Complex distribution and velocity field of molecular gas in NGC 1316 as revealed by Morita Array of ALMA

Abstract

We present the results of ${}^{12}$CO($J$=1-0) mosaicing observations of the cD galaxy NGC 1316 at kpc-resolution performed with the Morita Array of the Atacama Large Millimeter/submillimeter Array (ALMA). We reveal the detailed distribution of the molecular gas in the central region for the first time: a shell structure in the northwest, a barely resolved blob in the southeast of the center and some clumps between them. The total molecular gas mass obtained with a standard Milky-Way CO-to-H${}_2$ conversion factor is $(5.62\pm 0.53)\times 10^8$ M${}_{\odot }$, which is consistent with previous studies. The disturbed velocity field of the molecular gas suggests that the molecular gas is injected very recently ($<1$ Gyr) if it has an external origin and is in the process of settling into a rotating disk. Assuming that a low-mass gas-rich galaxy has accreted, the gas-to-dust ratio and H${}_2$-to-HI ratio are unusually low ($\sim 28$) and high ($\sim 5.6$), respectively. To explain these ratios, additional processes should be taken into accounts such as an effective dust formation and conversion from atomic to molecular gas during the interaction. We also discuss the interaction between the nuclear jet and the molecular gas.

arXiv comment16 pages, 8 figures, 3 tables, accepted for publication in PASJ

References in corpus (69)

• Galactic Stellar and Substellar Initial Mass Function
• On the variation of the Initial Mass Function
• Star Formation in Galaxies Along the Hubble Sequence
• The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
• Star Formation in the Milky Way and Nearby Galaxies
• Observational Evidence of AGN Feedback
• The CO-to-H2 Conversion Factor
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• SINGS: The SIRTF Nearby Galaxies Survey
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample
• The Mid-Infrared Spectrum of Star-Forming Galaxies: Global Properties of PAH Emission
• Massive Molecular Outflows and Evidence for AGN Feedback from CO Observations
• Gas-to-Dust mass ratios in local galaxies over a 2 dex metallicity range
• The stellar mass assembly of galaxies in the Illustris simulation: growth by mergers and the spatial distribution of accreted stars
• Molecular line emission in NGC1068 imaged with ALMA. I An AGN-driven outflow in the dense molecular gas
• A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
• The Recent and Continuing Assembly of Field Ellipticals by Red Mergers
• The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images
• Discovery of an AGN-Driven Molecular Outflow in the Local Early-Type Galaxy NGC 1266
• SoFiA: a flexible source finder for 3D spectral line data
• Substructure and dynamics of the Fornax Cluster
• Rapid formation of large dust grains in the luminous supernova SN 2010jl
• ALMA observations of feeding and feedback in nearby Seyfert galaxies: an AGN-driven outflow in NGC 1433
• Warm molecular hydrogen in the Spitzer SINGS galaxy sample
• Mapping the cold dust temperatures and masses of nearby Kingfish galaxies with Herschel
• H2 formation and excitation in the diffuse interstellar medium
• Galactic star formation enhanced and quenched by ram pressure in groups and clusters
• Kinematics, ages, and metallicities of star clusters in NGC 1316: A 3 Gyr old merger remnant
• Chandra X-ray Observations of NGC 1316 (Fornax A)
• Dusty Nuclear Disks and Filaments in Early Type Galaxies
• The Atlas3D project -- XXVII. Cold Gas and the Colours and Ages of Early-type Galaxies
• Low-Metallicity Star Formation : Prestellar Collapse and Protostellar Accretion in the Spherical Symmetry
• ALLSMOG: an APEX Low-redshift Legacy Survey for MOlecular Gas. I - molecular gas scaling relations, and the effect of the CO/H2 conversion factor
• The star cluster system of the 3 Gyr old merger remnant NGC 1316: Clues from optical and near-infrared photometry
• Coevolution of dust, gas, and stars in galaxies - I. Spatial distributions and scaling-relations of dust and molecular hydrogen
• The stellar dynamics and mass of NGC 1316 using the radial velocities of planetary nebulae
• The Fornax Deep Survey with VST. II. Fornax A: a two-phase assembly caught on act
• Dust emission in early-type galaxies: The mid-infrared view
• Inferring physical conditions in interstellar clouds of H_2
• HST Imaging of the Globular Clusters in the Fornax Cluster: Color and Luminosity Distributions
• Molecular and atomic gas in dust lane early-type galaxies - I: Low star-formation efficiencies in minor merger remnants
• The AGN fuelling/feedback cycle in nearby radio galaxies - I. ALMA observations and early results
• On the depletion and accretion timescales of cold gas in local early-type galaxies
• Atomic and molecular gas in the merger galaxy NGC 1316 (Fornax A) and its environment
• The Cocoon Shocks of Cygnus A: Pressures and Their Implications for the Jets and Lobes
• Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes
• S0 galaxies in Fornax: data and kinematics
• The selective effect of environment on the atomic and molecular gas-to-dust ratio of nearby galaxies in the Herschel Reference Survey
• Constraining the Outburst Properties of the SMBH in Fornax A through X-ray, Infrared, and Radio Observations
• Dissecting the origin of the submillimeter emission in nearby galaxies with Herschel and LABOCA
• The gas-to-dust mass ratio of Centaurus A as seen by Herschel
• The Declined Activity in the Nucleus of NGC 1316
• Rosat X-ray Observations of the Radio Galaxy NGC 1316 (Fornax A)
• The distance to NGC1316 (Fornax A): yet another curious case
• The Ages of Elliptical Galaxies from Mid-Infrared Emission
• Disentangling the circumnuclear environs of Centaurus A: I. High resolution molecular gas imaging
• Hard X-Ray Spectrum from West Lobe of Radio Galaxy Fornax A Observed with Suzaku
• HST images of B2 radio galaxies: a link between circum-nuclear dust and radio properties?
• Environmental Effects on Gaseous Disks of the Virgo Spiral Galaxies
• The complex star cluster system of NGC 1316 (Fornax A)
• X-ray measurements of the field and particle energy distributions in the west lobe of the radio galaxy NGC 1316 (Fornax A)
• Properties of Molecular Gas in Galaxies in Early and Mid Stage of Interaction: II. Molecular Gas Fraction
• Hubble Space Telescope Planetary Camera Images of NGC 1316
• Mid-infrared dust in two nearby radio galaxies, NGC 1316 (Fornax A) and NGC 612 (PKS 0131-36)
• Mass and size growth of early-type galaxies by dry mergers in cluster environments
• Formation and evolution of molecular hydrogen in disk galaxies with different masses and Hubble types
• Dark mammoth trunks in the merging galaxy NGC 1316 and a mechanism of cosmic double helices
• Suzaku Detection of Thermal X-Ray Emission Associated with the Western Radio Lobe of Fornax A

Cited by in corpus (12)

• AGN feeding and feedback in Fornax A: kinematical analysis of the multi-phase ISM
• The flickering nuclear activity of Fornax A
• A spectroscopic census of the Fornax cluster and beyond: preparing for next generation surveys
• A MeerKAT view of pre-processing in the Fornax A group
• VLA Radio Study of a Sample of Nearby X-ray and Optically Bright Early-Type Galaxies
• CO($J$=1-0) mapping survey of 64 galaxies in the Fornax cluster with the ALMA Morita array
• AlFoCS + F3D II: unexpectedly low gas-to-dust ratios in the Fornax galaxy cluster
• The AGN fuelling/feedback cycle in nearby radio galaxies - V. The cold atomic gas of NGC 3100 and its group
• The S-PLUS Fornax Project (S+FP): Mapping H$\alpha$+[NII] emission in 77 Fornax galaxy members reaching $\sim$4 Rvir
• Dust and gas in the central region of NGC 1316 (Fornax A) -- Its origin and nature
• Imaging and photometric studies of NGC 1316 (Fornax A) using Astrosat/UVIT
• The recurrent nuclear activity of Fornax A and its interaction with the cold gas