The impact of gas disc flaring on rotation curve decomposition and revisiting baryonic and dark-matter relations for nearby galaxies

Abstract

Gas discs of late-type galaxies are flared, with scale heights increasing with the distance from the galaxy centres and often reaching kpc scales. We study the effects of gas disc flaring on the recovered dark matter halo parameters from rotation curve decomposition. For this, we carefully select a sample of 32 dwarf and spiral galaxies with high-quality neutral gas, molecular gas, and stellar mass profiles, robust H\,{\sc i} rotation curves obtained via 3D kinematic modelling, and reliable bulge-disc decomposition. By assuming vertical hydrostatic equilibrium, we derive the scale heights of the atomic and molecular gas discs and fit dark matter haloes to the rotation curves self-consistently. We find that the effect of the gas flaring in the rotation curve decomposition can play an important role only for the smallest, gas-dominated dwarfs, while for most of the galaxies the effect is minor and can be ignored. We revisit the stellar- and baryon-to-halo mass relations ($M_{\ast }-M_{200}$ and $M_{\mathrm{bar}}-M_{200}$). Both relations increase smoothly up to $M_{200}\approx 10^{12}{\mathrm{M}}_{\odot }$, with galaxies at this end having high $M_{\ast }/M_{200}$ and $M_{\mathrm{bar}}/M_{200}$ ratios approaching the cosmological baryon fraction. At higher $M_{200}$ the relations show a larger scatter. Most haloes of our galaxy sample closely follow the concentration-mass ($c_{200}-M_{200}$) relation resulting from N-body cosmological simulations. Interestingly, the galaxies deviating above and below the relation have the highest and lowest stellar and baryon factions, respectively, which suggests that the departures from the $c_{200}-M_{200}$ law are regulated by adiabatic contraction and an increasing importance of feedback.

accepted for publication in MNRAS. Supplementary material will be available from MNRAS and meantime at this link: https://www.dropbox.com/sh/768phag6ttgym0j/AABZwerBgFofkkZ5npHW17YBa

References in corpus (32)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• HyperLEDA. III. The catalogue of extragalactic distances
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• The cold gaseous halo of NGC 891
• Color--Mass-to-Light Ratio Relations for Disk Galaxies
• The stellar mass-halo mass relation of isolated field dwarfs: a critical test of $\Lambda$CDM at the edge of galaxy formation
• PHANGS-ALMA Data Processing and Pipeline
• The impact of mechanical AGN feedback on the formation of massive early-type galaxies
• A comprehensive catalog of dark matter halo models for SPARC galaxies
• LITTLE THINGS in 3D: robust determination of the circular velocity of dwarf irregular galaxies
• The stellar-to-halo mass relations of local galaxies segregates by color
• Early flattening of dark matter cusps in dwarf spheroidal galaxies
• From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully-Fisher relation
• Radial motions and radial gas flows in local spiral galaxies
• The Interstellar Medium and Star Formation in Edge-On Galaxies. II. NGC 4157, 4565, and 5907
• Evidence for supernova feedback sustaining gas turbulence in nearby star-forming galaxies
• VERTICO: The Virgo Environment Traced In CO Survey
• The baryonic specific angular momentum of disc galaxies
• Distribution and kinematics of atomic and molecular gas inside the Solar circle
• Dynamical evidence for a morphology-dependent relation between the stellar and halo masses of galaxies
• From lenticulars to blue compact dwarfs: the stellar mass fraction is regulated by disc gravitational instability
• Detailed HI kinematics of Tully-Fisher calibrator galaxies
• Baryonic Imprints on DM Halos: Population Statistics from Dwarf Galaxies to Galaxy Clusters
• A universal relation between the properties of supermassive black holes, galaxies, and dark matter halos
• The volumetric star formation law for nearby galaxies -- Extension to dwarf galaxies and low-density regions
• The volumetric star formation law in the Milky Way
• Molecular scale height in spiral galaxies
• The impact of baryonic physics on the abundance, clustering, and concentration of halos
• The galaxy HI-(sub)halo connection and the HI spatial clustering of local galaxies
• Introduction to Galaxy Formation and Evolution. From Primordial Gas to Present-Day Galaxies
• Relationships between the Stellar, Gaseous, and Star Formation Disks in LITTLE THINGS Dwarf Irregular Galaxies: Indirect Evidence for Substantial Fractions of Dark Molecular Gas
• The impact of the halo spin-concentration relation on disc scaling laws

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