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

While bright, blue, compact galaxies are common at $\rm z \sim 1$, they arerelatively rare in the local universe, and their evolutionary paths areuncertain. We have obtained resolved H I observations of nine $\rm z \sim 0$luminous compact blue galaxies (LCBGs) using the Giant Metrewave RadioTelescope and Very Large Array in order to measure their kinematic anddynamical properties and better constrain their evolutionary possibilities. Wefind that the LCBGs in our sample are rotating galaxies that tend to havenearby companions, relatively high central velocity dispersions, and can havedisturbed velocity fields. We calculate rotation velocities for each galaxy bymeasuring half of the velocity gradient along their major axes and correctingfor inclination using axis ratios derived from SDSS images of each galaxy. Wecompare our measurements to those previously made with single dishes and findthat single dish measurements tend to overestimate LCBGs' rotation velocitiesand H I masses. We also compare the ratio of LCBGs' rotation velocities andvelocity dispersions to those of other types of galaxies and find that LCBGsare strongly rotationally supported at large radii, similar to other diskgalaxies, though within their half-light radii the $\rm V_{rot}/ \sigma$ valuesof their H I are comparable to stellar $\rm V_{rot}/ \sigma$ values of dwarfelliptical galaxies. We find that LCBGs' disks on average are gravitationallystable, though conditions may be conducive to local gravitational instabilitiesat the largest radii. Such instabilities could lead to the formation ofstar-forming gas clumps in the disk, resulting eventually in a small centralbulge or bar.

Resolved H I observations of local analogs to z ~ 1 luminous compact blue galaxies: evidence for rotation-supported disks