| |
 |
| Paper: |
Faint Blue Objects in the Hubble Deep Field North |
| Volume: |
334, 14th European Workshop on White Dwarfs |
| Page: |
21 |
| Authors: |
Kilic, M.; von Hippel, T.; Mendez, R.A.; Winget, D.E. |
| Abstract: |
Using the deepest and finest resolution images of the Universe acquired with the Hubble Space Telescope and a similar image taken 7 years later for the Great Observatories Origins Deep Survey, we have derived proper motions for the point sources in the Hubble Deep Field-North. Two faint blue objects, HDF2234 and HDF3072, are found to display significant proper motions, 10.0 ± 2.5 and 15.5 ± 3.8 mas yr−1. Photometric distances and tangential velocities for these stars are consistent with disk white dwarfs located at ≈500 pc. At least one of these two objects now appears spectroscopically to be a white dwarf (Kilic et al., in preparation). The faint blue objects analyzed by Ibata et al. (1999) and Mendez & Minniti (2000) do not show any significant proper motion; they are not halo white dwarfs and they do not contribute to the Galactic dark matter. These objects are likely to be distant AGN. |
|
|
|
|
|
