Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-22T22:34:32.116Z Has data issue: false hasContentIssue false
  • English
  • Français

Regularized OSIRIS 3D spectroscopy at the circumnuclear disk ionization front

Published online by Cambridge University Press:  22 May 2014

Thibaut Paumard ,
Mark R. Morris ,
Tuan Do  and
Andrea Ghez
Thibaut Paumard
Affiliation:
LESIA-Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot 5 place Jules Janssen, F-92190 Meudon, France. email: [email protected]
Mark R. Morris
Affiliation:
Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, USA
Tuan Do
Affiliation:
Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto M5S 3H4, ON, Canada
Andrea Ghez
Affiliation:
Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The Galactic central black hole and the central cluster of young stars are surrounded by a clumpy gas disk (the circumnuclear disk, CND) that rotates about them at a distance of ≃ 1 pc. The gas in this warm, turbulent, magnetized disk is ultimately likely to migrate into the central cavity and fuel future star formation and black hole accretion. We have observed two fields of approximately 20″ × 20″ in the CND at NIR wavelengths with the OSIRIS integral-field spectrometer at Keck Observatory. These two fields are located at the interface between the neutral and the ionized regions. Our data cover two H2 lines as well as the Brγ line of the Hi spectrum. The signal-to-noise ratio per spatial pixel of each line varies considerably across the field and becomes quite low in some regions. In order to avoid degrading the spatial resolution, we have developed a novel three-dimensional method to analyze the data in terms of regularized parameter maps. The method proves very efficient in retrieving all the information contained in the spectral line emission while not degrading the spatial resolution. We present this new method to analyze 3D spectroscopic data and describe our preliminary results on the structure of the ionized-neutral interface.

Keywords

methods: data analysistechniques: spectroscopicISM: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 109 - 113
Copyright
Copyright © International Astronomical Union 2014 

References

Bradford, C. M., Stacey, G. J., Nikola, T., Bolatto, A. D., Jackson, J. M., Savage, M. L., & Davidson, J. A. 2005, ApJ 623, 866CrossRefGoogle Scholar
Burton, M. G., Hollenbach, D. J., & Tielens, A. G. G. M. 1990, ApJ 365, 620CrossRefGoogle Scholar
Christopher, M. H., Scoville, N. Z., Stolovy, S. R., & Yun, M. S. 2005, ApJ 622, 346CrossRefGoogle Scholar
Gatley, I., Jones, T. J., Hyland, A. R., Wade, R., Geballe, T. R., & Krisciunas, K. 1986, MNRAS 222, 299CrossRefGoogle Scholar
Genzel, R. 1989, in: Morris, M. R. (ed.), The Center of the Galaxy, Proc. IAU Symposium No. 136 (Dordrecht: Kluwer), p. 393CrossRefGoogle Scholar
Güsten, R., Genzel, R., Wright, M. C. H., et al. 1987, ApJ 318, 124CrossRefGoogle Scholar
Jackson, J. M., Geis, N., Genzel, R., Harris, A. I., Madden, S., Poglitsch, A., Stacey, G. J., & Townes, C. H. 1993, ApJ 402, 173CrossRefGoogle Scholar
Larkin, J., Barczys, M., Krabbe, A., Adkins, S., Aliado, T., Amico, P., Brims, G., Campbell, R., Canfield, J., Gasaway, T., Honey, A., Iserlohe, C., Johnson, C., Kress, E., LaFreniere, D., Lyke, J., Magnone, K., Magnone, N., McElwain, M., Moon, J., Quirrenbach, A., Skulason, G., Song, I., Spencer, M., Weiss, J., & Wright, S. 2006, in: McLean, I. S. & Iye, M. (eds.), Ground-based and Airborne Instrumentation for Astronomy, Proc. SPIE, Volume 6269 (SPIE Press), p. 62691AGoogle Scholar
Marr, J. M., Wright, M. C. H., & Backer, D. C. 1993, ApJ 411, 667Google Scholar
Montero-Castano, M., Herrnstein, R. M., & Ho, P. T. P. 2009, ApJ 695, 1477CrossRefGoogle Scholar
Morris, M. R. & Serabyn, A. 1996, ARAA 34, 645CrossRefGoogle Scholar
Morris, M. R., Ghez, A., & Becklin, E. E. 1999, Adv. Sp. Res. 23, 959CrossRefGoogle Scholar
Mugnier, L. M., Fusco, T., & Conan, J. M. 2004, J Opt Soc Am A Opt Image Sci Vis 21, 1841CrossRefGoogle Scholar
Paumard, T., Maillard, J. P., & Morris, M. R. 2004, A&A 426, 81Google Scholar
Sternberg, A. & Dalgarno, A. 1989, ApJ 338, 197Google Scholar
Vollmer, B. & Duschl, W. J. 2001, A&A 367, 72Google Scholar
Vollmer, B. & Duschl, W. J. 2002, A&A 388, 128Google Scholar
Yusef-Zadeh, F., Stolovy, S. R., Burton, M., Wardle, M., & Ashley, M. C. B. 2001, ApJ 560, 749CrossRefGoogle Scholar