SIMBAD references

2017ApJ...846L..22G - Astrophys. J., 846, L22-L22 (2017/September-2)

ALMA resolves the molecular gas in a young low-metallicity starburst galaxy at z = 1.7.

GONZALEZ-LOPEZ J., BARRIENTOS L.F., GLADDERS M.D., WUYTS E., RIGBY J., SHARON K., ARAVENA M., BAYLISS M.B. and IBAR E.

Abstract (from CDS):

We present Atacama Large Millimeter/submillimeter Array observations of CO lines and dust continuum emission of the source RCSGA 032727-132609, a young z = 1.7 low-metallicity starburst galaxy. The CO(3-2) and CO(6-5) lines and continuum at rest-frame 450 µm are detected and show a resolved structure in the image plane. We use the corresponding lensing model to obtain a source plane reconstruction of the detected emissions revealing an intrinsic flux density of S_450µm=23.5-8.1_+26.8µJy and intrinsic CO luminosities LCO(3–2)^′=2.90-0.23_+0.21 ×108 K km s–1 pc2 and LCO(6–5)^′=8.0-1.3_+1.4×107 K km s–1 pc2. We used the resolved properties in the source plane to obtain molecular gas and star formation rate surface densities of ΣH2=16.2–3.5+5.8 M pc–2 and ΣSFR=0.54–0.27+0.89 M yr–1 kpc–2, respectively. The intrinsic properties of RCSGA 032727-132609 show an enhanced star formation activity compared to local spiral galaxies with similar molecular gas densities, supporting the ongoing merger-starburst phase scenario. RCSGA 032727-132609 also appears to be a low-density starburst galaxy similar to local blue compact dwarf galaxies, which have been suggested as local analogs to high-redshift low-metallicity starburst systems. Finally, the CO excitation level in the galaxy is consistent with having the peak at J∼5, with a higher excitation concentrated in the star-forming clumps.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: RCSGA 032727-132609 - gravitational lensing: strong - submillimeter: ISM - submillimeter: ISM

Simbad objects: 4

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2021.11.28-22:47:47

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