AV‐Band Survey for Variable Galactic Nuclei in the Hubble Deep Field | Zendy

Vicki L. Sarajedini | Zendy; Ronald L. Gilliland | Zendy; Christina Kasm | Zendy

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AV‐Band Survey for Variable Galactic Nuclei in the Hubble Deep Field

Author(s) -

Vicki L. Sarajedini,

Ronald L. Gilliland,

Christina Kasm

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/379168

Subject(s) - physics , astrophysics , galaxy , active galactic nucleus , hubble ultra deep field , redshift , hubble deep field , astronomy , photometry (optics) , hubble space telescope , stars

We present the results of a 2-epoch variability survey in the Hubble DeepField with the goal of investigating the population of AGN to z=1. The primarydata sets analyzed for galactic variability are the original HDF observationsobtained in 1995 and a second V-band image obtained 5 years later in 2000. Wefind evidence for nuclear variability in 16 of 217 galaxies brighter thanV_nuc=27.5. Correcting for incompleteness and spurious detections, variablenuclei make up ~8% of the surveyed galaxies. Seven of our variable sources arecoincident with X-ray sources detected in the 2Ms Chandra survey. We find that44% of the variable nuclei are associated with mid-IR detections at 15 micronsand 31% are detected at 1.4GHz. Optical spectra are available for 13 of the 16variables. One is a broad-line AGN and 2 others show weak evidence of type 2AGNs. With the assumption that these variables are all active nuclei, weestimate the AGN LF at 0.4

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