Resolved Molecular Gas and Star Formation Properties of the Strongly Lensed z = 2.26 Galaxy SDSS J0901+1814

Chelsea E. Sharon, Amitpal S. Tagore, Andrew J. Baker, Jesus Rivera, Charles R. Keeton, Dieter Lutz, Reinhard Genzel, David J. Wilner, Erin K.S. Hicks, Sahar S. Allam, Douglas L. Tucker

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We present ∼1″ resolution (∼2 kpc in the source plane) observations of the CO (1-0), CO (3-2), Hα, and [N ii] lines in the strongly lensed z = 2.26 star-forming galaxy SDSS J0901+1814. We use these observations to constrain the lensing potential of a foreground group of galaxies, and our source-plane reconstructions indicate that SDSS J0901+1814 is a nearly face-on (i ≈ 30°) massive disk with r 1/2 4 kpc for its molecular gas. Using our new magnification factors (μ tot ≈ 30), we find that SDSS J0901+1814 has a star formation rate (SFR) of , , and , which places it on the star-forming galaxy "main sequence." We use our matched high angular resolution gas and SFR tracers (CO and Hα, respectively) to perform a spatially resolved (pixel-by-pixel) analysis of SDSS J0901+1814 in terms of the Schmidt-Kennicutt relation. After correcting for the large fraction of obscured star formation (), we find that SDSS J0901+1814 is offset from "normal" star-forming galaxies to higher star formation efficiencies independent of assumptions for the CO-To-H2 conversion factor. Our mean best-fit index for the Schmidt-Kennicutt relation for SDSS J0901+1814, evaluated with different CO lines and smoothing levels, is however, the index may be affected by gravitational lensing, and we find when analyzing the source-plane reconstructions. While the Schmidt-Kennicutt index largely appears unaffected by which of the two CO transitions we use to trace the molecular gas, the source-plane reconstructions and dynamical modeling suggest that the CO (1-0) emission is more spatially extended than the CO (3-2) emission.

Original languageEnglish (US)
Article number52
JournalAstrophysical Journal
Issue number1
StatePublished - Jul 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • ISM: molecules
  • galaxies: ISM
  • galaxies: high-redshift
  • galaxies: individual (SDSS J0901+1814)
  • galaxies: star formation
  • galaxies: starburst


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