A 5deg x 5deg deep HI survey of the M81 group: II. HI distribution and kinematics of IC 2574 and HIJASS J1021+68

Abstract

We analyse the eastern region of a $5^{\circ }\times 5^{\circ }$ deep HI survey of the M81 group containing the dwarf galaxy IC 2574 and the HI complex HIJASS J1021+68, located between the dwarf and the M81 system. The data show that IC 2574 has an extended HI envelope that connects to HIJASS J1021+68 in the form of a collection of small clouds, but no evident connection has been found between IC 2574 and the central members of the M81 group. We argue, based on the morphology of the clouds forming HIJASS J1021+68 and its velocity distribution, that the complex is not a dark galaxy as previously suggested, but is instead a complex of clouds either stripped from, or falling onto the primordial HI envelope of IC 2574. We also use the deep HI observations to map the extended HI envelope around IC 2574 and, using a 3D tilted-ring model, we derive the rotation curve of the galaxy to a larger extent than has been done before. Combining the obtained rotation curve to higher resolution curves from the literature, we constrain the galaxy's dark matter halo parameters.

arXiv comment15 pages, 17 figures. Accepted for publication in MNRAS

References in corpus (56)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• The Core-Cusp Problem
• The Pan-STARRS1 Surveys
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• Mass Density Profiles of LSB Galaxies
• The dependence of dark matter profiles on the stellar to halo mass ratio: a prediction for cusps vs cores
• Multi-Phase Galaxy Formation: High Velocity Clouds and the Missing Baryon Problem
• Dark and luminous matter in THINGS dwarf galaxies
• The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
• High Velocity Clouds: Building Blocks of the Local Group
• The Magellanic Stream, High-Velocity Clouds and the Sculptor Group
• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• Science With The Australian Square Kilometre Array Pathfinder
• Galaxy And Mass Assembly (GAMA): Mid-Infrared Properties and Empirical Relations from $WISE$
• HI kinematics and dynamics of Messier 31
• Formation of a tidal dwarf galaxy in the interacting system Arp 245 (NGC 2992/93)
• The rotation curves shapes of late-type dwarf galaxies
• The Effelsberg-Bonn HI Survey: Milky Way gas. First data release
• Confirmation of Faint Dwarf Galaxies in the M81 Group
• The DiskMass Survey. VII. The distribution of luminous and dark matter in spiral galaxies
• Holes and Shells in the Interstellar Medium of the Nearby Dwarf Galaxy IC 2574
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• From Tidal Dwarf Galaxies to Satellite Galaxies
• Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822
• The WSRT wide-field HI survey: II. Local Group features
• Discovery of New Dwarf Galaxies in the M81 Group
• A top-down scenario for the formation of massive Tidal Dwarf Galaxies
• Gas dynamics in tidal dwarf galaxies: disc formation at z=0
• Structure and dynamics of giant low surface brightness galaxies
• Neutral Hydrogen Clouds in the M81/M82 Group
• Improved Modeling of the Mass Distribution of Disk Galaxies by the Einasto Halo Model
• A blind HI survey of the M81 group
• Constructing a WISE High Resolution Galaxy Atlas
• The Interacting Dwarf Galaxy NGC 3077: The Interplay of Atomic and Molecular Gas with Violent Star Formation
• Discrete clouds of neutral gas between the galaxies M31 and M33
• Pressure Support in Galaxy Disks: Impact on Rotation Curves and Dark Matter Density Profiles
• ASKAP HI imaging of the galaxy group IC 1459
• Rotation curve fitting and its fatal attraction to cores in realistically simulated galaxy observations
• The 2MASS Tully-Fisher relation for flat edge-on galaxies
• Relics of structure formation: extra-planar gas and high-velocity clouds around the Andromeda Galaxy
• KAT-7 Science Verification: Using HI Observations of NGC 3109 to Understand its Kinematics and Mass Distribution
• Green Bank Telescope observations of low column density HI around NGC 2997 and NGC 6946
• The WSRT wide-field HI survey: I. The background galaxy sample
• Gas and dark matter in the Sculptor group: NGC 55
• The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups
• Asymmetric mass models of disk galaxies - I. Messier 99
• Early Observations of the MHONGOOSE Galaxies: Getting Ready for MeerKAT
• A 5deg x 5deg deep HI survey of the M81 group
• Rotation curves of galaxies and the stellar mass-to-light ratio

Cited by in corpus (3)

• A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).X. Formation of a red ultra-diffuse galaxy and an almost dark galaxy during a ram-pressure stripping event
• Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback
• MIGHTEE-\HI: Possible interactions with the galaxy NGC~895