A V-Band Survey for Variable Galactic Nuclei in the Hubble Deep Field

Details A V-Band Survey for Variable Galactic Nuclei in the Hubble Deep Field A V-Band Survey for Variable Galactic Nuclei in the Hubble Deep Field

2003-08-21

arxiv.org/abs/astro-ph/0308383v1

Astrophys.J.599:173-184,2003

Astronomy and Astrophysics

Astrophysics

33 pages, 9 figures, to be published in Dec. 2003 ApJ

Scientific paper

10.1086/379168

We present the results of a 2-epoch variability survey in the Hubble Deep Field with the goal of investigating the population of AGN to z=1. The primary data sets analyzed for galactic variability are the original HDF observations obtained in 1995 and a second V-band image obtained 5 years later in 2000. We find evidence for nuclear variability in 16 of 217 galaxies brighter than V_nuc=27.5. Correcting for incompleteness and spurious detections, variable nuclei make up ~8% of the surveyed galaxies. Seven of our variable sources are coincident with X-ray sources detected in the 2Ms Chandra survey. We find that 44% of the variable nuclei are associated with mid-IR detections at 15 microns and 31% are detected at 1.4GHz. Optical spectra are available for 13 of the 16 variables. One is a broad-line AGN and 2 others show weak evidence of type 2 AGNs. With the assumption that these variables are all active nuclei, we estimate the AGN LF at 0.4

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