Galaxy Zoo: The dependence of the star formation-stellar mass relation on spiral disc morphology

Kyle W. Willett, Kevin Schawinski, Brooke D. Simmons, Karen L. Masters, Ramin A. Skibba, Sugata Kaviraj, Thomas Melvin, O. Ivy Wong, Robert C. Nichol, Edmond Cheung, Chris J. Lintott, Lucy Fortson

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We measure the stellar mass-star formation rate (SFR) relation in star-forming disc galaxies at z ≤ 0.085, using Galaxy Zoo morphologies to examine different populations of spirals as classified by their kiloparsec-scale structure. We examine the number of spiral arms, their relative pitch angle, and the presence of a galactic bar in the disc, and show that both the slope and dispersion of the M*-SFR relation is constant when varying all the above parameters. We also show that mergers (both major and minor), which represent the strongest conditions for increases in star formation at a constant mass, only boost the SFR above the main relation by ~0.3 dex; this is significantly smaller than the increase seen in merging systems at z > 1. Of the galaxies lying significantly above the M*-SFR relation in the local Universe, more than 50 per cent are mergers.We interpret this as evidence that the spiral arms, which are imperfect reflections of the galaxy's current gravitational potential, are either fully independent of the various quenching mechanisms or are completely overwhelmed by the combination of outflows and feedback. The arrangement of the star formation can be changed, but the system as a whole regulates itself even in the presence of strong dynamical forcing.

Original languageEnglish (US)
Pages (from-to)820-827
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume449
Issue number1
DOIs
StatePublished - Feb 23 2015

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zoo
star formation rate
stellar mass
star formation
galaxies
M stars
merger
disk galaxies
pitch (inclination)
acceleration (physics)
gravitational fields
outflow
universe
quenching
slopes
stars
rate

Keywords

  • Galaxies: spiral
  • Galaxies: star formation

Cite this

Galaxy Zoo : The dependence of the star formation-stellar mass relation on spiral disc morphology. / Willett, Kyle W.; Schawinski, Kevin; Simmons, Brooke D.; Masters, Karen L.; Skibba, Ramin A.; Kaviraj, Sugata; Melvin, Thomas; Ivy Wong, O.; Nichol, Robert C.; Cheung, Edmond; Lintott, Chris J.; Fortson, Lucy.

In: Monthly Notices of the Royal Astronomical Society, Vol. 449, No. 1, 23.02.2015, p. 820-827.

Research output: Contribution to journalArticle

Willett, KW, Schawinski, K, Simmons, BD, Masters, KL, Skibba, RA, Kaviraj, S, Melvin, T, Ivy Wong, O, Nichol, RC, Cheung, E, Lintott, CJ & Fortson, L 2015, 'Galaxy Zoo: The dependence of the star formation-stellar mass relation on spiral disc morphology', Monthly Notices of the Royal Astronomical Society, vol. 449, no. 1, pp. 820-827. https://doi.org/10.1093/mnras/stv307
Willett, Kyle W. ; Schawinski, Kevin ; Simmons, Brooke D. ; Masters, Karen L. ; Skibba, Ramin A. ; Kaviraj, Sugata ; Melvin, Thomas ; Ivy Wong, O. ; Nichol, Robert C. ; Cheung, Edmond ; Lintott, Chris J. ; Fortson, Lucy. / Galaxy Zoo : The dependence of the star formation-stellar mass relation on spiral disc morphology. In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 449, No. 1. pp. 820-827.
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