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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The next generation Very Large Array (ngVLA) will revolutionize ourunderstanding of the distant Universe via the detection of cold molecular gasin the first galaxies. Its impact on studies of galaxy characterization viadetailed gas dynamics will provide crucial insight on dominant physical driversfor star-formation in high redshift galaxies, including the exchange of gasfrom scales of the circumgalactic medium down to resolved clouds on mass scalesof $\sim10^{5}\,M_\odot$. In this study, we employ a series of high-resolution,cosmological, hydrodynamic zoom simulations from the MUFASA simulation suiteand a CASA simulator to generate mock ngVLA observations of a $z\sim4.5$ gasrich star-forming galaxy. Using the DESPOTIC radiative transfer code thatencompasses simultaneous thermal, chemical, and statistical equilibrium incalculating the molecular and atomic level transitions of CO from ALMA forcomparison. We find that observations of CO(1-0) are especially important fortracing the systemic redshift of the galaxy and the total mass of thewell-shielded molecular gas reservoir, while even CO(2-1) can predominantlytrace denser gas regions distinct from CO(1-0). The factor of 100 timesimprovement in mapping speed for the ngVLA beyond the Jansky VLA and theproposed ALMA Band 1 will make these detailed, high-resolution imaging andkinematic studies of CO(1-0) routine at $z\sim2-5$.

Science with an ngVLA: Imaging Cold Gas to 1 kpc Scales in High-Redshift Galaxies with the ngVLA