2019A&A...632A..51C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.10CEST02:38:46

2019A&A...632A..51C - Astronomy and Astrophysics, volume 632A, 51-51 (2019/12-0)

Bar pattern speeds in CALIFA galaxies. II. The case of weakly barred galaxies.

CUOMO V., LOPEZ AGUERRI J.A., CORSINI E.M., DEBATTISTA V.P., MENDEZ-ABREU J. and PIZZELLA A.

Abstract (from CDS):


Context. About 35% of the nearby disc galaxies host a weak bar for which different formation scenarios, including the weakening of a strong bar and tidal interaction with a companion, have been suggested. Measuring the bar pattern speeds of a sample of weakly barred galaxies is a key step in constraining their formation process, but such a systematic investigation is still missing.
Aims. We investigated the formation process of weak bars by measuring their properties in a sample of 29 nearby weakly barred galaxies, spanning a wide range of morphological types and luminosities. The sample galaxies were selected to have an intermediate inclination, a bar at an intermediate angle between the disc minor and major axes, and an undisturbed morphology and kinematics to allow the direct measurement of the bar pattern speed. Combining our analysis with previous studies, we compared the properties of weak and strong bars.
Methods. We measured the bar radius and strength from the r band images available in the Sloan Digital Sky Survey and bar pattern speed and corotation radius from the stellar kinematics obtained by the Calar Alto Legacy Integral Field Area Survey. We derived the bar rotation rate as the ratio between the corotation and bar radii.
Results. Thirteen out of 29 galaxies (45%), which were morphologically classified as weakly barred from a visual inspection, do not actually host a bar component or their central elongated component is not in rigid rotation. We successfully derived the bar pattern speed in 16 objects. Two of them host an ultrafast bar. Using the bar strength to differentiate between weak and strong bars, we found that the weakly barred galaxies host shorter bars with smaller corotation radii than their strongly barred counterparts. Weak and strong bars have similar bar pattern speeds and rotation rates, which are all consistent with being fast. We did not observe any difference between the bulge prominence in weakly and strongly barred galaxies, whereas nearly all the weak bars reside in the disc inner parts, contrary to strong bars.
Conclusions. We ruled out that the bar weakening is only related to the bulge prominence and that the formation of weak bars is triggered by the tidal interaction with a companion. Our observational results suggest that weak bars may be evolved systems exchanging less angular momentum with other galactic components than strong bars.

Abstract Copyright: © ESO 2019

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

Simbad objects: 30

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Number of rows : 30

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 IC 1528 EmG 00 05 05.365 -07 05 36.32   13.5   13.5 13.2 ~ 44 0
2 UGC 36 G 00 05 13.8793403191 +06 46 19.205724170   14.7       ~ 53 0
3 MCG-02-02-030 LIN 00 30 07.308 -11 06 49.19   13   12.65   ~ 48 0
4 NGC 192 rG 00 39 13.391 +00 51 50.89   13.9   11.97   ~ 111 0
5 NGC 234 EmG 00 43 32.3816212175 +14 20 33.389672451   13.5       ~ 103 0
6 NGC 364 LIN 01 04 40.875 -00 48 09.58   14.6       ~ 51 0
7 NGC 477 Sy2 01 21 20.3413342481 +40 29 17.410487515   14.0       ~ 84 0
8 IC 1683 GiG 01 22 38.867 +34 26 13.21   14.2       ~ 70 0
9 NGC 551 G 01 27 40.6317165588 +37 10 58.787535302   13.5       ~ 66 0
10 NGC 2410 AGN 07 35 02.258 +32 49 19.77   17.01 16.26     ~ 69 0
11 UGC 3944 EmG 07 38 36.517 +37 38 00.24   14.481 13.889 13.424 12.761 ~ 68 0
12 NGC 2449 LIN 07 47 20.2949490006 +26 55 48.591065899   14.3       ~ 53 0
13 NGC 2553 GiG 08 17 35.035 +20 54 11.62   15.0       ~ 40 0
14 NGC 2880 GiG 09 29 34.618 +62 29 26.23   12.6       ~ 137 0
15 NGC 3994 LIN 11 57 36.866 +32 16 39.45   13.51 12.87     ~ 166 1
16 UGC 7012 rG 12 02 03.164 +29 50 53.11   14.3       ~ 83 0
17 UGC 8231 LSB 13 08 37.262 +54 04 28.02   14.2       ~ 43 0
18 NGC 5056 G 13 16 12.329 +30 57 01.08   13.6       ~ 116 0
19 NVSS J141045+151231 rG 14 10 45.462 +15 12 33.91   14.7       ~ 55 0
20 NGC 5971 LIN 15 35 36.9045223890 +56 27 42.112723622   14.9       ~ 33 0
21 IC 1199 G 16 10 34.347 +10 02 25.50   14.6       ~ 45 0
22 NGC 6278 GiP 17 00 50.3235661456 +23 00 39.759687248   13.8       ~ 132 0
23 UGC 10693 GiG 17 04 52.969 +41 51 55.75   14.2       ~ 33 0
24 UGC 10796 Sy1 17 16 47.644 +61 55 12.41   14.50       ~ 45 1
25 IC 1256 G 17 23 47.322 +26 29 11.45   14.297 13.551 13.022 12.434 ~ 81 0
26 ESO 139-9 G 17 36 05.8972065299 -61 53 54.702144199   14.44   13.25   ~ 21 0
27 NGC 6427 GiP 17 43 38.5945388710 +25 29 38.142842609   14.6       ~ 31 0
28 NGC 6978 LIN 20 52 35.4344586778 -05 42 40.042984053   14.22   12.67   ~ 72 0
29 IC 5309 GiG 23 19 11.638 +08 06 33.58   15.0       ~ 101 0
30 NGC 7787 G 23 56 07.8144504159 +00 32 57.942454392   15.7       ~ 50 0

    Equat.    Gal    SGal    Ecl

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2020.08.10-02:38:46

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