Comparisons between resolved star formation rate and gas tracers in the strongly lensed galaxy sdss j0901+1814 at cosmic noon

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dc.contributor.authorChen, Qingxiang
dc.contributor.authorBaker, Andrew J
dc.contributor.authorSharon, Chelsea E
dc.date.accessioned2024-11-14T07:29:03Z
dc.date.available2024-11-14T07:29:03Z
dc.date.issued2024
dc.description.abstractWe report new radio observations of SDSSJ090122.37+181432.3, a strongly lensed star-forming galaxy at z =2.26. We image 1.4GHz (L-band) and 3GHz (S-band) continuum using the Very Large Array (VLA) and 1.2 mm (band 6) continuum with Atacama Large Millimeter/submillimeter Array, in addition to the CO(7–6) and CI(3P2→3P1) lines, all at 1 TIR 2.65 0.24 7resolution. Based on the VLA integrated flux densities, we decompose the radio spectrum into its free–free (FF) and nonthermal components. The infrared–radio correlation parameter q 0.31 =+ is consistent with expectations for star-forming galaxies. We obtain radio continuum-derived star formation rates (SFRs) that are free of dust extinction, finding 620+ 280 220 280+ 460 120 M  yr 1 M  yr 1- , 230+ 570 160 M  yr 1- , and- from the FF emission, nonthermal emission, and when accounting for both emission processes, respectively, in agreement with previous results. We estimate the gas mass from the CI(3P2→3P1) line as Mgas = (1.2±0.2)×1011M☉, which is consistent with prior CO(1–0)-derived gas masses. Using our new IR and radio continuum data to map the SFR, we assess the dependence of the Schmidt–Kennicutt relation on choices of SFR and gas tracer for ∼kpc scales. The different SFR tracers yield different slopes, with the IR being the steepest, potentially due to highly obscured star formation in J0901. The radio continuum maps have the lowest slopes and overall fidelity for mapping the SFR, despite producing consistent total SFRs. We also find that the Schmidt-Kennicutt relation slope is flattest when using CO(7–6) or C I(3P2→3P1) to trace gas mass, suggesting that those transitions are not suitable for tracing the bulk molecular gas in galaxies like J0901.
dc.identifier.citationChen, Q., Sharon, C.E., Algera, H.S., Baker, A.J., Keeton, C.R., Lutz, D., Liu, D., Young, A.J., Tagore, A.S., Rivera, J. and Hicks, E.K., 2024. Comparisons between Resolved Star Formation Rate and Gas Tracers in the Strongly Lensed Galaxy SDSS J0901+ 1814 at Cosmic Noon. The Astrophysical Journal, 972(2), p.147.
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad5ceb
dc.identifier.urihttps://hdl.handle.net/10566/19664
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subjectStar formation
dc.subjectHigh-redshift galaxies
dc.subjectMolecular gases
dc.subjectRadio continuum emission
dc.subjectRadio astronomy
dc.titleComparisons between resolved star formation rate and gas tracers in the strongly lensed galaxy sdss j0901+1814 at cosmic noon
dc.typeArticle

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