Distinct stellar populations in the inner bars of double-barred galaxies

  title={Distinct stellar populations in the inner bars of double-barred galaxies},
  author={Adriana de Lorenzo-C'aceres and Jes'us Falc'on-Barroso and Alejandro Vazdekis},
  journal={Monthly Notices of the Royal Astronomical Society},
Numerical simulations of double-barred galaxies predict the build-up of different structural components (e.g. bulges, inner discs) in the central regions of disc galaxies. In those simulations, inner bars have a prominent role in the internal secular evolution of their host galaxies. The development of bulges and inner discs is, however, poorly understood observationally due to the small number of studies focusing on the stellar populations of these systems. In order to provide constraints on… 
Galaxies within galaxies in the TIMER survey: stellar populations of inner bars are scaled replicas of main bars
Inner bars are frequent structures in the local Universe and thought to substantially influence the nuclear regions of disc galaxies. In this study we explore the structure and dynamics of inner bars
Clocking the assembly of double-barred galaxies with the MUSE TIMER project
The formation of two stellar bars within a galaxy has proved challenging for numerical studies. It is not yet clear whether the inner bar is born via a star formation process promoted by gas inflow
Forming Double-Barred Galaxies from Dynamically Cool Inner Disks
About one-third of early-type barred galaxies host small-scale secondary bars. The formation and evolution of such double-barred (S2B) galaxies remain far from being well understood. In order to
Stellar populations across galaxy bars in the MUSE TIMER project
Stellar populations in barred galaxies save an imprint of the influence of the bar on the host galaxy’s evolution. We present a detailed analysis of star formation histories (SFHs) and chemical
Using high-resolution N-body simulations, we recently reported that a dynamically cool inner disk embedded in a hotter outer disk can naturally generate a steady double-barred (S2B) structure. Here
The BaLROG project - II. Quantifying the influence of bars on the stellar populations of nearby galaxies
We continue the exploration of the BaLROG (Bars in Low Redshift Optical Galaxies) sample: 16 large mosaics of barred galaxies observed with the integral field unit Spectrographic Areal Unit for
Kinematic signatures of nuclear discs and bar-driven secular evolution in nearby galaxies of the MUSE TIMER project
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
The long-lived inner bar of NGC 1291
Abstract The question whether stellar bars are either transitory features or long-lived structures is still matter of debate. This problem is more acute for double-barred systems where even the
Distribution of star formation in galactic bars as seen with Hα and stacked GALEX UV imaging
Context. Stellar bars are known to gradually funnel gas to the central parts of disk galaxies. It remains a matter of debate why the distribution of ionized gas along bars and in the circumnuclear
Evidence of bar-induced secular evolution in the inner regions of stellar discs in galaxies: what shapes disc galaxies?
We present evidence of bar-induced secular evolution in galactic discs using 3.6 mu m images of nearby galaxies from the Spitzer Survey of Stellar Structure in Galaxies (S(4)G). We find that among


Constraining the formation of inner bars: photometry, kinematics and stellar populations in NGC 357†
Double-barred galaxies are common in the local Universe, with approximately one-third of barred spirals hosting a smaller, inner bar. Nested bars have been proposed as a mechanism to transport gas to
Double-Barred Galaxies I. A Catalog of Barred Galaxies with Stellar Secondary Bars and Inner Disks
I present a catalog of 67 barred galaxies which contain distinct, elliptical stellar structures inside their bars. Fifty of these are double-barred galaxies: a small-scale, inner or secondary bar is
Study of stellar populations in the bulges of barred galaxies
Aims. To determine the influence of bars in the building of galaxy bu lges through the analysis of ages and metallicities derived from stellar absorption line-strength indices. Methods. Long-slit
Star formation history of barred disc galaxies
We present the first results of a pilot study aimed at understanding the influence of bars on the evolution of galaxy discs through the study of their stellar content. We examine here the kinematics,
Stellar populations in bulges of spiral galaxies
We present line strengths in the bulges and inner discs of 38 galaxies in the local Universe, including several galaxies whose bulges were previously identified as being disc like in their colours or
Double Bars, Inner Disks, and Nuclear Rings in Early-Type Disk Galaxies
We present results from a survey of an unbiased sample of 38 early-type (S0–Sa), low-inclination, optically barred galaxies in the field, using images both from the ground and from space. Our goal
Nested Bars in Disk Galaxies: No Offset Dust Lanes in Secondary Nuclear Bars
Under certain conditions, subkiloparsec nuclear bars form inside large-scale stellar bars of disk galaxies. These secondary bars spend a fraction of their lifetime in a dynamically decoupled state,
Double Bars in Disk Galaxies: Dynamical Decoupling of Non-Self-gravitating Gaseous Bars
We find that nuclear rings in barred galaxies can be subject to a new type of non-self-gravitational dynamical instability. The instability leads to the formation of gaseous molecular bars with
A minor merger origin for stellar inner discs and rings in spiral galaxies
Context. Observations have shown that inner discs and rings (IDs and IRs) are not preferably found in barred galaxies, which indicates that their formation may differ from that described by the
Stellar population gradients in bulges along the Hubble sequence - II. Relations with galaxy properties
We present the analysis of the radial gradients of stellar absorption lines in a sample of 32 bulges of edge-on spiral galaxies, spanning nearly the full Hubble sequence (from S0 to Sc types), and a