2020A&A...634A.102P


Query : 2020A&A...634A.102P

2020A&A...634A.102P - Astronomy and Astrophysics, volume 634A, 102-102 (2020/2-1)

Star formation in outer rings of S0 galaxies. II. NGC 4513 - a multi-spin ringed S0 galaxy.

PROSHINA I., SIL'CHENKO O. and MOISEEV A.

Abstract (from CDS):

Aims. Although S0 galaxies are often thought to be "red and dead", they frequently demonstrate star formation organised in ring structures. We try to clarify the nature of this phenomenon and its difference from star formation in spiral galaxies. Here we study the moderate-luminosity nearby S0 galaxy, NGC 4513. Methods. By applying long-slit spectroscopy along the major axis of NGC 4513, we measured gas and star kinematics, Lick indices for the main body of the galaxy, and strong emission-line flux ratios in the ring. After inspecting the gas excitation in the ring using the line ratios diagnostic diagrams and showing that it is ionised by young stars, we determined the gas oxygen abundance using popular strong-line calibration methods. We estimated the star formation rate (SFR) in the outer ring using the archival Galaxy Evolution Explorer (GALEX) ultraviolet images of the galaxy. Results. The ionised gas counter-rotates the stars over the whole extension of NGC 4513 suggesting that it is being accreted from outside. The gas metallicity in the ring is slightly subsolar, [O/H]=-0.2dex, matching the metallicity of the stellar component of the main galactic disc. However the stellar component of the ring is much more massive than can be explained by the current star formation level in the ring. We conclude that the ring of NGC 4513 is probably the result of tidal disruption of a massive gas-rich satellite, or may be the consequence of a long star-formation event provoked by gas accretion from a cosmological filament that started some 3Gyr ago.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: evolution - galaxies: elliptical and lenticular, cD - galaxies: structure - galaxies: star formation

Simbad objects: 8

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Number of rows : 8
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 NGC 2551 GiG 08 24 50.2699218936 +73 24 43.353747900   13.10 12.11     ~ 75 1
2 HD 102328 * 11 46 55.6222860288 +55 37 41.480416020   6.528 5.254     K2.5IIIbCN1 145 0
3 NGC 4513 G 12 32 01.5342528120 +66 19 57.331264404   14.1       ~ 45 0
4 VV 788 Sy1 12 32 05.0 +66 24 12   15.6       ~ 50 0
5 LEDA 2683704 G 12 36 02.295 +66 06 17.83           ~ 4 0
6 LAWD 52 WD* 13 38 50.4780906644 +70 17 07.640657534 11.807 12.54 12.60 13.01 12.979 DA2.4 207 0
7 NGC 6534 G 17 56 08.5680428976 +64 17 01.506140628   15.5       ~ 17 0
8 MCG+11-22-015 GiG 17 56 43.0305103824 +65 15 46.839794400   15.6       ~ 13 0

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2022.08.18-03:43:07

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