Self-consistent bulge/disk/halo galaxy dynamical modeling using integral field kinematics

Abstract

We introduce a method for modeling disk galaxies designed to take full advantage of data from integral field spectroscopy (IFS). The method fits equilibrium models to simultaneously reproduce the surface brightness, rotation and velocity dispersion profiles of a galaxy. The models are fully self-consistent 6D distribution functions for a galaxy with a Sersic-profile stellar bulge, exponential disk and parametric dark matter halo, generated by an updated version of GalactICS. By creating realistic flux-weighted maps of the kinematic moments (flux, mean velocity and dispersion), we simultaneously fit photometric and spectroscopic data using both maximum-likelihood and Bayesian (MCMC) techniques. We apply the method to a GAMA spiral galaxy (G79635) with kinematics from the SAMI Galaxy Survey and deep $g$- and $r$-band photometry from the VST-KiDS survey, comparing parameter constraints with those from traditional 2D bulge-disk decomposition. Our method returns broadly consistent results for shared parameters, while constraining the mass-to-light ratios of stellar components and reproducing the HI-inferred circular velocity well beyond the limits of the SAMI data. While the method is tailored for fitting integral field kinematic data, it can use other dynamical constraints like central fibre dispersions and \HI circular velocities, and is well-suited for modelling galaxies with a combination of deep imaging and HI and/or optical spectra (resolved or otherwise). Our implementation (MagRite) is computationally efficient and can generate well-resolved models and kinematic maps in under a minute on modern processors.

ApJ accepted; 21 pages, 12 figures

References in corpus (55)

• A Universal Density Profile from Hierarchical Clustering
• Detailed Structural Decomposition of Galaxy Images
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• THINGS: The HI Nearby Galaxy Survey
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• The Atlas3D project -- I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• Galaxy And Mass Assembly: Stellar Mass Estimates
• A concise reference to (projected) Sersic R^{1/n} quantities, including Concentration, Profile Slopes, Petrosian indices, and Kron Magnitudes
• A Catalog of Bulge+Disk Decompositions and Updated Photometry for 1.12 Million Galaxies in the Sloan Digital Sky Survey
• Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models
• The Sydney-AAO Multi-object Integral field spectrograph (SAMI)
• The SAURON project. II. Sample and early results
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• SkyMapper and the Southern Sky Survey
• Shapes and Shears, Stars and Smears: Optimal Measurements for Weak Lensing
• The SAMI Galaxy Survey: instrument specification and target selection
• The Kilo-Degree Survey
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• Stellar population models at high spectral resolution
• Galaxy Masses
• The first and second data releases of the Kilo-Degree Survey
• Angular momentum and galaxy formation revisited
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• New Lessons from the HI Size-Mass Relation of Galaxies
• Equilibrium Disk-Bulge-Halo Models for the Milky Way and Andromeda Galaxies
• Dynamical Blueprints for Galaxies
• Made-to-measure N-body systems
• The SAMI Galaxy Survey: Revisiting Galaxy Classification Through High-Order Stellar Kinematics
• Noise bias in weak lensing shape measurements
• A Parallel Tree Code
• Fundamental Mass-Spin-Morphology Relation of Spiral Galaxies
• The impact of bars on disk breaks as probed by S4G imaging
• Models of our Galaxy II
• Galaxy And Mass Assembly (GAMA): The galaxy stellar mass function to $z=0.1$ from the r-band selected equatorial regions
• The Planetary Nebula System of M33
• The DiskMass Survey. VI. Gas and stellar kinematics in spiral galaxies from PPak integral-field spectroscopy
• ProFit: Bayesian Profile Fitting of Galaxy Images
• The SAMI Galaxy Survey: Cubism and covariance, putting round pegs into square holes
• Density-potential pairs for spherical stellar systems with Sersic light-profiles and (optional) power-law cores
• Galaxy And Mass Assembly (GAMA): ugrizYJHK Sérsic luminosity functions and the cosmic spectral energy distribution by Hubble type
• SDSS-IV MaNGA: Bulge-Disc Decomposition of IFU Datacubes (BUDDI)
• Untangling galaxy components: full spectral bulge-disc decomposition
• The SAMI Pilot Survey: Stellar Kinematics of Galaxies in Abell 85, 168 and 2399
• The effects of dust on the photometric parameters of decomposed disks and bulges
• Mergers in Galaxy Groups - I. Structure and Properties of Elliptical Remnants
• The Next Generation Virgo Cluster Survey. VII. The intrinsic shapes of low-luminosity galaxies in the core of the Virgo cluster, and a comparison with the Local Group
• Rotational Widths for Use in the Tully-Fisher Relation. II. The Impact of Surface Brightness
• Applying Schwarzschild's orbit superposition method to barred or non-barred disc galaxies
• Action-based Dynamical Modelling for the Milky Way Disk
• Dynamical Models for NGC 6503 using a Markov Chain Monte Carlo Technique
• The SAMI Galaxy Survey: Gas Streaming and Dynamical M/L in Rotationally Supported Systems

Cited by in corpus (14)

• AGAMA: Action-based galaxy modelling architecture
• Recovering ${\lambda }_R$ and $V/\sigma$ from seeing-dominated IFS data
• The Fornax3D project: Assembly histories of lenticular galaxies from a combined dynamical and population orbital analysis
• SDSS IV MaNGA: Full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies
• ProFuse: Physical Multi-Band Structural Decomposition of Galaxies and the Mass-Size-Age Plane
• The SAMI Galaxy Survey: Bayesian Inference for Gas Disk Kinematics using a Hierarchical Gaussian Mixture Model
• The SAMI Galaxy Survey: The role of disc fading and progenitor bias in kinematic transitions
• Deep Extragalactic VIsible Legacy Survey (DEVILS): The emergence of bulges and decline of disk growth since $z=1$
• GalactICS with Gas
• Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics
• SAMI-HI: The HI view of the H$\alpha$ Tully-Fisher relation and data release
• The information on halo properties contained in spectroscopic observations of late-type galaxies
• Simulating non-axisymmetric flows in disc galaxies
• The fragility of thin discs in galaxies -- I. Building tailored N-body galaxy models