Proper Motion Objects in the Hubble Deep Field

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 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.

27 pages, 7 figures, Accepted for publication in ApJ

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Cited by in corpus (8)

• Testing LMC Microlensing Scenarios: The Discrimination Power of the SuperMACHO Microlensing Survey
• Stars in the Hubble Ultra Deep Field
• A Detailed Model Atmosphere Analysis of Cool White Dwarfs in the Sloan Digital Sky Survey
• Random Forest identification of the thin disk, thick disk and halo Gaia-DR2 white dwarf population
• The Gaia DR2 halo white dwarf population: the luminosity function, mass distribution and its star formation history
• Visitors from the Halo: 11 Gyr old White Dwarfs in the Solar Neighborhood
• Faint Blue Objects in the Hubble Deep Field South Revealed: White Dwarfs, Subdwarfs, and Quasars
• Moving Objects in the Hubble Ultra Deep Field