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Infrared spectroscopy of NGC 1068

  • D. L. DePoy
I. Spectral Studies in the Optical, Ultraviolet and Infrared
Part of the Lecture Notes in Physics book series (LNP, volume 307)

Abstract

Spectroscopy of the nucleus of the nearby Seyfert 2 galaxy NGC 1068 has been obtained using the IRTF and the facility Cooled-Grating Array Spectrometer (CGAS). The wavelengths observed covered the expected wavelengths of the Bry (n = 7 → 4), Brα (n = 5 → 4), and the Pfβ (n = 7 → 5) hydrogen recombination lines between 2.2 μm and 4.6 μm. The CGAS has a 32-element InSb array multiplexed by a Reticon and was used at a resolution of ∼250 km s−1, allowing accurate determination of the line profiles and surrounding continua simultaneously. For example, the S/N at each spectral position in the Brα line spectrum was ∼100. The data show that the infrared lines are not more broadened than the optical hydrogen recombination lines, suggesting that the presence of an obscured Seyfert 1-like active nucleus is unlikely unless the visual extinction through any obscuring material present is larger than ∼100 mag.

Keywords

Line Spectrum Spectral Position Line Ratio Line Observation Visual Extinction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • D. L. DePoy
    • 1
  1. 1.National Optical Astronomy ObservatoriesTucson

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