The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns

A. C. Quillen, Shanna Shaked, A. Alonso-Herrero, Colleen McDonald, Ariane Lee, Marcia J Rieke, George H. Rieke

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We present a study of Seyfert 1.5-2.0 galaxies observed at two epochs with the Rubble Space Telescope (HST) at 1.6 μm. We find that unresolved nuclear emission from nine of 14 nuclei varies at the level of 10%-40% on timescales of 0.7-14 months, depending upon the galaxy. A control sample of Seyfert galaxies lacking unresolved sources and galaxies lacking Seyfert nuclei show less than 3% instrumental variation in equivalent aperture measurements. This proves that the unresolved sources are nonstellar and associated with the central parsecs of active galactic nuclei. Unresolved sources in Seyfert 1.8 and 1.9 galaxies are not usually detected in HST optical surveys; however, high angular resolution infrared observations will provide a way to measure time delays in these galaxies.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume532
Issue number1 PART 2
StatePublished - Mar 20 2000

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galaxies
timescale
Seyfert galaxies
nuclei
angular resolution
active galactic nuclei
time lag
apertures
time measurement
telescopes
high resolution

Keywords

  • Galaxies: active
  • Galaxies: nuclei
  • Galaxies: Seyfert
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Quillen, A. C., Shaked, S., Alonso-Herrero, A., McDonald, C., Lee, A., Rieke, M. J., & Rieke, G. H. (2000). The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns. Astrophysical Journal, 532(1 PART 2).

The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns. / Quillen, A. C.; Shaked, Shanna; Alonso-Herrero, A.; McDonald, Colleen; Lee, Ariane; Rieke, Marcia J; Rieke, George H.

In: Astrophysical Journal, Vol. 532, No. 1 PART 2, 20.03.2000.

Research output: Contribution to journalArticle

Quillen, AC, Shaked, S, Alonso-Herrero, A, McDonald, C, Lee, A, Rieke, MJ & Rieke, GH 2000, 'The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns', Astrophysical Journal, vol. 532, no. 1 PART 2.
Quillen AC, Shaked S, Alonso-Herrero A, McDonald C, Lee A, Rieke MJ et al. The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns. Astrophysical Journal. 2000 Mar 20;532(1 PART 2).
Quillen, A. C. ; Shaked, Shanna ; Alonso-Herrero, A. ; McDonald, Colleen ; Lee, Ariane ; Rieke, Marcia J ; Rieke, George H. / The variability of Seyfert 1.8 and 1.9 galaxies at 1.6 microns. In: Astrophysical Journal. 2000 ; Vol. 532, No. 1 PART 2.
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AU - Rieke, George H.

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KW - Infrared: galaxies

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