SIMBAD references

2019ApJ...879...52S - Astrophys. J., 879, 52-52 (2019/July-1)

Resolved molecular gas and star formation properties of the strongly lensed z = 2.26 galaxy SDSS J0901+1814.

SHARON C.E., TAGORE A.S., BAKER A.J., RIVERA J., KEETON C.R., LUTZ D., GENZEL R., WILNER D.J., HICKS E.K.S., ALLAM S.S. and TUCKER D.L.

Abstract (from CDS):

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 r1/2 >= 4 kpc for its molecular gas. Using our new magnification factors (µtot ≃ 30), we find that SDSS J0901+1814 has a star formation rate (SFR) of 268–61+63Myr–1, Mgas=(1.6–0.2+0.3)×1011CO/4.6)M, and M*=(9.5–2.8+3.8)×1010M, 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 (SFR/SFRTIR=0.054–0.014+0.015), 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 {bar}n=1.54±0.13; however, the index may be affected by gravitational lensing, and we find {bar}n=1.24±0.02 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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

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

Simbad objects: 14

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2019.10.19-05:22:00

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