SH$\alpha$DE: Survey description and mass-kinematics scaling relations for dwarf galaxies

Abstract

The Study of H$\alpha$ from Dwarf Emissions (SH$\alpha$DE) is a high spectral resolution (R=13500) H$\alpha$ integral field survey of 69 dwarf galaxies with stellar masses $10^6<M_{\star }<10^9{\mathrm{M}}_{\odot }$. The survey used FLAMES on the ESO Very Large Telescope. SH$\alpha$DE is designed to study the kinematics and stellar populations of dwarf galaxies using consistent methods applied to massive galaxies and at matching level of detail, connecting these mass ranges in an unbiased way. In this paper we set out the science goals of SH$\alpha$DE, describe the sample properties, outline the data reduction and analysis processes. We investigate the $\log M_{\star }-\log S_{0.5}$ mass-kinematics scaling relation, which have previously shown potential for combining galaxies of all morphologies in a single scaling relation. We extend the scaling relation from massive galaxies to dwarf galaxies, demonstrating this relation is linear down to a stellar mass of $M_{\star }\sim 10^{8.6}{\mathrm{M}}_{\odot }$. Below this limit, the kinematics of galaxies inside one effective radius appear to be dominated by the internal velocity dispersion limit of the H$\alpha$-emitting gas, giving a bend in the $\log M_{\star }-\log S_{0.5}$ relation. Replacing stellar mass with total baryonic mass using gas mass estimate reduces the severity but does not remove the linearity limit of the scaling relation. An extrapolation to estimate the galaxies' dark matter halo masses, yields a $\log M_h-\log S_{0.5}$ scaling relation that is free of any bend, has reduced curvature over the whole mass range, and brings galaxies of all masses and morphologies onto the virial relation.

19 pages, 13 figures, 5 tables; published in MNRAS

References in corpus (43)

• The Gaia mission
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• UV Star Formation Rates in the Local Universe
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• The SAMI Galaxy Survey: instrument specification and target selection
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• An Objective Definition for the Main Sequence of Star-Forming Galaxies
• What is Driving the HI Velocity Dispersion?
• Star Formation in Disk Galaxies. I. Formation and Evolution of Giant Molecular Clouds via Gravitational Instability and Cloud Collisions
• A Survey of Galaxy Kinematics to z ~ 1 in the TKRS/GOODS-N Field. I. Rotation and Dispersion Properties
• The SAMI Galaxy Survey: the link between angular momentum and optical morphology
• The SAMI Galaxy Survey: Revisiting Galaxy Classification Through High-Order Stellar Kinematics
• Revisiting the Integrated Star Formation Law. Paper I: Non-Starbursting Galaxies
• High star formation rates as the origin of turbulence in early and modern disk galaxies
• The main sequence of star forming galaxies I. The local relation and its bending
• LITTLE THINGS in 3D: robust determination of the circular velocity of dwarf irregular galaxies
• Small scatter and nearly-isothermal mass profiles to four half-light radii from two-dimensional stellar dynamics of early-type galaxies
• Building disc structure and galaxy properties through angular momentum: The DARK SAGE semi-analytic model
• The SAMI Galaxy Survey: Towards a unified dynamical scaling relation for galaxies of all types
• A statistical investigation of the mass discrepancy-acceleration relation
• The Multi-Wavelength Tully-Fisher relation with spatially resolved HI kinematics
• What controls the ionized gas turbulent motions in dwarf galaxies?
• The Radial Tully-Fisher relation for spiral galaxies I
• Systematic trends in total-mass profiles from dynamical models of early-type galaxies
• Hubble Space Telescope survey of the Perseus Cluster - I: The structure and dark matter content of cluster dwarf spheroidals
• Clustering properties of galaxies selected in stellar mass: Breaking down the link between luminous and dark matter in massive galaxies from z=0 to z=2
• Comparing galaxy formation in semi-analytic models and hydrodynamical simulations
• Formation of S0 galaxies through mergers. Evolution in the Tully-Fisher relation since $z\sim 1$
• The SAMI Galaxy Survey: energy sources of the turbulent velocity dispersion in spatially-resolved local star-forming galaxies
• The SAMI Galaxy Survey: Gas velocity dispersions in low-$z$ star-forming galaxies and the drivers of turbulence
• What drives the velocity dispersion of ionized gas in star-forming galaxies?
• The SAMI Galaxy Survey: Asymmetry in Gas Kinematics and its links to Stellar Mass and Star Formation
• xGASS: passive disks do not host unexpectedly large reservoirs of cold atomic hydrogen
• The SAMI Galaxy Survey: mass-kinematics scaling relations
• The SAMI Galaxy Survey: The Low-Redshift Stellar Mass Tully-Fisher Relation
• The SAMI galaxy survey: Galaxy Interactions and Kinematic Anomalies in Abell 119
• On How to Extend the NIR Tully-Fisher Relation to be Truly All-Sky
• Rotational Dynamics and Star Formation in the Nearby Dwarf Galaxy NGC 5238
• Comparing Galaxy Clustering in Horizon-AGN Simulated Lightcone Mocks and VIDEO Observations
• Pipe3D Stellar and Gaseous Velocity Dispersions for CALIFA Galaxies

Cited by in corpus (12)

• The baryonic specific angular momentum of disc galaxies
• The SAMI Galaxy Survey: stellar population and structural trends across the Fundamental Plane
• GRUMPY: a simple framework for realistic forward-modelling of dwarf galaxies
• Gas dynamics in dwarf galaxies as testbeds for dark matter and galaxy evolution
• The SAMI galaxy survey: galaxy size can explain the offset between star-forming and passive galaxies in the mass-metallicity relationship
• The SAMI Galaxy Survey: the difference between ionised gas and stellar velocity dispersions
• The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment
• Dark Matter search in dwarf irregular galaxies with the Fermi Large Area Telescope
• SAMI-HI: The HI view of the H$\alpha$ Tully-Fisher relation and data release
• EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
• A Shallow Slope for the Stellar Mass--Angular Momentum Relation of Star-Forming Galaxies at $1.5<z<2.5$
• CROCODILE-DWARF: Assembly and Kinematics of Field Dwarf Galaxies with GADGET4-OSAKA