Hostname: page-component-76fb5796d-45l2p Total loading time: 0 Render date: 2024-04-26T01:04:36.168Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Bershady, M.A., Trevese, D. & Kron, R.G. 1998, ApJ, 496, 103 Google Scholar
Cheng, F.Z., Danese, L., De Zotti, G. & Franchesini, A. 1985, MNRAS, 212, 857 Google Scholar
Griffiths, R.E., Miyaji, T. & Ptak, A. 2000, BAAS 197, 5606 Google Scholar
Groth, E.J., Kristian, J. A., Lynds, R., O’Neil, E.J., Balsano, R., Rhodes, J., & the WFPC-1 IDT.1994, BAAS, 185, 5309 Google Scholar
Hawkins, M.R.S. 1986, MNRAS, 219, 417 Google Scholar
Ho, L.C., 2002, this volumeGoogle Scholar
Ho, L.C., Filippenko, A. & Sargent, W.L.W. 1997, ApJS, 112, 315 Google Scholar
Huchra, J. & Burg, R. 1992, ApJ, 393, 90 Google Scholar
Kennicutt, R.C. 1992, ApJS, 79, 255 CrossRefGoogle Scholar
Koo, D.C. et al. 1996, ApJ, 469, 535 Google Scholar
Koo, D.C., Kron, R.G. & Cudworth, K.M. 1986, PASP, 98, 285 Google Scholar
Maiolino, R. & Rieke, G.H. 1995, ApJ, 454, 95 CrossRefGoogle Scholar
Rola, C.S., Terlevich, E. & Terlevich, R.J. 1996, MNRAS, 289, 419 Google Scholar
Sarajedini, V.L., Green, R.F., Griffiths, R.E., & Ratnatunga, K. 1999, ApJ, 514, 746 Google Scholar
Sarajedini, V.L., Gilliland, R.L. & Phillips, M.M. 2000, AJ, 120, 2825 CrossRefGoogle Scholar
Sarajedini, V.L. et al. 2002, in preparationGoogle Scholar
Simard, L., Koo, D.C., Faber, S.M., Sarajedini, V.L., Vogt, N.P., Phillips, A.C., Gebhardt, K., Illingworth, G.D., & Wu, K.L. 1999, ApJ, 519, 565 Google Scholar
Simard, L. et al. 2001, ApJ, submittedGoogle Scholar
Tresse, L., Rola, C. S., Hammer, F., Stasinska, G., Le Fevre, O., Lilly, S.J. & Crampton, D. 1996, MNRAS, 281, 847 Google Scholar
Trevese, D. & Kron, R.G. 1990, in Variability of Active Galactic Nuclei, ed. Miller, H.R. & J.P., Witta (Cambridge: Cambridge University Press), 72 Google Scholar
Veilleux, S. & Osterbrock, D.E. 1987, ApJS, 63, 295 Google Scholar
Wisotzki, L. 2002, this volumeGoogle Scholar