Molecular material within 100 pc around the AGN in NGC1068 from ISAAC/VLT observations

Emmanuel Galliano; Danielle Alloin

doi:10.1117/12.456647

13 February 2003 Molecular material within 100 pc around the AGN in NGC1068 from ISAAC/VLT observations

Emmanuel Galliano, Danielle Alloin

Proceedings Volume 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II; (2003) https://doi.org/10.1117/12.456647
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We present near-IR long slit spectroscopic data obtained with ISAAC on VLT/ANTU (ESO/Paranal) to produce Bracket gamma and H2 emission line maps and line profile grids of the central 4"×4" region surrounding the central engine of NGC1068. This paper summarizes the results presented in Galliano & Alloin. The seeing quality together with the use of an 0.3" wide slit and 0.3" slit position offsets allow to perform 2D-spectroscopy at 0.5" spatial resolution. The spectral resolution corresponds to 35km s^-1. An asymmetric distribution of H₂ emission is observed: no H₂ emission is detected at the location of the 2.2 μm continuum core, while two conspicuous H₂ knots of are detected at about 1" East and West of the central engine. These knots show a projected velocity difference of 140km s^-1that we interpreted as the signature of a rotating disk of molecular material. The H₂ emission line profiles appear highly asymmetric with their low velocity wing being systematically more extended than their high velocity wing. A simple way to account for the changes of the H₂ line profiles over the entire 4"×4" region, is to consider that the emission of a radial outflow is superimposed over the emission of the rotating molecular disk. We present a model of such a kinematical configuration and compare our predicted H₂ emission line profiles to the observed ones.

Citation Download Citation

Emmanuel Galliano and Danielle Alloin "Molecular material within 100 pc around the AGN in NGC1068 from ISAAC/VLT observations", Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); https://doi.org/10.1117/12.456647

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KEYWORDS

Bromine

Ultraviolet radiation

Clouds

Galactic astronomy

K band

Kinematics

X-rays

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