Proper Motion Objects in the Hubble Deep Field

Details Proper Motion Objects in the Hubble Deep Field Proper Motion Objects in the Hubble Deep Field

2004-03-26

arxiv.org/abs/astro-ph/0403611v1

Astrophys.J. 609 (2004) 766-775

Astronomy and Astrophysics

Astrophysics

27 pages, 7 figures, Accepted for publication in ApJ

Scientific paper

10.1086/421343

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 motion, 10.0 $\pm$ 2.5 and 15.5 $\pm$ 3.8 mas yr$^{-1}$. Photometric distances and tangential velocities for these stars are consistent with disk white dwarfs located at $\sim$ 500 pc. 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.

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