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 observations at 3.6, 4.5, 5.8, 8, 24, 70 & 160um of NGC 205, thedwarf elliptical companion of M31, obtained with the Spitzer Space Telescope.The point sources subtracted images at 8 and 24um display a complex andfragmented infrared emission coming from both very small dust particles andlarger grains. The extended dust emission is spatially concentrated in threemain emission regions, seen at all wavelengths from 8 to 160um. These regionslie approximately along NGC 205's semi-major axis and range from ~100 to 300 pcin size. Based on our mid-to-far infrared flux density measurements alone, wederive a total dust mass estimate of the order of 3.2e4 solar masses, mainly ata temperature of ~20K. The gas mass associated with this component matches thepredicted mass returned by the dying stars from the last burst of starformation in NGC 205 (~0.5 Gyr ago). Analysis of the Spitzer data combined withprevious 1.1mm observations over a small central region or "Core'' (18"diameter), suggest the presence of very cold (~12K) dust and a dust mass aboutsixteen times higher than is estimated from the Spitzer measurements alone.Assuming a gas to dust mass ratio of 100, these two datasets, i.e.with andwithout the millimeter observations, suggest a total gas mass range of 3.2e6 to5e7 solar masses.Comment: PDF, 10 pages, simulated ApJ, accepted for publicatio

Mapping and Mass Measurement of the Cold Dust in NGC 205 withSpitzer