SDSS-IV MaNGA: Stellar Population Gradients Within Barred Galaxies

Abstract

Bars in galaxies are thought to stimulate both inflow of material and radial mixing along them. Observational evidence for this mixing has been inconclusive so far however, limiting the evaluation of the impact of bars on galaxy evolution. We now use results from the MaNGA integral field spectroscopic survey to characterise radial stellar age and metallicity gradients along the bar and outside the bar in 128 strongly barred galaxies. We find that age and metallicity gradients are flatter in the barred regions of almost all barred galaxies when compared to corresponding disk regions at the same radii. Our results re-emphasize the key fact that by azimuthally averaging integral field spectroscopic data one loses important information from non-axisymmetric galaxy components such as bars and spiral arms. We interpret our results as observational evidence that bars are radially mixing material in galaxies of all stellar masses, and for all bar morphologies and evolutionary stages.

6 pages, 2 figures, accepted for publication in MNRAS Letters

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Cited by in corpus (15)

• Exploring the stellar age distribution of the Milky Way Bulge using APOGEE
• Resolved stellar population properties of PHANGS-MUSE galaxies
• The VMC survey -- XLIV: Mapping metallicity trends in the Large Magellanic Cloud using near-infrared passbands
• SDSS-IV MaNGA: Bar pattern speed estimates with the Tremaine-Weinberg method and their error sources
• Milky Way Analogues in MaNGA: Multi-Parameter Homogeneity and Comparison to the Milky Way
• Metallicity Gradient of Barred Galaxies with TYPHOON
• Galaxy Zoo: 3D -- Crowd-sourced Bar, Spiral and Foreground Star Masks for MaNGA Target Galaxies
• The VMC survey -- XXXIX: Mapping metallicity trends in the Small Magellanic Cloud using near-infrared passbands
• Exploring stellar and ionized gas non--circular motions in barred galaxies with MUSE
• Galaxies within galaxies in the TIMER survey: stellar populations of inner bars are scaled replicas of main bars
• The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs
• Photometric Signature of Ultra-Harmonic Resonances in Barred Galaxies
• Bar rejuvenation in S0 galaxies?
• Size, shade or shape? The contribution of galaxies of different types to the star-formation history of the Universe from SDSS-IV MaNGA
• Local variations of the Stellar Velocity Ellipsoid-II: the effect of the bar in the inner regions of Auriga galaxies