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 new low-resolution HI spectral line imaging, obtained with theKarl G. Jansky Very Large Array (JVLA), of the star-forming Magellanicirregular galaxy UGCA 105. This nearby (D = 3.39+/-0.25 Mpc), low mass[M_HI=(4.3+/-0.5)x10^8 Solar masses] system harbors a large neutral gas disk(HI radius ~7.2 kpc at the N_HI=10^20 cm^-2 level) that is roughly twice aslarge as the stellar disk at the B-band R_25 isophote. We explore the neutralgas dynamics of this system, fitting tilted ring models in order to extract awell-sampled rotation curve. The rotation velocity rises in the inner disk,flattens at 72+/-3 km/s, and remains flat to the last measured point of thedisk (~7.5 kpc). The dynamical mass of UGCA 105 at this outermost point,(9+/-2)x10^9 Solar masses, is ~10 times as large as the luminous baryoniccomponents (neutral atomic gas and stars). The proximity and favorableinclination (55 degrees) of UGCA 105 make it a promising target forhigh-resolution studies of both star formation and rotational dynamics in anearby low-mass galaxy.

The Neutral Gas Dynamics of the Nearby Magellanic Irregular Galaxy UGCA 105