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

We analyze the relationships between atomic, neutral hydrogen (HI) and starformation (SF) in the 12 low-mass SHIELD galaxies. We compare high spectral(~0.82 km/s/channel) and spatial resolution (physical resolutions of 170 pc -700 pc) HI imaging from the VLA with H\alpha and far-ultraviolet imaging. Wequantify the degree of co-spatiality between star forming regions and regionsof high HI column densities. We calculate the global star formationefficiencies (SFE, $\Sigma_{\rm SFR}$ / $\Sigma_{\rm HI}$), and examine therelationships among the SFE and HI mass, HI column density, and star formationrate (SFR). The systems are consuming their cold neutral gas on timescales oforder a few Gyr. While we derive an index for the Kennicutt-Schmidt relation ofN ~ 0.68 $\pm$ 0.04 for the SHIELD sample as a whole, the values of N varyconsiderably from system to system. By supplementing SHIELD results with thosefrom other surveys, we find that HI mass and UV-based SFR are stronglycorrelated over five orders of magnitude. Identification of patterns within theSHIELD sample allows us to bin the galaxies into three general categories: 1)mainly co-spatial HI and SF regions, found in systems with highest peak HIcolumn densities and highest total HI masses, 2) moderately correlated HI andSF regions, found in systems with moderate HI column densities, and 3) obviousoffsets between HI and SF peaks, found in systems with the lowest total HImasses. SF in these galaxies is dominated by stochasticity and randomfluctuations in their ISM.

SHIELD: Comparing Gas and Star Formation in Low Mass Galaxies