SAMI-HI: The HI view of the H$\alpha$ Tully-Fisher relation and data release

Abstract

We present SAMI-HI, a survey of the atomic hydrogen content of 296 galaxies with integral field spectroscopy available from the SAMI Galaxy Survey. The sample spans nearly 4 dex in stellar mass ($M_{\star }=10^{7.4}-10^{11.1}{\mathrm{M}}_{\odot }$), redshift $z<0.06$, and includes new Arecibo observations of 153 galaxies, for which we release catalogues and HI spectra. We use these data to compare the rotational velocities obtained from optical and radio observations and to show how systematic differences affect the slope and scatter of the stellar-mass and baryonic Tully-Fisher relations. Specifically, we show that H$\alpha$ rotational velocities measured in the inner parts of galaxies (1.3 effective radii in this work) systematically underestimate HI global measurements, with HI/H$\alpha$ velocity ratios that increase at low stellar masses, where rotation curves are typically still rising and H$\alpha$ measurements do not reach their plateau. As a result, the H$\alpha$ stellar mass Tully-Fisher relation is steeper (when $M_{\star }$ is the independent variable) and has larger scatter than its HI counterpart. Interestingly, we confirm the presence of a small fraction of low-mass outliers of the H$\alpha$ relation that are not present when HI velocity widths are used and are not explained by "aperture effects". These appear to be highly disturbed systems for which H$\alpha$ widths do not provide a reliable estimate of the rotational velocity. Our analysis reaffirms the importance of taking into account differences in velocity definitions as well as tracers used when interpreting offsets from the Tully-Fisher relation, at both low and high redshifts and when comparing with simulations.

18 pages, 12 figures. Accepted for publication in MNRAS

References in corpus (42)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• Forming Disk Galaxies in Lambda CDM Simulations
• The SAMI Galaxy Survey: instrument specification and target selection
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• Australian Square Kilometre Array Pathfinder: I. System Description
• The Baryon Content of Extremely Low Mass Dwarf Galaxies
• Scaling Relations of Spiral Galaxies
• WALLABY -- An SKA Pathfinder HI Survey
• The cold interstellar medium of galaxies in the Local Universe
• The Tully-Fisher Relation and Its Residuals for a Broadly Selected Sample of Galaxies
• The mass distribution in early-type disk galaxies: declining rotation curves and correlations with optical properties
• Off the baryonic Tully-Fisher relation: a population of baryon-dominated ultra-diffuse galaxies
• A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies
• The Atlas3D project - XXIV. The intrinsic shape distribution of early-type galaxies
• The Arecibo Legacy Fast ALFA Survey: IV. Strategies for Signal Identification and Survey Catalog Reliability
• The SAMI Galaxy Survey: the third and final data release
• Robust HI kinematics of gas-rich ultra-diffuse galaxies: hints of a weak-feedback formation scenario
• LZIFU: an emission-line fitting toolkit for integral field spectroscopy data
• The SAMI Galaxy Survey: Towards a unified dynamical scaling relation for galaxies of all types
• MIGHTEE-HI: The HI emission project of the MeerKAT MIGHTEE survey
• From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully-Fisher relation
• Baryonic Tully-Fisher Relation for Extremely Low Mass Galaxies
• HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
• HI-MaNGA: HI Followup for the MaNGA Survey
• HI-MaNGA: Tracing the physics of the neutral and ionized ISM with the second data release
• xGASS: Cold gas content and quenching in galaxies below the star forming main sequence
• MIGHTEE-HI: The baryonic Tully-Fisher relation over the last billion years
• Origin of the galaxy HI size-mass relation
• WALLABY Pilot Survey: Public release of HI data for almost 600 galaxies from phase 1 of ASKAP pilot observations
• Rotational Widths for Use in the Tully-Fisher Relation. II. The Impact of Surface Brightness
• The SAMI Galaxy Survey: Gas velocity dispersions in low-$z$ star-forming galaxies and the drivers of turbulence
• The baryonic Tully-Fisher relation in the Simba simulation
• The SAMI Galaxy Survey: mass-kinematics scaling relations
• The Tully-Fisher Relation of COLD GASS Galaxies
• The KMOS Galaxy Evolution Survey (KGES): the angular momentum of star-forming galaxies over the last ~10 Gyr
• The SAMI Galaxy Survey: The Low-Redshift Stellar Mass Tully-Fisher Relation
• SH$\alpha$DE: Survey description and mass-kinematics scaling relations for dwarf galaxies
• Evolution of the optical Tully-Fisher relation up to z=1.3
• GHASP: an H$\alpha$ kinematical survey of spiral galaxies -- XIII. Distribution of luminous and dark matter in spiral and irregular nearby galaxies using H$\alpha$ and HI rotation curves and WISE photometry
• Self-consistent bulge/disk/halo galaxy dynamical modeling using integral field kinematics

Cited by in corpus (7)

• A Comparison of the Baryonic Tully-Fisher Relation in MaNGA and IllustrisTNG
• The Tully-Fisher relation from SDSS-MaNGA: Physical causes of scatter and variation at different radii
• Tully-Fisher Relation of Late-type Galaxies at $0.6\le z\le 2.5$
• MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$
• SAMI-HI: the connection between global asymmetry in the ionised and neutral atomic hydrogen gas in galaxies
• Kinematic scaling relations of disc galaxies from ionised gas at $z\sim 1$ and their connection with dark matter haloes
• The circular velocity and halo mass functions of galaxies in the nearby Universe