Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-14
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures, accepted for publication in Astrophysical Journal, minor changes to references
Scientific paper
10.1086/499577
We present a photometric search for objects with point-source components that are optically variable on timescales of weeks--months in the Hubble Ultra Deep Field (HUDF) to i'(AB)=28.0 mag. The data are split into four sub-stacks of approximately equal exposure times. Objects exhibiting the signature of optical variability are selected by studying the photometric error distribution between the four different epochs, and selecting 622 candidates as 3.0 sigma outliers from the original catalog of 4644 objects. Of these, 45 are visually confirmed as free of contamination from close neighbors or various types of image defects. Four lie within the positional error boxes of Chandra X-ray sources, and two of these are spectroscopically confirmed AGN. The photometric redshift distribution of the selected variable sample is compared to that of field galaxies, and we find that a constant fraction of ~1% of all field objects show variability over the range of 0.1
Cohen Seth H.
Hathi Nimish P.
Koekemoer Anton M.
Malhotra Sagar
Mobasher Bahram
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