A novel approach for calculating galaxy rotation curves using spaxel cross-correlation and iterative smoothing

Abstract

Precise measurements of the internal dynamics of galaxies have proven of great importance for understanding the internal dark matter distribution of galaxies. We present a novel method for measuring the line-of-sight (LOS) velocities across the face of galaxies by cross-correlation of spectral pixels (spaxels) and an iterative method of smoothing. On simulated data the method can accurately recover the input LOS velocities for different types of spectra (absorption line dominated, emission line dominated, and differing shapes of the continuum), and can handle stellar population radial gradients. Most important of all, it continues to provide reliable measurements of LOS velocities with reasonable uncertainties even when the spectra are very low signal-to-noise (approaching $\sim 1$), which is a challenge for traditional template-fitting approaches. We apply our method to data from a real MaNGA galaxy as a demonstration and find promising results with good precision. This novel approach can be complementary to existing methods primarily based on template fitting.

arXiv comment21 pages, 17 figures, accepted for publication in MNRAS

References in corpus (43)

• 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
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• CIGALE: a python Code Investigating GALaxy Emission
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• Rotation Curves of Spiral Galaxies
• A Recipe for Galaxy Formation Shaun Cole
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• The Atlas3D project - XV. Benchmark for early-type galaxies scaling relations from 260 dynamical models: mass-to-light ratio, dark matter, Fundamental Plane and Mass Plane
• Stellar Population Inference with Prospector
• The MaNGA Integral Field Unit Fiber Feed System for the Sloan 2.5 m Telescope
• ULySS: A Full Spectrum Fitting Package
• The SDSS-IV MaNGA Sample: Design, Optimization, and Usage Considerations
• SDSS-IV MaNGA IFS Galaxy Survey --- Survey Design, Execution, and Initial Data Quality
• Stellar Content from high resolution galactic spectra via Maximum A Posteriori
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• Stellar populations in the nuclei of late-type spiral galaxies
• Smoothing Supernova Data to Reconstruct the Expansion History of the Universe and its Age
• Marvin: A Toolkit for Streamlined Access and Visualization of the SDSS-IV MaNGA Data Set
• Dynamical masses of early-type galaxies: a comparison to lensing results and implications for the stellar IMF and the distribution of dark matter
• Model independent tests of the standard cosmological model
• Template Rotation Curves for Disk Galaxies
• The SAMI Galaxy Survey: the third and final data release
• Model Independent Reconstruction of the Expansion History of the Universe and the Properties of Dark Energy
• The SAMI Galaxy Survey: Data Release Two with absorption-line physics value-added products
• GHASP: an Hα kinematic survey of spiral and irregular galaxies -- IX. The NIR, stellar and baryonic Tully-Fisher relations
• Neutral gas outflows in nearby [U]LIRGs via optical NaD feature
• The Inner Scale Length of Spiral Galaxy Rotation Curves
• Ionized gas kinematics of galaxies in the CALIFA survey I: Velocity fields, kinematic parameters of the dominant component, and presence of kinematically distinct gaseous systems
• Outflows in Star-forming Galaxies: Stacking Analyses of Resolved Winds and the Relation to Their Hosts' Properties
• H-alpha kinematics of S4G spiral galaxies-II. Data description and non-circular motions
• The SAMI Galaxy Survey: Stellar population radial gradients in early-type galaxies
• Tracing the Dynamical Mass in Galaxy Disks Using HI Velocity Dispersion and its Implications for the Dark Matter Distribution in Galaxies
• SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies
• Long slit spectroscopy of a sample of isolated spirals with and without an AGN
• Hector - a new massively multiplexed IFS instrument for the Anglo-Australian Telescope
• Evaluating Galaxy Dynamical Masses From Kinematics and Jeans Equilibrium in Simulations
• The Rotation Curves of Galaxies at Intermediate Redshift
• Dynamical masses of brightest cluster galaxies I: stellar velocity anisotropy and mass-to-light ratios
• Fast and Reliable Time Delay Estimation of Strong Lens Systems Using Method of Smoothing and Cross-Correlation
• VALES VIII: Weak ionized gas outflows in star-forming galaxies at $z\sim 0.15$ traced with VLT/MUSE

Cited by in corpus (1)

• Model independent approach for calculating galaxy rotation curves for low $S/N$ MaNGA galaxies