Variable Galaxies in the Hubble Deep Field | Zendy

Vicki L. Sarajedini | Zendy; Ronald L. Gilliland | Zendy; M. M. Phillips | Zendy

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Variable Galaxies in the Hubble Deep Field

Author(s) -

Vicki L. Sarajedini,

Ronald L. Gilliland,

M. M. Phillips

Publication year - 2000

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/316881

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

We present results from a study to detect variable galaxies in the HubbleDeep Field North. The goal of this project is to investigate the number densityof AGN at z=1 through the detection of variable galaxy nuclei. The advantage ofHST is the ability to do accurate photometry within smaller apertures, thusallowing us to probe much lower AGN/host galaxy luminosity ratios than can bedone from the ground. The primary data sets analyzed for galactic variabilityfollow from the original HDF-N observations in December 1995 and a second epochobtained two years later. We have detected nuclear variability at or above the 3 sigma level in 8 of633 HDF galaxies at I<27. Only 2 detections would be expected by chance in anormal distribution. At least one of these 8 has been spectroscopicallyconfirmed as a Seyfert 1 galaxy. Based on the AGN structure function forvariability, the estimated luminosity of the varying component in each galaxylies in the range -19.5

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