English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present detections of the CO(J= 1-0) emission line in a sample of fourmassive star-forming galaxies at z~1.5-2.2 obtained with the Karl G. JanskyVery Large Array (VLA). Combining these observations with previous CO(2-1) andCO(3-2) detections of these galaxies, we study the excitation properties of themolecular gas in our sample sources. We find an average line brightnesstemperature ratios of R_{21}=0.70+\-0.16 and R_{31}=0.50+\-0.29, based onmeasurements for three and two galaxies, respectively. These results provideadditional support to previous indications of sub-thermal gas excitation forthe CO(3-2) line with a typically assumed line ratio R_{31}~0.5. For one of ourtargets, BzK-21000, we present spatially resolved CO line maps. At theresolution of 0.18 arcsec (1.5 kpc), most of the emission is resolved outexcept for some clumpy structure. From this, we attempt to identify moleculargas clumps in the data cube, finding 4 possible candidates. We estimate that<40 % of the molecular gas is confined to giant clumps (~1.5 kpc in size), andthus most of the gas could be distributed in small fainter clouds or in fairlydiffuse extended regions of lower brightness temperatures than our sensitivitylimit.

CO(1-0) line imaging of massive star-forming disc galaxies at z=1.5-2.2