K
Keiichi Ohnaka
Researcher at Catholic University of the North
Publications - 133
Citations - 4933
Keiichi Ohnaka is an academic researcher from Catholic University of the North. The author has contributed to research in topics: Very Large Telescope & Stars. The author has an hindex of 41, co-authored 131 publications receiving 4760 citations. Previous affiliations of Keiichi Ohnaka include Max Planck Society.
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Journal ArticleDOI
AMBER, the near-infrared spectro-interferometric three-telescope VLTI instrument
Romain Petrov,Fabien Malbet,Gerd Weigelt,P. Antonelli,Udo Beckmann,Y. Bresson,Alain Chelli,M. Dugué,Gilles Duvert,Sandro Gennari,L. Gluck,P. Kern,S. Lagarde,E. Le Coarer,Franco Lisi,Florentin Millour,K. Perraut,Pascal Puget,Fredrik T. Rantakyrö,S. Robbe-Dubois,A. Roussel,Piero Salinari,E. Tatulli,Gérard Zins,M. Accardo,Bram Acke,K. Agabi,E. Altariba,Brahim Arezki,Eric Aristidi,Carlo Baffa,J. Behrend,T. Blöcker,S. Bonhomme,S. Busoni,Frédéric Cassaing,J. M. Clausse,J. Colin,C. Connot,A. Delboulbe,A. Domiciano de Souza,Thomas Driebe,Philippe Feautrier,D. Ferruzzi,T. Forveille,E. Fossat,Renaud Foy,Didier Fraix-Burnet,A. Gallardo,Elisabetta Giani,C. Gil,A. Glentzlin,M. Heiden,M. Heininger,O. Hernandez Utrera,Karl-Heinz Hofmann,D. Kamm,Mario Kiekebusch,Stefan Kraus,D. Le Contel,J. M. Le Contel,T. Lesourd,Bruno Lopez,Morgan Lopez,Yves Magnard,Alessandro Marconi,G. Mars,G. Martinot-Lagarde,Philippe Mathias,Pierre Mege,J. L. Monin,D. Mouillet,Denis Mourard,E. Nussbaum,Keiichi Ohnaka,José Pacheco,C. Perrier,Yves Rabbia,S. Rebattu,François Reynaud,Andrea Richichi,Andrea Richichi,A. Robini,M. Sacchettini,Dieter Schertl,Markus Schöller,W. Solscheid,A. Spang,Ph. Stee,P. Stefanini,Michel Tallon,Isabelle Tallon-Bosc,D. Tasso,Leonardo Testi,F. Vakili,O. von der Lühe,J.-C. Valtier,Martin Vannier,N. Ventura +98 more
TL;DR: AMBER as mentioned in this paper is one of the VLTI instruments that combines up to three beams with low, moderate and high spectral resolutions in order to provide milli-arcsecond spatial resolution for compact astrophysical sources in the near-infrared wavelength domain.
Journal ArticleDOI
Interferometric data reduction with AMBER/VLTI. Principle, estimators, and illustration.
E. Tatulli,E. Tatulli,Florentin Millour,Florentin Millour,Alain Chelli,Gilles Duvert,Bram Acke,Bram Acke,O. Hernandez Utrera,Karl-Heinz Hofmann,Stefan Kraus,Fabien Malbet,P. Mège,Romain Petrov,Martin Vannier,G. Zins,P. Antonelli,Udo Beckmann,Y. Bresson,M. Dugué,Sandro Gennari,L. Glück,P. Kern,S. Lagarde,E. Le Coarer,Franco Lisi,Karine Perraut,Pascal Puget,Fredrik T. Rantakyrö,S. Robbe-Dubois,A. Roussel,Gerd Weigelt,M. Accardo,K. Agabi,E. Altariba,B. Arezki,Eric Aristidi,Carlo Baffa,J. Behrend,T. Blöcker,S. Bonhomme,S. Busoni,Frédéric Cassaing,J. M. Clausse,J. Colin,C. Connot,A. Delboulbé,A. Domiciano de Souza,Thomas Driebe,P. Feautrier,D. Ferruzzi,T. Forveille,E. Fossat,R. Foy,Didier Fraix-Burnet,A. Gallardo,Elisabetta Giani,C. Gil,C. Gil,A. Glentzlin,M. Heiden,M. Heininger,D. Kamm,Mario Kiekebusch,D. Le Contel,J. M. Le Contel,T. Lesourd,Bruno Lopez,Morgan Lopez,Y. Magnard,Alessandro Marconi,G. Mars,G. Martinot-Lagarde,Philippe Mathias,J. L. Monin,D. Mouillet,D. Mouillet,Denis Mourard,E. Nussbaum,Keiichi Ohnaka,J. A. de Freitas Pacheco,C. Perrier,Yves Rabbia,S. Rebattu,François Reynaud,Andrea Richichi,A. Robini,M. Sacchettini,Dieter Schertl,Markus Schöller,W. Solscheid,A. Spang,Ph. Stee,P. Stefanini,Michel Tallon,Isabelle Tallon-Bosc,D. Tasso,Leonardo Testi,F. Vakili,O. von der Lühe,J.-C. Valtier,N. Ventura +101 more
TL;DR: In this article, a data reduction method for single-mode interferometry is presented based on a direct modelling of the fringes in the detector plane, which can be derived for any single-source interferometer.
Journal ArticleDOI
Radiative transfer modeling of three-dimensional clumpy AGN tori and its application to NGC 1068
TL;DR: In this article, a new method for modeling near-and mid-infrared emission of 3D clumpy tori using Monte Carlo simulations is presented, where the radiation fields of individual clouds at various distances from the AGN and distribute these clouds within the torus region are determined from a theoretical approach of self-gravitating clouds close to the shear limit.
Journal ArticleDOI
Radiative Transfer Modeling of Three-Dimensional Clumpy AGN Tori and its Application to NGC 1068
TL;DR: In this paper, the authors used Monte Carlo simulations to estimate the radiation fields of individual clouds at various distances from the AGN and distribute these clouds within the torus region, showing that clumpiness in AGN tori can overcome the problem of overpronounced silicate features.
Journal ArticleDOI
Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage
Stefan Kraus,Gerd Weigelt,Yu. Yu. Balega,José A. Docobo,Karl-Heinz Hofmann,Th. Preibisch,Dieter Schertl,Vakhtang S. Tamazian,Thomas Driebe,Keiichi Ohnaka,Romain Petrov,Markus Schöller,Michael D. Smith +12 more
TL;DR: In this article, the authors used a near-infrared (H -a ndK-band) long-baseline interferometry with the ESO 3.6 m and the BTA 6 m telescopes (B � and V � -band) to reconstruct the first VLTI/AMBER closure-phase aperture synthesis image, showing the θ 1 Ori C system.