Arp 220: New Observational Insights into the Structure and Kinematics of the Nuclear Molecular Disks and Surrounding Gas

Abstract

ALMA cycle 3 observations of ${}^{12}$CO $J=3\to 2$, ${}^{13}$CO $J=4\to 3$, SiO J = $8\to 7$, and HCN J = $5\to 4$ are presented. Significant extended emission is detected in ${}^{12}$CO J $=3\to 2$ with a morphology that is indicative of m = 2 tidal features, suggesting gas inflow. In addition, outflow for both nuclei are found in the ${}^{12}$CO J $=3\to 2$. Significant SiO absorption is detected in the western nucleus. HCN that is morphologically distinct from CO is detected in both nuclei. These observations are compared to non-LTE radiative transfer models created using the Line Modeling Engine (LIME) for simple gas dynamics to gain insight into how physical parameters, such as rotational velocity, turbulent velocity, gas temperature, dust temperature, and gas mass can reproduce the observed kinematic and spatial features. The eastern nucleus is found to be best modeled with an inclusion of a temperature asymmetry from one side of the disk to the other. It is also found that the western nucleus is optically thick even in the less abundant species of ${}^{13}$CO, absorbing significant amounts of continuum radiation.

References in corpus (10)

• Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
• VLBI Images of 49 Radio Supernovae in Arp 220
• SMA Imaging of CO(3-2) Line and 860 micron Continuum of Arp 220 : Tracing the Spatial Distribution of Luminosity
• Vibrationally Excited HCN in the Luminous Infrared Galaxy NGC 4418
• P-Cygni Profiles of Molecular Lines toward Arp 220 Nuclei
• Overluminous HNC Line Emission in Arp220, NGC4418 and Mrk231 - Global IR Pumping or XDRs?
• High-Resolution Radio Continuum Measurements of the Nuclear Disks of Arp 220
• Extreme dust disks in Arp 220 as revealed by ALMA
• The hidden heart of the luminous infrared galaxy IC 860 I. A molecular inflow feeding opaque, extreme nuclear activity
• Resolved Structure of Arp 220 Nuclei at λ~3 mm

Cited by in corpus (15)

• MUSE view of Arp220: Kpc-scale multi-phase outflow and evidence for positive feedback
• Changing-look active galactic nuclei: close binaries of supermassive black holes in action
• No evidence of AGN features in the nuclei of Arp 220 from JWST/NIRSpec IFS
• Deeply Buried Nuclei in the Infrared-Luminous Galaxies NGC 4418 and Arp 220: I. ALMA Observations at $\lambda =$1.4-0.4 mm and Continuum Analysis
• Dust masses, compositions, and luminosities in the nuclear disks and the diffuse circumnuclear medium of Arp220
• JWST/NIRSpec insights into the circumnuclear region of Arp 220: A detailed kinematic study
• Arp 220: A Post-Starburst Galaxy With Little Star Formation Outside of It's Nuclear Disks
• A Comparison of Star-Forming Clumps and Tidal Tails in Local Mergers and High Redshift Galaxies
• Extremely Buried Nucleus of IRAS 17208$-$0014 Observed at Sub-Millimeter and Near-Infrared Wavelengths
• Spatially-resolved relation between [CI] ${}^3{P}_1$-${}^3{P}_0$ and ${}^{12}$CO (1-0) in Arp 220
• Molecular Gas in the Nuclear Region of NGC 6240
• The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk
• The OH Megamaser Emission in Arp\,220: the rest of the story
• HCN (1-0) opacity of outflowing gas in Arp 220W
• The magnetic fields of the dusty nuclei and molecular outflows of Arp 220