Dark Matter in the Central Region of the Spiral Galaxy NGC 4321

Abstract

We present our results of 12 CO(1-0) transition in the central region of NGC 4321 using the Atacama Large Millimeter and Sub-millimeter Array (ALMA). We found an unaccounted mass of $2.3\times 10^9{M}_{\odot }$ within the central 0.7 kpc of this galaxy. The expected mass of the supermassive black hole (SMBH) in this galaxy is much smaller than the unaccounted mass. The invisible mass is likely caused by dark matter in the central region of the galaxy, indicating a cuspy dark matter profile. We also investigated the Modified Newtonian Dynamics (MOND) as an alternative mechanism to explain the invisible mass. We noted that at the radius of 0.7 kpc of the galaxy, the acceleration is about $1.04\times 10^{-}7cm{s}^{-}2$, which is much larger than the critical acceleration $a_0\sim 1.2\times 10^{-}8cm{s}^{-}2$ in the MOND theory, suggesting that theory might not be able explain the unseen mass problem in central region of this galaxy.

arXiv comment18 pages, 6 figures. arXiv admin note: text overlap with arXiv:1810.00374

References in corpus (19)

• Relativistic gravitation theory for the MOND paradigm
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• The CO-to-H2 Conversion Factor and Dust-to-Gas Ratio on Kiloparsec Scales in Nearby Galaxies
• Reconstructing the stellar mass distributions of galaxies using S4G IRAC 3.6 and 4.5 micron images: II. The conversion from light to mass
• The Spitzer Survey of Stellar Structure in Galaxies (S${}^4$G): Precise Stellar Mass Distributions from Automated Dust Correction at 3.6 microns
• Radial distribution of stars, gas and dust in SINGS galaxies. II. Derived dust properties
• The HI Halo of NGC 891
• Resolving the virial discrepancy in clusters of galaxies with modified Newtonian dynamics
• The Global Star Formation Laws of Galaxies from a Radio Continuum Perspective
• Kinematics of ionized and molecular hydrogen in the core of M100
• MOND rotation curves for spiral galaxies with Cepheid-based distances
• Star formation laws in the Andromeda galaxy: gas, stars, metals and the surface density of star formation
• Using globular clusters to test gravity in the weak acceleration regime
• Statistical properties of HII regions in the disc of M100
• Molecular Superbubbles and Outflows from Starburst Galaxy NGC 2146
• Testing modified Newtonian dynamics in the Milky Way
• Differences between CO- and calcium triplet-derived velocity dispersions in spiral galaxies: evidence for central star formation?
• Dark Matter: The evidence from astronomy, astrophysics and cosmology
• Non-circular motion evidences in the circumnuclear region of M100 (NGC 4321)

Cited by in corpus (1)

• A comprehensive analysis using 9 dark matter halo models on the spiral galaxy NGC 4321