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Spectroscopic and Variability Surveys for AGN in the Groth Survey Strip

Published online by Cambridge University Press:  12 April 2016

Vicki Sarajedini
Vicki Sarajedini*
Affiliation:
Department of Astronomy, University of Florida, Gainesville, FL 32611

Abstract

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Preliminary results are presented for a spectroscopic survey of the Groth Survey Strip (GSS), a 30 by 3 arcminute region of the sky imaged with HST, for which several hundred galaxy spectra have been obtained as part of the DEEP project (http://deep.ucolick.org). At least 6 broad-line AGNs (primarily Seyfert 1s) have been detected as well as several narrow-line Seyfert 2 candidates. The seyfert galaxies detected in our survey have integrated absolute magnitudes extending to MB ~-17.5, probing fainter magnitudes and higher redshifts than existing optical spectroscopic surveys. We also discuss a variablity study of the GSS using the original HST images from 1994 and new images obtained in 2001. The high resolution obtained with HST allows us to isolate and measure variable galactic nuclei too faint to be detected from the ground, reaching nuclear magnitudes of MB~-16 in galaxies to z~0.8. The combination of these techniques provide a powerful probe of the population of low-luminosity AGNs at moderate redshifts.

Type
Part 1. Optical Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 75 - 80
Copyright
Copyright © Astronomical Society of the Pacific 2002

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