Spatially non-parametric recovery of intrinsic kinematic maps in pre- to post-merger galaxies

Abstract

We introduce an adaptable kinematic modelling tool called ROHSA-SNAPD, "Spatially Non-parametric Approach to PSF Deconvolution using ROHSA". ROHSA-SNAPD utilises kinematic regularisation to forward model the intrinsic emission-line flux and kinematics (velocity and linewidth) of 3D data cubes. Kinematic regularisation removes the need to assume an underlying rotation model (eg. exponential disc, tilted-ring) to deconvolve kinematic data. We evaluate the code on mock observations of simulated galaxies: one idealised disc model and three more complex galaxies from a cosmological simulation with varying levels of kinematic disturbance, from pre-merger to post-merger state. The mock observations are designed to approximate published results at $z\sim 1-2$ from 8-metre class near-infrared spectroscopic facilities, using realistic observational parameters including spatial and spectral resolution, noise and point spread function. We demonstrate that ROHSA-SNAPD can effectively recover the intrinsic kinematics of complex systems whilst accounting for observational effects. ROHSA-SNAPD is publicly released on Github.

This is a pre-copyedited, author-produced version of an article accepted for publication in RAS Techniques & Instruments (RASTI) following peer review. 26 pages, 26 figures

References in corpus (31)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• The rapid formation a large rotating disk galaxy three billion years after the Big Bang
• The Evolution of the Star-forming Interstellar Medium across Cosmic Time
• Kinemetry of SINS High-Redshift Star-Forming Galaxies: Distinguishing Rotating Disks from Major Mergers
• Star-Forming Galaxies at Cosmic Noon
• Ionized gas outflows and global kinematics of low-z luminous star forming galaxies
• The role of mergers and halo spin in shaping galaxy morphology
• Geometry of Star-Forming Galaxies from SDSS, 3D-HST and CANDELS
• The KMOS^3D Survey: data release and final survey paper
• A consistent measure of the merger histories of massive galaxies using close-pair statistics I: Major mergers at $z<3.5$
• Rotation Curves in z~1-2 Star-Forming Disks: Evidence for Cored Dark Matter Distributions
• The KMOS Redshift One Spectroscopic Survey (KROSS): the origin of disk turbulence in z~0.9 star-forming galaxies
• The KMOS Redshift One Spectroscopic Survey (KROSS): rotational velocities and angular momentum of z~0.9 galaxies
• The KLEVER Survey: Spatially resolved metallicity maps and gradients in a sample of 1.2 < z < 2.5 lensed galaxies
• Major Merging History in CANDELS. I. Evolution of the Incidence of Massive Galaxy-Galaxy Pairs from z=3 to z~0
• Distinguishing Mergers and Disks in High Redshift Observations of Galaxy Kinematics
• ROHSA: Regularized Optimization for Hyper-Spectral Analysis - Application to phase separation of 21 cm data
• Dynamical characterization of galaxies up to $z\sim 7$
• EMERGE: Empirical predictions of galaxy merger rates since $z\sim 6$
• The ALMA-ALPAKA survey I: high-resolution CO and [CI] kinematics of star-forming galaxies at z = 0.5-3.5
• ALMA hints at the presence of turbulent disk galaxies at z > 5
• ERGO-ML I: Inferring the assembly histories of IllustrisTNG galaxies from integral observable properties via invertible neural networks
• RC100: Rotation Curves of 100 Massive Star-Forming Galaxies at z=0.6-2.5 Reveal Little Dark Matter on Galactic Scales
• The KMOS Galaxy Evolution Survey (KGES): the angular momentum of star-forming galaxies over the last ~10 Gyr
• The SAMI Galaxy Survey: the difference between ionised gas and stellar velocity dispersions
• SimSpin -- Constructing mock IFS kinematic data cubes
• The SAMI Galaxy Survey: Bayesian Inference for Gas Disk Kinematics using a Hierarchical Gaussian Mixture Model
• Multiresolution angular momentum measurements of z~1.5-2 star-forming galaxies