Abstract
We explore the nature of the faint blue objects in the Hubble Deep Field–South. We have derived proper motions for the point sources in the Hubble Deep Field–South using a 3 yr baseline. Combining our proper-motion measurements with spectral energy distribution fitting enabled us to identify four quasars and 42 stars, including three white dwarf candidates. Two of these white dwarf candidates, HDF-S 1444 and 895, are found to display significant proper motion, 21:1±7:9 and 34:9 ± 8:0 mas yr - 1 , and are consistent with being thick-disk or halo white dwarfs located at ̴2 kpc. The other faint blue objects analyzed by Mendez & Minniti do not show any significant proper motion and are inconsistent with being halo white dwarfs; they do not contribute to the Galactic dark matter. The observed population of stars and white dwarfs is consistent with standard Galactic models.
| Original language | American English |
|---|---|
| Journal | The Astrophysical Journal |
| Volume | 633 |
| State | Published - Nov 10 2005 |
| Externally published | Yes |
Keywords
- dark matter
- Galaxy: halo
- stars: evolution
- white dwarfs
Disciplines
- Stars, Interstellar Medium and the Galaxy