CHANG-ES XXV: H I imaging of nearby edge-on galaxies - Data Release 4

We present the H I distribution of galaxies from the Continuum Haloes in Nearby Galaxies - an EVLA Survey (CHANG-ES). 'Though the observational mode was not optimized for detecting H I, we successfully produce H I cubes for 19 galaxies. The moment-0 maps from this work are available on CHANG-ES data release website (i.e. https://www.queensu.ca/changes) . Our sample is dominated by star-forming, H I-rich galaxies at distances from 6.27 to 34.1 Mpc. H I interferometric images on two of these galaxies (NGC 5792 and UGC 10288) are presented here for the first time, while 12 of our remaining sample galaxies now have better H I spatial resolutions and/or sensitivities of intensity maps than those in existing publications. We characterize the average scale heights of the H I distributions for a subset of most inclined galaxies (inclination > 80 deg), and compare them to the radio continuum intensity scale heights, which have been derived in a similar way. The two types of scale heights are well correlated, with similar dependence on disc radial extension and star formation rate surface density but different dependence on mass surface density. This result indicates that the vertical distribution of the two components may be governed by similar fundamental physics but with subtle differences.

Automated summary

This study presents the H I distribution of 19 galaxies, with the H I interferometric images of two galaxies being shown for the first time and 12 galaxies having better H I spatial resolutions and/or sensitivities than existing publications. The study finds a correlation between the vertical distribution of H I and the radio continuum intensity scale heights but with differences in the dependence on mass surface density.