2018A&A...610A...8M


Query : 2018A&A...610A...8M

2018A&A...610A...8M - Astronomy and Astrophysics, volume 610A, 8-8 (2018/2-1)

Galaxy evolution in groups. NGC 3447/NGC 3447A: the odd couple in LGG 225.

MAZZEI P., MARINO A., RAMPAZZO R., PLANA H., ROSADO M. and ARIAS L.

Abstract (from CDS):

Context. Local Group (LG) analogs (LGAs) are galaxy associations dominated by a few bright spirals reminiscent of the LG. The NGC 3447/NGC 3447A system is a member of the LGG 225 group, a nearby LGA. This system is considered a physical pair composed of an intermediate-luminosity late-type spiral, NGC 3447 itself, and an irregular companion, NGC 3447A, linked by a faint, short filament of matter. A ring-like structure in the NGC 3447 outskirts has been emphasised by Galaxy Evolution Explorer (GALEX) observations.
Aims. This work aims to contribute to the study of galaxy evolution in low-density environments, a favourable habitat to highly effective encounters, shedding light on the evolution of the NGC 3447/NGC 3447A system.
Methods. We performed a multi-λ analysis of the surface photometry of this system to derive its spectral energy distribution and structural properties using ultraviolet (UV), Swift UVOT, and optical Sloan Digital Sky Survey (SDSS) images complemented with available far-IR observations. We also characterised the velocity field of the pair using two-dimensional Hα kinematical observations of the system obtained with PUMA Fabry-Perot interferometer at the 2.1m telescope of San Pedro Martir (Mexico). All these data are used to constrain smooth particle hydrodynamic simulations with chemo-photometric implementation to shed light on the evolution of this system.
Results. The luminosity profiles, from UV to optical wavelengths, are all consistent with the presence of a disc extending and including NGC 3447A. The overall velocity field does not emphasise any significant rotation pattern, rather a small velocity gradient between NGC 3447 and NGC 3447A. Our simulation, detached from a large grid explored to best-fit the global properties of the system, suggests that this arises from an encounter between two halos of equal mass.
Conclusions. NGC 3447 and NGC 3447A belong to the same halo, NGC 3447A being a substructure of the same disk including NGC 3447. The halo gravitational instability, enhanced by the encounter, fuels a long-lived instability in this dark-matter-dominated disk, driving the observed morphology. The NGC 3447/NGC 3447A system may warn of a new class of "false pairs" and the potential danger of a misunderstanding of such objects in pair surveys that could produce a severe underestimate of the total mass of a system.

Abstract Copyright: © ESO, 2018

Journal keyword(s): galaxies: groups: individual: LGG 225 - galaxies: individual: NGC 3447/NGC 3447A - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: photometry - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/610/A8): list.dat fits/*>

CDS comments: Table A.2 AGC 219617 not in SIMBAD.

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12634 1
3 NGC 1533 EmG 04 09 51.8356041744 -56 07 06.410207352   11.77 10.92 10.27 11.0 ~ 198 0
4 ESO 376-4 Sy2 10 40 20.5973673864 -36 24 40.077261792   13.47   12.25 12.7 ~ 55 0
5 NGC 3347 EmG 10 42 46.6312655976 -36 21 11.738456136   12.18 11.35 10.90   ~ 69 0
6 NGC 3370 GiG 10 47 04.0734572856 +17 16 25.315359780   12.4       ~ 251 0
7 UGC 5945 GiG 10 50 25.5402723480 +17 33 51.092678520   15.1       ~ 22 0
8 UGC 5947 AG? 10 50 30.00 +19 38 34.4   15.0       ~ 34 0
9 UGC 5948 AG? 10 50 37.886 +15 45 48.61   17       ~ 16 0
10 SDSS J105148.64+194605.4 AG? 10 51 48.644 +19 46 05.45           ~ 4 0
11 SDSS J105204.79+150149.7 AG? 10 52 04.791 +15 01 49.65           ~ 13 0
12 MCG+03-28-023 GiG 10 52 21.3714387480 +17 56 06.954010728   15.2       ~ 15 0
13 UGC 5989 AG? 10 52 31.934 +19 47 31.83   14.2       ~ 40 0
14 SDSS J105234.93+170841.7 AG? 10 52 34.933 +17 08 41.76           ~ 8 0
15 NGC 3443 GiG 10 53 00.117 +17 34 25.06   14.7       ~ 54 0
16 NGC 3447 GiP 10 53 23.9671116744 +16 46 20.741661336   14.3       ~ 97 0
17 LEDA 4578229 AG? 10 53 29.588 +16 43 59.61           ~ 6 0
18 LGG 225 GrG 10 54 00 +17 05.4           ~ 12 0
19 UGC 6022 AG? 10 54 15.333 +17 48 36.89   17       ~ 19 0
20 NGC 3454 GiP 10 54 29.458 +17 20 38.58   14.1       ~ 117 0
21 NGC 3455 GiP 10 54 31.0921117824 +17 17 04.985473704   13.1       ~ 163 0
22 AGC 208602 G 10 54 37.4 +17 38 06           ~ 6 0
23 NGC 3457 GiG 10 54 48.6357589320 +17 37 16.420097712   13.0       ~ 99 0
24 LEDA 1533359 GiP 10 55 06.666 +17 27 45.55           ~ 14 0
25 UGC 6035 GiG 10 55 29.110 +17 08 33.08   15.2       ~ 35 0
26 2MASX J10554442+1700183 GiG 10 55 44.425 +17 00 18.35   15.1       ~ 17 0
27 LEDA 4257755 AG? 10 56 19.931 +17 05 05.97           ~ 8 0
28 LEDA 4573180 AG? 10 56 38.656 +17 23 01.26           ~ 8 0
29 SDSS J105741.23+191321.0 AG? 10 57 41.230 +19 13 21.06           ~ 3 0
30 UGC 6083 LSB 11 00 23.794 +16 41 31.76   15.2       ~ 43 0
31 LEDA 4260762 AG? 11 00 47.145 +16 52 55.52           ~ 6 0
32 UGC 6095 AG? 11 01 04.692 +19 06 07.22   17       ~ 14 0
33 UGC 6112 GiG 11 02 35.229 +16 44 05.18   14.5       ~ 44 0
34 NGC 3501 GiP 11 02 47.307 +17 59 22.31   13.8       ~ 142 0
35 SDSS J110306.60+200336.6 AG? 11 03 06.606 +20 03 36.66           ~ 6 0
36 NGC 3507 GiP 11 03 25.3619733360 +18 08 07.607343732   11.4       ~ 184 0
37 LEDA 87171 LSB 11 03 26.345 +16 00 58.22   16.33       ~ 17 0
38 LEDA 4263693 AG? 11 04 56.817 +17 38 30.49           ~ 4 0
39 MCG+03-28-056 LSB 11 05 32.534 +17 38 22.85   14.9       ~ 24 0
40 UGC 6151 GiC 11 05 56.2923063720 +19 49 34.555257336 14.52 14.80 14.39     ~ 60 1
41 LEDA 1558217 AG? 11 06 27.285 +18 23 24.03           ~ 8 0
42 NGC 3522 GiG 11 06 40.4644062552 +20 05 07.900946304   14.13       ~ 105 1
43 SDSS J110651.09+173002.8 AG? 11 06 51.094 +17 30 02.85           ~ 4 0
44 UGC 6171 GiG 11 07 10.335 +18 34 14.48   15.1       ~ 40 0
45 UGC 6181 GiG 11 07 46.431 +19 33 01.79   14.70       ~ 53 1
46 NGC 3626 GiG 11 20 03.8069651160 +18 21 24.543304164   11.2       ~ 258 0
47 NAME Local Group GrG ~ ~           ~ 8378 0
48 KPG 257 PaG ~ ~           ~ 2 0
49 NAME Leo Cloud Cld ~ ~           ~ 60 0

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