2015MNRAS.453.2808O


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST19:23:06

2015MNRAS.453.2808O - Mon. Not. R. Astron. Soc., 453, 2808-2823 (2015/November-1)

NGC 6845: metallicity gradients and star formation in a complex compact group.

OLAVE-ROJAS D., TORRES-FLORES S., CARRASCO E.R., MENDES DE OLIVEIRA C., DE MELLO D.F. and SCARANO S.Jr

Abstract (from CDS):

We have obtained Gemini/Gemini Multi-Object Spectrograph spectra of 28 regions located across the interacting group NGC 6845, spanning from the inner regions of the four major galaxies (NGC 6845A, B, C, D) to the tidal tails of NGC 6845A. All regions in the tails are star-forming objects with ages younger than 10 Myr. We derived the gas-phase metallicity gradients across NGC 6845A and its two tails and we find that these are shallower than those for isolated galaxies. NGC 6845A has a gas-phase oxygen central metallicity of 12 + log(O/H) ∼ 8.5 and a flat gas-phase metallicity gradient (β = 0.002±0.004 dex/kpc) out to ∼ 4R25 (to the end of the longest tidal tail). Considering the mass-metallicity relation, the central region of NGC 6845A displays a lower oxygen abundance than the expected for its mass. Taking into account this fact and considering the flat oxygen distribution measured along the eastern tidal tail, we suggest that an interaction event has produced a dilution in the central metallicity of this galaxy and the observed flattening in its metal distribution. We found that the star formation process along the eastern tidal structure has not been efficient enough to increase the oxygen abundances in this place, suggesting that this structure was formed from enriched material.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: abundances - galaxies: interactions - intergalactic medium - galaxies: star clusters: general - galaxies: star formation

Simbad objects: 18

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Number of rows : 18

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 NGC 92 GiC 00 21 31.713 -48 37 29.23   13.71   12.40   ~ 39 0
2 NGC 1512 GiP 04 03 54.281 -43 20 55.86 11.30 11.43 10.54 10.37   ~ 327 1
3 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 435 3
4 NGC 2856 GiP 09 24 16.0152501758 +49 14 57.081924052   14.10       ~ 77 2
5 NAME Great Attractor SCG 10 32 -46.0           ~ 471 0
6 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 494 3
7 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1562 0
8 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 297 0
9 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3832 4
10 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2575 2
11 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2701 4
12 6dFGS gJ200053.6-470543 GiG 20 00 53.547 -47 05 42.43   15.5       ~ 9 1
13 6dFGS gJ200056.8-470504 GiG 20 00 56.843 -47 05 04.01   14.52   13.03   ~ 18 0
14 NGC 6845 IG 20 00 58.418 -47 04 13.02   15.81 12.16 14.33   ~ 34 1
15 NAME NGC 6845 Quartet CGG 20 00 59.0 -47 04 38           ~ 14 0
16 2MASX J20010526-4703340 GiC 20 01 05.2777529234 -47 03 33.851980980   17.18 14.28 15.70   ~ 14 0
17 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 377 1
18 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-19:23:06

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