Monitoring of the optical and 2.5-11.7 mu m spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO

M SantosLleó, J Clavel, B Schulz, B Altieri, P Barr, D Alloin, P Berlind, R Bertram, DM Crenshaw, RA Edelson, U Giveon, Keith Douglas Horne, JP Huchra, S Kaspi, GA Kriss, JH Krolik

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36 Citations (Scopus)

Abstract

Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 mum spectrum. Contemporaneous optical photometric and spectrophotometric observations are also presented. The galaxy appears as a point-like source at the resolution of the ISOCAM instrument (4-5 "). The 2.5-11.7 mum average spectrum of the nucleus in Mrk 279 shows a strong power law continuum with alpha = -0.80 +/- 0.05 (F nu proportional to nu (alpha)) and weak PAK emission features. The Mrk 279 spectral energy distribution shows a mid-IR bump, which extends from 2 to 15-20 mum The mid-IR bump is consistent with thermal emission from dust grains at a distance of greater than or similar to 100 It-d. No significant variations of the mid-IR flux have been detected during our observing campaign, consistent with the relatively low amplitude (similar to 10% rms) of the optical variability during the campaign. The time delay for H beta line emission in response to the optical continuum variations is tau = 16.7(-5.6)(+5.3), days, consistent with previous measurements.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalAstronomy & Astrophysics
Volume369
Publication statusPublished - Apr 2001

Keywords

  • galaxies : active
  • galaxies : individual : Mrk 279
  • galaxies : nuclei
  • galaxies : Seyfert
  • infrared : galaxies
  • ACTIVE GALACTIC NUCLEI
  • BROAD-LINE REGION
  • ADAPTIVE OPTICS
  • X-RAY
  • INFRARED VARIABILITY
  • HOMOGENEOUS SAMPLE
  • HOT DUST
  • EMISSION
  • QUASARS
  • SPECTROSCOPY

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