Dark matter in ALFALFA galaxies: Investigating galaxy-halo connection

Abstract

This paper aims to investigate the galaxy-halo connection using a large sample of individual galaxies with $\mathrm{H}\mathrm{I}$ integrated spectra. We determine their dark matter content by applying a dynamical method based on $\mathrm{H}\mathrm{I}$ line widths measured with the curve-of-growth technique, together with inclination corrections inferred from optical images. We build a sample of 2453 gas-rich predominantly late-type galaxies spanning a stellar mass range of $10^{8.7}{M}_{\odot }$ to $10^{11.4}{M}_{\odot }$ by matching them one-to-one with their counterparts from the ALFALFA survey and the TNG100 simulation, ensuring a direct match of stellar mass and $\mathrm{H}\mathrm{I}$ radius. We generate mock images and mock $\mathrm{H}\mathrm{I}$ integrated spectra for TNG100 galaxies, and apply the same dynamical method to both ALFALFA and TNG100 mock galaxies to infer their dark matter masses. Across all stellar mass bins, ALFALFA galaxies exhibit lower median dark matter masses than the mock TNG100 simulation results. In each bin, this offset is driven by a tail of galaxies with comparatively low dark matter content, which becomes more prominent toward higher stellar masses. In the highest mass bin ($M_{\ast }>10^{11}{M}_{\odot }$), late-type ALFALFA galaxies show a median dark matter mass that is 23% lower than that of their counterparts in the TNG100 dark-matter-only simulation, with 32% of ALFALFA galaxies having $M_{\mathrm{DM}}(<R_{\mathrm{HI}})<10^{11.5}{M}_{\odot }$, compared to 17% in the mock TNG100 sample. These results suggest that a larger fraction of massive late-type galaxies reside in relatively less massive dark matter haloes than predicted by the TNG100 simulation.

12 pages, 12 figures, accepted by A&A

References in corpus (15)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• GALEX-SDSS-WISE Legacy Catalog (GSWLC): Star Formation Rates, Stellar Masses and Dust Attenuations of 700,000 Low-redshift Galaxies
• Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies
• Evolution in the Halo Masses of Isolated Galaxies between z~1 and z~0: From DEEP2 to SDSS
• The stellar-to-halo mass relations of local galaxies segregates by color
• Physical properties underlying observed kinematics of satellite galaxies
• MaNGA DynPop -- I. Quality-assessed stellar dynamical modelling from integral-field spectroscopy of 10K nearby galaxies: a catalogue of masses, mass-to-light ratios, density profiles and dark matter
• The SAMI Galaxy Survey: The internal orbital structure and mass distribution of passive galaxies from triaxial orbit-superposition Schwarzschild models
• On the Determination of Rotation Velocity and Dynamical Mass of Galaxies Based on Integrated H I Spectra
• Measuring Dark Matter in Galaxies: The Mass Fraction Within 5 Effective Radii
• Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics
• Cuspy dark matter density profiles in massive dwarf galaxies
• The GMRT archive atomic gas survey -- II. Mass modelling and dark matter halo properties across late-type spirals
• Globular Cluster Systems and X-Ray Atmospheres in Galaxies