Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-29T02:17:31.275Z Has data issue: false hasContentIssue false

Decoding 3D Disk Structure and Dynamics Using Doppler Tomography

Published online by Cambridge University Press:  09 February 2015

Arthur D. Eigenbrot
Affiliation:
Department of Astronomy, University of Wisconsin - Madison, 475 N. Charter St. Madison, WI, 53703, USA email: [email protected]
Matthew A. Bershady
Affiliation:
Department of Astronomy, University of Wisconsin - Madison, 475 N. Charter St. Madison, WI, 53703, USA email: [email protected]
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.

We demonstrate a method to measure both rotation curves and 3D ISM structure in edge-on galaxies. Two-dimensional spectral coverage of edge-on galaxies reveals substantial deviations in emission line shapes from a purely gaussian profile that vary with radius and height. Non-gaussianity is quantified using statistical moments to third order. We infer the 3D density distribution by comparing the measured line profiles to synthetic line-of-sight velocity distributions from a suite of three-dimensional galaxy models with different 3D distributions of dust and gas and different rotation curve shapes and amplitudes. We apply this method using multi-position longslit data of nearby edge-on galaxy ESO 435-G25 and find our derived rotation curve matches measured HI rotation from envelope fitting but requires a flared dust disk to accurately describe the radial and vertical trends in the measured statistical moments. Our results are consistent with dynamical expectations for constant pressure support in a disk with exponentially declining surface-density.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Andersen, D. R. & Bershady, M. A. 2013, ApJ, 768CrossRefGoogle Scholar
Andersen, D. R., et al. 2006, ApJS, 166Google Scholar
Kobulnicky, H. A., et al. 2002, Proceedings of SPIE, 4841, 1634CrossRefGoogle Scholar
Kregel, M. & van der Kruit, P. C. 2004 MNRAS, 352, 787803CrossRefGoogle Scholar
Xilouris, E. M., Byun, Y. I., Kylafis, N. D., Paleologou, E. V., & Papamastorakis, J. 1999, A&A, 34Google Scholar