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

We explore the nature of the faint blue objects in the Hubble Deep FieldSouth. We have derived proper motions for the point sources in the Hubble DeepField South using a 3 year baseline. Combining our proper motion measurementswith spectral energy distribution fitting enabled us to identify 4 quasars and42 stars, including 3 white dwarf candidates. Two of these white dwarfcandidates, HDFS 1444 and 895, are found to display significant proper motion,21.1 $\pm$ 7.9 mas/yr and 34.9 $\pm$ 8.0 mas/yr, and are consistent with beingthick disk or halo white dwarfs located at ~2 kpc. The other faint blue objectsanalyzed by Mendez & Minniti do not show any significant proper motion and areinconsistent with being halo white dwarfs; they do not contribute to theGalactic dark matter. The observed population of stars and white dwarfs isconsistent with standard Galactic models.Comment: ApJ accepted, 39 pages, 13 figure

Faint Blue Objects in the Hubble Deep Field–South Revealed: White Dwarfs, Subdwarfs, and Quasars