Constraining the formation of inner bars: photometry, kinematics and stellar populations in NGC 357★

Lorenzo-Cáceres, A. de; Vazdekis, Alexandre; Aguerri, J. A. L.; Corsini, E. M.; Debattista, Victor P.

doi:10.1111/j.1365-2966.2011.20100.x

Cited by 38 publications

(50 citation statements)

References 80 publications

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“…This is in agreement with the findings of Sánchez-Blázquez et al (2011) for four different barred galaxies, although their analysis methods were quite different. Old stellar populations have also been found within bars by some studies (Pérez, Sánchez-Blázquez, & Zurita 2007;Pérez, Sánchez-Blázquez, & Zurita 2009;de Lorenzo-Cáceres et al 2012;de Lorenzo-Cáceres, Falcón-Barroso, & Vazdekis 2013), in general agreement with our results, but note that in this case it is not clear how to relate these ages to the bar age (an old population could have been assembled into a bar morphology very recently).…”

Section: Discussionsupporting

confidence: 91%

Stellar population constraints on the ages of galactic bars

James

Percival

2016

Mon. Not. R. Astron. Soc.

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We present a study of the stellar populations within the central regions of four nearby barred galaxies, and use a novel technique to constrain the duration of bar activity. We focus on the star formation 'desert', a region within each of these galaxies where star formation appears to have been suppressed by the bar. New Hβ spectroscopic data are presented, and used to produce spectroscopic line indices which are compared with theoretical predictions from population synthesis models for simple stellar populations and temporally truncated star formation histories. This analysis shows that the dearth of star formation activity in these regions appears to have been continuing for at least 1 Gyr, with timescales of several Gyr indicated for two of the galaxies. This favours models in which strong bars can be long-lived features of galaxies, but our results also indicate a significant diversity in stellar population ages, and hence in the implied histories of bar activity in these four galaxies.

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Section: Discussionsupporting

confidence: 91%

Stellar population constraints on the ages of galactic bars

James

Percival

2016

Mon. Not. R. Astron. Soc.

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“…We note that σ-hollows have been observed in other double-barred galaxies (de Lorenzo-Cáceres et al 2012Du et al 2016) and they seem, so far, an ubiquitous property of these systems. This result reinforces the validity of σ-hollows as kinematic diagnostics for identifying doublebarred galaxies.…”

Section: Stellar Kinematicssupporting

confidence: 60%

“…Within this second scenario, there are no strict constraints on the relative ages between inner and outer bars. They may both be coeval, as in the case of the double-barred galaxy NGC 357 (de Lorenzo-Cáceres et al 2012). However, younger and more metal-rich inner bars, as those observed by de Lorenzo-Cáceres et al (2013) and mentioned before, are also in agreement, depending on the amount of gas present and the timescales for star formation.…”

Section: Introductionmentioning

confidence: 99%

Clocking the assembly of double-barred galaxies with the MUSE TIMER project

Lorenzo-Cáceres

Sánchez‐Blázquez

Méndez-Abreu

et al. 2019

Monthly Notices of the Royal Astronomical Society

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The formation of two stellar bars within a galaxy has proved challenging for numerical studies. It is yet not clear whether the inner bar is born via a star formation process promoted by gas inflow along the outer bar, or whether it is dynamically assembled from instabilities in a small-scale stellar disc. Observational constraints to these scenarios are scarce. We present a thorough study of the stellar content of two double-barred galaxies observed by the MUSE TIMER project, NGC 1291 and NGC 5850, combined with a two-dimensional multi-component photometric decomposition performed on the 3.6 µm images from S 4 G. Our analysis confirms the presence of σ-hollows appearing in the stellar velocity dispersion distribution at the ends of the inner bars. Both galaxies host inner discs matching in size with the inner bars, suggestive of a dynamical formation for the inner bars from small-scale discs. The analysis of the star formation histories for the structural components shaping the galaxies provides constraints on the epoch of dynamical assembly of the inner bars, which took place >6.5 Gyr ago for NGC 1291 and >4.5 Gyr ago for NGC 5850. This implies that inner bars are long-lived structures.

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“…Wozniak 2015). All observational studies performed so far on doublebarred galaxies agree that outer bars form prior to inner bars (de Lorenzo-Cáceres et al 2012, as confirmed by their stellar populations and star formation histories. Within this scenario, large-scale bars that have developed an inner bar should be already assembled systems growing accordingly in size and strength, while inner bars could still be immersed in the process of settling up.…”

Section: Assembly Of Outer and Inner Barssupporting

confidence: 59%

Deconstructing double-barred galaxies in 2D and 3D – II. Two distinct groups of inner bars

Lorenzo-Cáceres

Méndez-Abreu

Thorne

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The intrinsic photometric properties of inner and outer stellar bars within 17 doublebarred galaxies are thoroughly studied through a photometric analysis consisting of: i) two-dimensional multi-component photometric decompositions, and ii) a threedimensional statistical deprojection for measuring the thickening of bars, thus retrieving their 3D shape. The results are compared with previous measurements obtained with the widely used analysis of integrated light. Large-scale bars in single-and doublebarred systems show similar sizes, and inner bars may be longer than outer bars in different galaxies. We find two distinct groups of inner bars attending to their in-plane length, resulting in a bimodal behaviour for the inner/outer bar length ratio. Such bimodality is not related to the properties of the host galaxy or the dominant bulge, and it does not show a counterpart in the dimension off the disc plane. The group of long inner bars lays at the bottom end of the outer bar length vs. ellipticity correlation, whereas the short inner bars are out of that relation. We suggest that this behaviour could be due to either a different nature of the inner discs from which the inner bars are dynamically formed, or a different assembly stage for the inner bars. This last possibility would imply that the dynamical assembly of inner bars is a slow process taking several Gyr to happen. Finally, we have also explored whether all large-scale bars are prone to develop an inner bar at some stage of their lives, possibility we cannot fully confirm or discard.

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Constraining the formation of inner bars: photometry, kinematics and stellar populations in NGC 357★

Cited by 38 publications

References 80 publications

Stellar population constraints on the ages of galactic bars

Stellar population constraints on the ages of galactic bars

Clocking the assembly of double-barred galaxies with the MUSE TIMER project

Deconstructing double-barred galaxies in 2D and 3D – II. Two distinct groups of inner bars

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