Journal Article

Nuclear and extended spectra of NGC 1068 – I. Hints from near-infrared spectroscopy

Lucimara P. Martins, Alberto Rodríguez-Ardila, Ronaldo de Souza and Ruth Gruenwald

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 4, pages 2168-2184
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI:
Nuclear and extended spectra of NGC 1068 – I. Hints from near-infrared spectroscopy

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We report the first simultaneous zJHK spectroscopy on the archetypical Seyfert 2 galaxy NGC 1068 covering the wavelength region 0.9–2.4 μm. The slit, aligned in the north–south direction and centred in the optical nucleus, maps a region 300 pc in radius at subarcsec resolution, with a spectral resolving power of 360 km s−1. This configuration allows us to study the physical properties of the nuclear gas including that of the north side of the ionization cone, map the strong excess of continuum emission in the K band and attributed to dust and study the variations, both in flux and profile, in the emission lines. Our results show the following. (1) Mid- to low-ionization emission lines are split into two components, whose relative strengths vary with the position along the slit and seem to be correlated with the jet. (2) The coronal lines are single-peaked and are detected only in the central few hundred of pc from the nucleus. (3) The absorption lines indicate the presence of intermediate age stellar population, which might be a significant contributor to the continuum in the near-IR spectra. (4) Through some simple photoionization models we find photoionization as the main mechanism powering the emitting gas. (5) Calculations using stellar features point to a mass concentration inside the 100–200 pc of about 1010 M.

Keywords: galaxies: active; galaxies: individual: NGC 1068; galaxies: Seyfert; infrared: galaxies

Journal Article.  9181 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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