SDSS-IV MaNGA: spatially resolved star formation in barred galaxies

Amelia Fraser-McKelvie, Alfonso Aragón-Salamanca, Michael Merrifield, Karen Masters, Preethi Nair, Eric Emsellem, Katarina Kraljic, Dhanesh Krishnarao, Brett H. Andrews, Niv Drory, Justus Neumann

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Abstract

Bars inhabit the majority of local-Universe disk galaxies and may be important drivers of galaxy evolution through the redistribution of gas and angular momentum within disks. We investigate the star formation and gas properties of bars in galaxies spanning a wide range of masses, environments, and star formation rates using the MaNGA galaxy survey. Using a robustly-defined sample of 684 barred galaxies, we find that fractional (or scaled) bar length correlates with the host's offset from the star-formation main sequence. Considering the morphology of the Hα emission we separate barred galaxies into different categories, including barred, ringed, and central configurations, together with Hα detected at the ends of a bar. We find that only low-mass galaxies host star formation along their bars, and that this is located predominantly at the leading edge of the bar itself. Our results are supported by recent simulations of massive galaxies, which show that the position of star formation within a bar is regulated by a combination of shear forces, turbulence and gas flows. We conclude that the physical properties of a bar are mostly governed by the existing stellar mass of the host galaxy, but that they also play an important role in the galaxy's ongoing star formation.
Original languageEnglish
Pages (from-to)4158-4169
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume495
Issue number4
Early online date22 May 2020
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • astro-ph.GA
  • galaxies: evolution
  • galaxies: general
  • galaxies: star formation
  • galaxies: spiral

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