NGC 4656UV. We found that NGC 4656UV has a low metallicity (12 + log(O/H)∼8.2) and it follows the mass-metallicity relation for normal dwarf galaxies. For NGC 4656, we estimated a flat oxygen abundance gradient of β= -0.027 ±0.029 dex kpc–1, which suggests the presence of gas flows induced by gravitational interactions. By analysing radial velocity profiles and by fitting a kinematic model of the observed velocity field, we confirm the literature result that NGC 4656 consists of one single body instead of two objects. We estimated a dynamical mass of 6.81.8–0.6×109 M☉ and R of 12.1 kpc from the kinematic model of NGC 4656. Although the observed velocity field is dominated by rotation at large scales (Vmax/σ >=2.8), important non-rotational motions are present at small scales. Based on these new results, and on previously published information, we propose that NGC 4656 and 4656UV are a pair of interacting galaxies. NGC 4656UV is a companion of NGC 4656 and it does not have a tidal origin. The interaction between the two could have triggered the star formation in NGC 4656UV and increased the star formation in the north-east side of NGC 4656.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: individual: (NGC 4656) - galaxies: interactions - galaxies: kinematics and dynamics

Nomenclature: Table 3: [MTA2018] NN (Nos 1-60).

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 HCG 31 CGG 05 01 37 -04 15.4           ~ 132 0
5 Z 330-26 GiG 07 11 22.540 +71 50 10.94   13.1       ~ 71 0
6 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
7 NGC 4631 GiC 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1154 3
8 NGC 4646 GiG 12 42 52.1454845712 +54 51 21.510402480   13.8       ~ 40 0
9 [MTA2018] 56 HII 12 43 34.739 +32 05 15.36           ~ 1 0
10 [MTA2018] 57 HII 12 43 34.897 +32 04 01.92           ~ 1 0
11 [MTA2018] 37 HII 12 43 41.297 +32 06 36.43           ~ 1 0
12 [MTA2018] 41 HII 12 43 41.396 +32 05 30.73           ~ 1 0
13 [MTA2018] 45 HII 12 43 42.553 +32 06 19.29           ~ 1 0
14 [MTA2018] 58 HII 12 43 42.910 +32 06 16.89           ~ 1 0
15 [MTA2018] 36 HII 12 43 43.583 +32 07 24.89           ~ 1 0
16 [MTA2018] 50 HII 12 43 46.162 +32 07 41.30           ~ 1 0
17 [MTA2018] 59 HII 12 43 48.812 +32 08 12.76           ~ 1 0
18 [MTA2018] 60 HII 12 43 50.069 +32 08 13.23           ~ 1 0
19 [MTA2018] 49 HII 12 43 57.048 +32 10 10.56           ~ 1 0
20 NGC 4656 GiP 12 43 57.6889089768 +32 10 13.345914504   10.96 10.52     ~ 385 3
21 [MTA2018] 40 HII 12 43 58.130 +32 10 07.00           ~ 1 0
22 [MTA2018] 46 HII 12 43 58.432 +32 10 21.47           ~ 1 0
23 [MTA2018] 44 HII 12 43 59.098 +32 10 27.88           ~ 1 0
24 [MTA2018] 30 HII 12 43 59.136 +32 10 52.71           ~ 1 0
25 [MTA2018] 24 HII 12 43 59.918 +32 10 51.67           ~ 1 0
26 [MTA2018] 28 HII 12 44 02.435 +32 11 31.49           ~ 1 0
27 [MTA2018] 32 HII 12 44 02.555 +32 11 50.53           ~ 1 0
28 [MTA2018] 27 HII 12 44 02.830 +32 11 35.80           ~ 1 0
29 [MTA2018] 21 HII 12 44 03.225 +32 12 12.10           ~ 1 0
30 [MTA2018] 20 HII 12 44 03.812 +32 12 17.74           ~ 1 0
31 [MTA2018] 17 HII 12 44 04.581 +32 12 20.01           ~ 1 0
32 [MTA2018] 16 HII 12 44 06.692 +32 12 31.58           ~ 1 0
33 [MTA2018] 7 HII 12 44 07.389 +32 12 39.39           ~ 1 0
34 [MTA2018] 15 HII 12 44 07.575 +32 12 28.16           ~ 1 0
35 [MTA2018] 5 HII 12 44 09.003 +32 12 32.76           ~ 1 0
36 [MTA2018] 13 HII 12 44 10.788 +32 12 27.18           ~ 1 0
37 NGC 4657 H2G 12 44 11.1670559544 +32 12 21.714186852           ~ 19 0
38 [MTA2018] 1 HII 12 44 11.513 +32 12 14.37           ~ 1 0
39 [MTA2018] 2 HII 12 44 11.564 +32 12 23.65           ~ 1 0
40 [MTA2018] 12 HII 12 44 11.568 +32 12 29.31           ~ 1 0
41 NGC 4656UV G 12 44 14.794 +32 16 48.26           ~ 17 1
42 [DUM2012] NGC 4656 8 HII 12 44 19.416 +32 18 44.89           ~ 2 0
43 [DUM2012] NGC 4656 5 HII 12 44 19.845 +32 16 51.42           ~ 2 0
44 [MTA2018] 11 HII 12 44 20.343 +32 17 41.99           ~ 1 0
45 HD 340611 WD* 20 34 21.8847019255 +25 03 49.750446346 10.687 11.471 11.546 11.648 11.728 DA2.4 329 0
46 NAME NGC 4631 Group GrG ~ ~           ~ 21 0

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