2020A&A...643A..14G


Query : 2020A&A...643A..14G

2020A&A...643A..14G - Astronomy and Astrophysics, volume 643A, 14-14 (2020/11-1)

Kinematic signatures of nuclear discs and bar-driven secular evolution in nearby galaxies of the MUSE TIMER project.

GADOTTI D.A., BITTNER A., FALCON-BARROSO J., MENDEZ-ABREU J., KIM T., FRAGKOUDI F., DE LORENZO-CACERES A., LEAMAN R., NEUMANN J., QUEREJETA M., SANCHEZ-BLAZQUEZ P., MARTIG M., MARTIN-NAVARRO I., PEREZ I., SEIDEL M.K. and VAN DE VEN G.

Abstract (from CDS):

The central regions of disc galaxies hold clues to the processes that dominate their formation and evolution. To exploit this, the TIMER project has obtained high signal-to-noise and spatial resolution integral-field spectroscopy data of the inner few kpc of 21 nearby massive barred galaxies, which allows studies of the stellar kinematics in their central regions with unprecedented spatial resolution. We confirm theoretical predictions of the effects of bars on stellar kinematics and identify box/peanuts through kinematic signatures in mildly and moderately inclined galaxies, finding a lower limit to the fraction of massive barred galaxies with box/peanuts at ∼62%. Further, we provide kinematic evidence of the connection between barlenses, box/peanuts, and bars. We establish the presence of nuclear discs in 19 galaxies and show that their kinematics are characterised by near-circular orbits with low pressure support and that they are fully consistent with the bar-driven secular evolution picture for their formation. In fact, we show that these nuclear discs have, in the region where they dominate, larger rotational support than the underlying main galaxy disc. In addition, we define a kinematic radius for the nuclear discs and show that it relates to bar radius, ellipticity and strength, and bar-to-total ratio. Comparing our results with photometric studies of galaxy bulges, we find that careful, state-of-the-art galaxy image decompositions are generally able to discern nuclear discs from classical bulges if the images employed have high enough physical spatial resolution. In fact, we show that nuclear discs are typically identified in such image decompositions as photometric bulges with (near-)exponential profiles. However, we find that the presence of composite bulges (galaxies hosting both a classical bulge and a nuclear disc) can often be unnoticed in studies based on photometry alone and suggest a more stringent threshold to the Sersic index to identify galaxies with pure classical bulges.

Abstract Copyright: © ESO 2020

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

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 613 AGN 01 34 18.235 -29 25 06.56   10.77 12.71 9.50 10.6 ~ 365 3
2 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1215 3
3 NGC 1269 GiG 03 17 18.600 -41 06 29.05 9.85 9.83 8.81 8.72   ~ 381 1
4 NGC 1300 GiP 03 19 41.0453355271 -19 24 40.141850719   11.16 10.42 9.90 10.7 ~ 462 0
5 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1582 2
6 NGC 1433 GiG 03 42 01.553 -47 13 19.49   10.84 9.99 9.61 10.2 ~ 316 0
7 NGC 2300 IG 07 32 20.486 +85 42 31.90   12.2       ~ 318 0
8 M 95 GiP 10 43 57.69173 +11 42 13.6274 10.71 10.51 9.73 9.48   M0 985 2
9 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 905 2
10 NGC 4371 GiG 12 24 55.430 +11 42 15.44 12.35 11.79 10.81     ~ 294 1
11 NGC 4643 LIN 12 43 20.134 +01 58 42.24   11.9       ~ 248 0
12 NGC 4981 GiG 13 08 48.7428114624 -06 46 38.929483079   12.1   10.91 11.7 ~ 149 0
13 NGC 4984 GiG 13 08 57.213 -15 30 58.67   12   10.92   ~ 120 0
14 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2310 2
15 NGC 5248 GiG 13 37 32.069 +08 53 06.22   11.4       ~ 467 0
16 NGC 5728 Sy2 14 42 23.928 -17 15 11.41   14.34 13.40     ~ 529 0
17 NGC 5850 LIN 15 07 07.676 +01 32 39.41   11.5   10.79 11.1 ~ 293 1
18 NGC 6902 GiG 20 24 28.0654195725 -43 39 12.429965263 11.73 11.82 10.93 10.59 11.4 ~ 112 1
19 NGC 7140 G 21 52 15.352 -55 34 10.79   12.68 13.49 11.63 12.0 ~ 73 0
20 IC 1438 EmG 22 16 29.106 -21 25 50.62   12.63   11.57   ~ 76 0
21 NGC 7552 GiP 23 16 10.767 -42 35 05.39 11.34 11.22 10.57 10.08 11.1 ~ 516 3
22 NGC 7755 EmG 23 47 51.7426503124 -30 31 19.174521238   12.10 11.36 11.11 11.7 ~ 114 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-11:38:21

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