2010A&A...517A..28M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST18:56:39

2010A&A...517A..28M - Astronomy and Astrophysics, volume 517, A28-28 (2010/7-1)

VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. II. Evidence for shock ionization caused by tidal forces in the extra-nuclear regions of interacting and merging LIRGs.

MONREAL-IBERO A., ARRIBAS S., COLINA L., RODRIGUEZ-ZAURIN J., ALONSO-HERRERO A. and GARCIA-MARIN M.

Abstract (from CDS):

Luminous infrared galaxies (LIRGs) are an important class of objects in the low-z universe bridging the gap between normal spirals and the strongly interacting and starbursting ultraluminous infrared galaxies (ULIRGs). Since a large fraction of the stars in the Universe have been formed in these objects, LIRGs are also relevant in a high-z context. Studies of the two-dimensional physical properties of LIRGs are still lacking. We aim to understand the nature and origin of the ionization mechanisms operating in the extra-nuclear regions of LIRGs as a function of the interaction phase and infrared luminosity. This study uses optical integral field spectroscopy (IFS) data obtained with VIMOS. Our analysis is based on over 25300 spectra of 32 LIRGs covering all types of morphologies (isolated galaxies, interacting pairs, and advanced mergers), and the entire 1011-1012L infrared luminosity range. We found strong evidence for shock ionization, with a clear trend with the dynamical status of the system. Specifically, we quantified the variation with interaction phase of several line ratios indicative of the excitation degree. While the [NII]λ6584/Hα ratio does not show any significant change, the [SII]λλ6717,6731/Hα and [OI]λ6300/Hα ratios are higher for more advanced interaction stages. Velocity dispersions are higher than in normal spirals and increase with the interaction class (medians of 37, 46, and 51km/s for class 0-2, respectively). We constrained the main mechanisms causing the ionization in the extra-nuclear regions (typically for distances ranging from ∼0.2-2.1kpc to ∼0.9-13.2kpc) using diagnostic diagrams. Isolated systems are mainly consistent with ionization caused by young stars. Large fractions of the extra-nuclear regions in interacting pairs and more advanced mergers are consistent with ionization caused by shocks of vs≲200km/s. This is supported by the relation between the excitation degree and the velocity dispersion of the ionized gas, which we interpret as evidence for shock ionization in interacting galaxies and advanced mergers but not in isolated galaxies. This relation does not show any dependence with the infrared luminosity (i.e. the level of star formation). All this indicates that tidal forces play a key role in the origin of the ionizing shocks in the extra-nuclear regions. We also showed for the first time what appears to be a common log([Oi]λ6300/Hα) - log(σ) relation for the extranuclear ionized gas in interacting (U)LIRGs (i.e. covering the entire 1011.0-1012.3L luminosity range). This preliminary result needs to be investigated further with a larger sample of ULIRGs.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: interactions - galaxies: starburst - infrared: galaxies

CDS comments: Paragraph 2.2 IRAS F12116-5610 is a misprint for IRAS 12116-5615. Paragraph 3.1 IRAS F07160-5744 is a misprint for IRAS F07160-6215. Paragraph 3.4 IRAS 13229-3934 is a misprint fot IRAS 13229-2934.

Simbad objects: 48

goto Full paper

goto View the reference in ADS

Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ESO 244-12 PaG 01 18 08.31 -44 27 43.4           ~ 82 1
2 MCG-07-03-014 GiP 01 18 08.370 -44 27 43.29   14.43   13.06   ~ 72 0
3 NGC 633 EmG 01 36 23.418 -37 19 17.64   13.50   12.50   ~ 77 1
4 ESO 297-12 EmG 01 36 24.1494524571 -37 20 25.707473821   15.06   13.76 14.7 ~ 41 1
5 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 601 0
6 IRAS 06076-2139 EmG 06 09 45.7859423135 -21 40 23.516504022   15.64   14.46   ~ 62 0
7 ESO 255-7 IG 06 27 22.588 -47 10 46.45   14.48   13.60   ~ 60 0
8 ESO 557-2 EmG 06 31 47.217 -17 37 17.09   15.03   13.21   ~ 57 0
9 IRAS 06592-6313 G 06 59 40.2744312709 -63 17 53.028333205   15.61   14.28   ~ 48 0
10 2MASX J07032428-6015221 Sy2 07 03 24.2520923348 -60 15 22.465765682   16.02   14.72   ~ 50 1
11 NGC 2369 GiG 07 16 37.753 -62 20 37.51   13.23   11.56 12.3 ~ 115 0
12 2MASX J08370182-4954302 G 08 37 01.827 -49 54 30.27           ~ 50 0
13 LEDA 24552 G 08 44 27.2 -31 41 51   16.4       ~ 23 0
14 ESO 432-6 IG 08 44 28 -31 41.8   16.4       ~ 27 0
15 2MASX J08442894-3141307 G 08 44 28.949 -31 41 30.75           ~ 25 0
16 ESO 60-16 G 08 52 30.77 -69 01 59.8           ~ 39 0
17 2MASX J08523204-6901557 G 08 52 32.047 -69 01 55.74   16.01   15.17   ~ 30 0
18 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 364 1
19 IC 563 IG 09 46 20.361 +03 02 43.86   14.7       ~ 74 1
20 IC 564 rG 09 46 21.094 +03 04 16.86   14.1       ~ 78 0
21 NGC 3110 H2G 10 04 02.124 -06 28 29.12   13.4   13.3 12.5 ~ 143 3
22 IC 2545 IG 10 06 04.581 -33 53 05.55   15.27 14.27 14.25   ~ 94 0
23 NVSS J102000+081335 rG 10 20 00.204 +08 13 33.78   17.5       ~ 143 1
24 NGC 3256 IG 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 755 2
25 ESO 264-36 GiG 10 43 07.676 -46 12 44.50   14.34   12.55   ~ 64 0
26 ESO 264-57 G 10 59 01.794 -43 26 25.81   15.02   13.22   ~ 62 0
27 ESO 319-22 G 11 27 54.0796301424 -41 36 52.248094984   14.56   16.21   ~ 50 0
28 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 883 4
29 ESO 320-30 H2G 11 53 11.722 -39 07 48.72   13.30   11.86   ~ 153 1
30 MCG-05-29-017 EmG 12 06 51.870 -31 56 58.75   14.65   13.54   ~ 31 0
31 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 311 1
32 ESO 267-30 G 12 14 12.839 -47 13 43.42   14.20   12.69 12.9 ~ 66 0
33 2MASX J12142211-5632332 G 12 14 22.0941848886 -56 32 33.341502495   16.8       ~ 49 0
34 MCG-02-33-098 G 13 02 19.5 -15 46 05   14       ~ 77 0
35 ESO 507-70 SyG 13 02 52.354 -23 55 17.65   14.77 14.78 13.24   ~ 102 0
36 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 426 1
37 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3783 4
38 2MASX J14373831-1500239 Sy1 14 37 38.317 -15 00 23.97   16.58 16.40     ~ 244 1
39 IC 4518 Sy2 14 57 45.6 -43 07 58   14.5       ~ 63 0
40 IRAS 15206+3342 Sy2 15 22 38.0716 +33 31 36.189           ~ 93 0
41 2MASX J15265942+3558372 LIN 15 26 59.425 +35 58 37.23   15.61       ~ 243 1
42 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2683 4
43 LEDA 59990 H2G 17 16 35.7 -10 20 38   15.53       ~ 108 0
44 6dFGS gJ172322.0-001701 LIN 17 23 21.943 -00 17 00.96   15.1       ~ 373 0
45 IC 4687 AGN 18 13 39.829 -57 43 31.25   14.35 14.3 12.78   ~ 117 1
46 NGC 7130 AGN 21 48 19.490 -34 57 04.73   12.86 13.87 11.57   ~ 383 0
47 IC 5179 EmG 22 16 09.1156883076 -36 50 37.102745221   12.29 11.89 11.38   ~ 176 1
48 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1889 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2010A&A...517A..28M and select 'bookmark this link' or equivalent in the popup menu


2020.07.16-18:56:39

© Université de Strasbourg/CNRS

    • Contact