Deprojection and stellar dynamical modelling of boxy/peanut bars in edge-on discs

Author:

Dattathri Shashank12ORCID,Valluri Monica1ORCID,Vasiliev Eugene3ORCID,Wheeler Vance14ORCID,Erwin Peter5ORCID

Affiliation:

1. Department of Astronomy, University of Michigan , 1085 S. University Avenue, Ann Arbor, MI 48109 , USA

2. Department of Astronomy, Yale University , PO. Box 208101, New Haven, CT 06520 , USA

3. Institute of Astronomy, University of Cambridge , Madingley Road, CB3 0HA , UK

4. Department of Physics, University of Chicago , Chicago, IL 60637 , USA

5. Max-Planck-Insitut für extraterrestrische Physik , Giessenbachstrasse, D-85748 Garching , Germany

Abstract

ABSTRACT We present a new method to infer the 3D luminosity distributions of edge-on barred galaxies with boxy-peanut/X (BP/X) shaped structures from their 2D surface brightness distributions. Our method relies on forward modelling of newly introduced parametric 3D density distributions for the BP/X bar, disc and other components using an existing image fitting software package (imfit). We validate our method using an N-body simulation of a barred disc galaxy with a moderately strong BP/X shape. For fixed orientation angles, the derived 3D BP/X-shaped density distribution is shown to yield a gravitational potential that is accurate to at least 5 per cent and forces that are accurate to at least 15 per cent, with average errors being $\sim 1.5~{{\ \rm per\ cent}}$ for both. When additional quantities of interest, such as the orientation of the bar to the line of sight, its pattern speed, and the stellar mass-to-light ratio are unknown they can be recovered to high accuracy by providing the parametric density distribution to the Schwarzschild modelling code FORSTAND. We also explore the ability of our models to recover the mass of the central supermassive black hole. This method is the first to be able to accurately recover both the orientation of the bar to the line of sight and its pattern speed when the disc is perfectly edge-on.

Funder

National Science Foundation

Space Telescope Science Institute

Publisher

Oxford University Press (OUP)

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