2006AJ....132...71H


Query : 2006AJ....132...71H

2006AJ....132...71H - Astron. J., 132, 71-84 (2006/July-0)

The effects of interactions on the structure and morphology of elliptical/lenticular galaxies in pairs.

HERNANDEZ-TOLEDO H.M., AVILA-REESE V., SALAZAR-CONTRERAS J.R. and CONSELICE C.J.

Abstract (from CDS):

We present a structural and photometric analysis of 42 elliptical/lenticular galaxies in E/S0 + S pairs observed in the BVRI color bands. The aim of the analysis is to empirically determine the effects of interactions on the galaxies' morphology, structure, and stellar populations as seen from the CAS parameters (light concentration C, asymmetry A, and clumpiness S). We further compare these values to a control sample of 67 mostly isolated noninteracting E/S0 galaxies. We find that the paired E/S0 galaxies occupy more scattered loci in CAS space than noninteracting E/S0s and that the structural effects of interactions on E/S0s are minor, in contrast to disk galaxies involved in interactions. This suggests that observational methods for recognizing interactions, such the CAS methodology of Conselice, would not detect E/S0s involved in interactions (related to early phases of the so-called dry mergers), and that the majority of interacting galaxies identified at high redshift must be gas-dominated systems. However, we find statistical differences in the asymmetry index when comparing isolated and interacting E/S0s. On average, paired E/S0 galaxies have A-values 2.96±0.72 times larger than those of noninteracting E/S0s. For the subset of presumably strongly interacting E/S0s, A and S can be several times larger than the typical values of the isolated E/S0s. We show that the asymmetries are consistent with several internal and external morphological distortions. We conclude that the subsample of interacting E/S0s should be dense, gas-poor galaxies in systems spanning a wide range of interaction stages, with typical merging timescales ≳0.1-0.5 Gyr. We use the observed phenomenology of this subsample to predict the approximate loci of dry premergers in the CAS parameter space.

Abstract Copyright:

Journal keyword(s): Galaxies: Elliptical and Lenticular, cD - Galaxies: Interactions - Galaxies: Photometry - Galaxies: Structure

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 - 2022
#notes
1 MCG+02-04-022 GiP 01 19 24.5861965632 +12 27 42.832475532   15.2       ~ 20 1
2 NGC 608 GiP 01 35 28.2303873864 +33 39 24.251720976   14.0       ~ 27 0
3 NGC 614 GiP 01 35 52.2323077656 +33 40 55.132781952   13.9       ~ 28 0
4 IC 1785 GiP 02 16 21.0068008752 +32 39 59.400261108   15.6       ~ 14 0
5 NGC 875 LIN 02 17 04.7798595576 +01 14 39.085814148   14.2       ~ 44 0
6 NGC 1143 IG 02 55 09.7142741256 -00 10 40.248085584   13.2       ~ 140 1
7 2MASX J02561772+7505179 GiP 02 56 17.6984021544 +75 05 17.650089600   15.7       ~ 10 0
8 NGC 1161 Sy1 03 01 14.1715734192 +44 53 50.674920288   13.20 12.08     ~ 72 1
9 NGC 1634 GiP 04 40 09.7809841800 +07 20 19.491680256   15.0       ~ 22 0
10 UGC 3765 GiP 07 16 01.952 +56 49 05.09   14.3       ~ 19 0
11 2MASX J08235011+1133011 GiP 08 23 50.1248981136 +11 33 01.300157172   15.2       ~ 13 0
12 MCG+11-11-041 GiP 09 12 09.9641196480 +66 53 53.460347460   15.40 14.41     ~ 10 0
13 NGC 2872 IG 09 25 42.5308974048 +11 25 55.727649480   13.0       ~ 82 0
14 NVSS J101634+123908 rG 10 16 34.9069382160 +12 39 06.466123656   14.46 13.61     ~ 21 0
15 NGC 3226 GiP 10 23 27.0064075320 +19 53 54.674937420   14.32 13.33     ~ 413 1
16 NGC 3286 rG 10 36 21.2511276816 +58 37 12.546505488   14.50 13.67     ~ 29 0
17 MCG+05-26-025 GiP 10 52 18.4900651944 +30 04 20.969881176   14.6       ~ 20 0
18 UGC 6071 LIN 10 59 59.5517447472 +50 03 23.866197264   14.4       ~ 32 0
19 NGC 3894 SyG 11 48 50.3462619432 +59 24 56.450580480   12.9   11.57   ~ 226 1
20 NGC 4447 LIN 12 28 12.5278771992 +13 53 57.186708756   15.2       ~ 34 0
21 M 60 GiP 12 43 39.9708251928 +11 33 09.688174056   10.3       ~ 1308 1
22 2MASX J13012450+2918306 AGN 13 01 24.5106736152 +29 18 30.139350300   15.93 14.99 12.91   ~ 43 0
23 NGC 5262 GiP 13 35 38.6055452832 +75 02 21.903944388   14.41 13.65     ~ 14 0
24 UGC 8689 LIN 13 44 23.1876635784 +05 47 32.612055108   14.12 13.19     ~ 30 0
25 2MASX J13443706+3710185 SyG 13 44 37.0394366832 +37 10 17.944302288   15.6       ~ 17 0
26 NGC 5296 GiP 13 46 18.6480301296 +43 51 04.765848516   15.0       ~ 56 0
27 UGC 8941 S GiP 14 01 42.18 +33 49 18.6   15       ~ 18 0
28 IC 970 LIN 14 02 34.2090802608 +14 33 09.151961364   14.7       ~ 31 0
29 NGC 5481 G 14 06 41.2682134344 +50 43 23.823257124   13.5       ~ 117 0
30 NGC 5507 GiP 14 13 19.8600321120 -03 08 56.000082660   13.30 12.46     ~ 105 0
31 MCG+13-11-002 GiP 14 34 34.9405426272 +77 57 59.697439236   14.9       ~ 13 0
32 MCG+08-27-018 LIN 14 41 17.095 +44 28 43.47   14.50 13.69     ~ 32 0
33 UGC 9602 SyG 14 55 55.2696190800 +11 51 41.473070532   14.9       ~ 44 0
34 NGC 5912 GiP 15 11 41.056 +75 23 05.70   13.84 12.98     ~ 19 0
35 NGC 6080 G 16 12 58.4 +02 10 37           ~ 11 0
36 2MASX J16125951+0210528 GiP 16 12 59.5164082248 +02 10 52.385944008   14.1       ~ 19 0
37 NGC 6501 GiP 17 56 03.7387070789 +18 22 22.933662437   13.4       ~ 69 0
38 MCG+09-32-008 GiP 19 31 10.3317841872 +54 05 32.695607760   16       ~ 15 0
39 NGC 6964 G 20 47 24.3022751472 +00 18 02.971919412 14.51 14.00 12.99     ~ 82 1
40 UGC 11680 Sy2 21 07 44.1 +03 52 31           ~ 88 0
41 Mrk 897 AGN 21 07 45.894 +03 52 39.50   15.39 14.76     ~ 98 1
42 MCG+03-54-002 GiP 21 08 21.2297828496 +18 12 00.808216308   14.9       ~ 18 0
43 MCG+02-58-006 GiP 22 45 59.2033345824 +10 52 03.006432408   15.6       ~ 15 0
44 NGC 7752 GiP 23 46 58.557 +29 27 32.17   14.3       ~ 124 0

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2022.09.26-08:47:16

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