2023A&A...671A...8D


Query : 2023A&A...671A...8D

2023A&A...671A...8D - Astronomy and Astrophysics, volume 671A, 8 (2023/3-1)

A new method for age-dating the formation of bars in disc galaxies The TIMER view on NGC1433's old bar and the inside-out growth of its nuclear disc.

DE SA-FREITAS C., FRAGKOUDI F., GADOTTI D.A., FALCON-BARROSO J., BITTNER A., SANCHEZ-BLAZQUEZ P., VAN DE VEN G., BIERI R., COCCATO L., COELHO P., FAHRION K., GONCALVES G., KIM T., DE LORENZO-CACERES A., MARTIG M., MARTIN-NAVARRO I., MENDEZ-ABREU J., NEUMANN J. and QUEREJETA M.

Abstract (from CDS):

The epoch in which galactic discs settle is a major benchmark for testing models of galaxy formation and evolution but remains largely unknown. Once discs settle and become sufficiently self-gravitating, stellar bars are able to form; therefore, determining the ages of bars can shed light on the epoch of disc settling, and on the onset of secular evolution. Nevertheless, timing when the bar formed has proven challenging. In this work we present a new methodology for obtaining the bar age, using the star formation history of nuclear discs. Nuclear discs are rotation-supported structures, built by gas pushed to the centre via bar-induced torques, and their formation is thus coincident with bar formation. In particular, we used integral field spectroscopic data from the TIMER survey to disentangle the star formation history of the nuclear disc from that of the underlying main disc, which enables us to more accurately determine when the nuclear disc formed. We demonstrate the methodology on the galaxy NGC 1433 - which we find to host an old bar that is $ 7.5^{+1.6}_{-1.1}\rm{(sys)}^{+0.2}_{-0.5}\rm{(stat)} $ Gyr old - and describe a number of tests carried out on both the observational data and numerical simulations. In addition, we present evidence that the nuclear disc of NGC 1433 grows in accordance with an inside-out formation scenario. This methodology is applicable to high-resolution integral field spectroscopic data of barred galaxies with nuclear discs, making it ideally suited for the TIMER survey sample. In the future we will thus be able to determine the bar age for a large sample of galaxies, shedding light on the epoch of disc settling and bar formation.

Abstract Copyright: © The Authors 2023

Journal keyword(s): galaxies: bulges - galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: structure

Simbad objects: 11

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Number of rows : 11
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 NGC 1084 GiG 02 45 59.926 -07 34 43.10 11.22 11.59 10.73 10.55 11.1 ~ 368 2
2 NGC 1269 EmG 03 17 18.5785534752 -41 06 28.628735184 9.85 9.83 8.81 8.72   ~ 423 1
3 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 430 1
4 NGC 1433 Sy2 03 42 01.4847418992 -47 13 18.929092656   10.84 9.99 9.61 10.2 ~ 388 0
5 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 153 0
6 SMACS J0723.3-7327 ClG 07 23 13.3 -73 27 25           ~ 152 0
7 NGC 4371 GiG 12 24 55.4333579760 +11 42 15.144247584 12.35 11.79 10.81     ~ 320 1
8 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
9 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4816 2
10 NGC 5850 LIN 15 07 07.6828131840 +01 32 39.513281352   11.5   10.79 11.1 ~ 316 1
11 NGC 6032 GiG 16 03 01.1201862024 +20 57 21.239605764   15.0       ~ 66 0

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