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

Spectra that cover wavelengths from 0.6 to 1.1um are used to examine thebehavior of emission and absorption features in a contiguous 22 x 300 arcsecregion centered on the nearby dwarf galaxy NGC 55. Based on the relativestrengths of various emission features measured over spatial scales of manytens of parsecs, it is concluded that the ionization states and sulphurabundances in most of the star-forming regions near the center of NGC 55 aresimilar. A large star-forming region is identified in the north west part ofthe disk at a projected distance of ~1 kpc from the galaxy center that hasdistinct ionization properties. Fossil star-forming regions are also identifiedusing the depth of the near-infrared Ca triplet. One such area is identifiednear the intersection of the major and minor axes, and it is suggested thatthis area is a proto-nucleus. The spectra of bright unresolved sources that areblended stellar asterisms, compact HII regions, and star clusters are alsodiscussed. The spectra of some of the HII regions contain Ca triplet absorptionlines, signalling a concentration of stars in the resolution element that spanmany Myr. Six of the unresolved sources have spectroscopic characteristics thatare indicative of C stars embedded in intermediate age clusters. The peculiarproperties of NGC 55 have been well documented in the literature, and it isargued that these may indicate that NGC 55 is transforming into a dwarflenticular galaxy.

Changes: The Past, Present, and Future of the Nearby Dwarf Galaxy NGC 55