Extragalactic astronomy with the OHANA array

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Title:		Extragalactic astronomy with the OHANA array
Authors:		Woillez, Julien; Sol, Helene; Lai, Olivier; Guyon, Olivier; Perrin, Guy
Affiliation:		AA(Observatoire de Paris-Meudon (France)), AB(Observatoire de Paris-Meudon (France)), AC(Canada-France-Hawaii Telescope Corp. (USA)), AD(Univ. of Hawaii (USA)), AE(Observatoire de Paris-Meudon (France))
Journal:		Interferometry for Optical Astronomy II. Edited by Wesley A. Traub . Proceedings of the SPIE, Volume 4838, pp. 1389-1395 (2003). (SPIE Homepage)
Publication Date:		02/2003
Origin:		SPIE
Abstract Copyright:		(c) 2003: SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Bibliographic Code:		2003SPIE.4838.1389W

Abstract

The Optical Hawaiian Array for Nanoradian Astronomy (OHANA) will allow resolutions on the order of a fraction of a milliarcsecond in the near infrared. This corresponds to the suspected size of the Broad Line Region and might even allow to study the structure of the base of jets. Preliminary studies with baselines on the order of or greater than 200 meters will be needed to understand these complex objects and successively refine existing models. The continuum visibilities will distinguish any unresolved source from resolved ones. Spectrally resolved visibilities in the H band and in Paschen lines will directly test competing models for the velocity structures that produce the observed line broadening. According to the unified model, the results of these measurements may be expected to depend on the relative viewing geometry. In Phase II, OHANA will be able to select, from many dozens of candidate sources, those most likely to present distinctive differences. A preparatory survey with adaptive optics is already under way. Four different scientific cases involving the OHANA array are reviewed: Active Galactic Nuclei geometries, Broad Line Region tomography, Broad Line Region dynamics, absolute distance measurements with Active Galactic Nuclei.

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