Merger-induced Shocks in the Nearby LIRG VV 114 through Methanol Observations with ALMA

Abstract

We report the detection of two CH${}_3$OH lines (J${}_K$ = 2${}_K$-1${}_K$ and 3${}_K$-2${}_K$) between the progenitor's disks ("Overlap") of the mid-stage merging galaxy VV 114 obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) Band 3 and Band 4. The detected CH${}_3$OH emission show an extended filamentary structure (~ 3 kpc) across the progenitor's disks with relatively large velocity width (FWZI ~ 150 km/s). The emission is only significant in the "overlap" and not detected in the two merging nuclei. Assuming optically-thin emission and local thermodynamic equilibrium (LTE), we found the CH${}_3$OH column density relative to H${}_2$ ($X_{\mathrm{C}{\mathrm{H}}_3\mathrm{OH}}$) peaks at the "Overlap" (~ 8 $\times$ 10${}^{-9}$), which is almost an order of magnitude larger than that at the eastern nucleus. We suggest that kpc-scale shocks driven by galaxy-galaxy collision may play an important role to enhance the CH${}_3$OH abundance at the "Overlap". This scenario is consistent with that shock-induced large velocity dispersion components of ionized gas have been detected in optical wavelength at the same region. Conversely, low $X_{\mathrm{C}{\mathrm{H}}_3\mathrm{OH}}$ at the nuclear regions might be attributed to the strong photodissociation by nuclear starbursts and/or putative active galactic nucleus (AGN), or inefficient production of CH${}_3$OH on dust grains due to initial high temperature conditions (i.e., desorption of the precursor molecule, CO, into gas-phase before forming CH${}_3$OH on dust grains). These ALMA observations demonstrate that CH${}_3$OH is a unique tool to address kpc-scale shock-induced gas dynamics and star formation in merging galaxies.

arXiv comment8 pages, 4 figures, 3 tables, accepted for publication in ApJ

References in corpus (40)

• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• How to Calculate Molecular Column Density
• GOALS: The Great Observatories All-Sky LIRG Survey
• NICMOS Imaging of Infrared-Luminous Galaxies
• The driving mechanism of starbursts in galaxy mergers
• Galaxy-Wide Shocks in Late-Merger Stage Luminous Infrared Galaxies
• A 2 mm spectral line survey of the starburst galaxy NGC 253
• Spatially Resolved Chemistry in Nearby Galaxies I. The Center of IC 342
• Far-Infrared Galaxies in the Far-Ultraviolet
• Radio-to-FIR Spectral Energy Distribution and Photometric Redshifts for Dusty Starburst Galaxies
• Luminous Infrared Galaxies with the Submillimeter Array: I. Survey Overview and the Central Gas to Dust Ratio
• Molecules as tracers of galaxy evolution: an EMIR survey. I. Presentation of the data and first results
• Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies
• Explosive Outflows Powered by the Decay of Non-Hierarchical Multiple Systems of Massive Stars: Orion BN/KL
• Lambda = 3 mm line survey of nearby active galaxies
• Molecular gas chemistry in AGN. II. High-resolution imaging of SiO emission in NGC1068: shocks or XDR?
• The Submillimeter Array 1.3 mm line survey of Arp 220
• A lambda = 1.3 mm and 2 mm molecular line survey towards M82
• L1157-B1: Water and ammonia as diagnostics of shock temperature
• Spectral imaging of the Sagittarius B2 region in multiple 3-mm molecular lines with the Mopra telescope
• Exploring the molecular chemistry and excitation in obscured luminous infrared galaxies: An ALMA mm-wave spectral scan of NGC 4418
• Spatially Resolved Chemistry in Nearby Galaxies II. The Nuclear Bar in Maffei 2
• Far-Ultraviolet & X-ray Observations of VV 114: Feedback in a Local Analog to Lyman Break Galaxies
• Distributions of molecules in the circumnuclear disk and surrounding starburst ring in the Seyfert galaxy NGC 1068 observed with ALMA
• Photodissociation chemistry footprints in the Starburst galaxy NGC 253
• Spectral Line Survey toward Spiral Arm of M51 in the 3 mm and 2 mm Bands
• Large-scale molecular shocks in galaxies: the SiO interferometer map of IC342
• ALMA Multi-line Observations of the IR-bright Merger VV 114
• High Density Molecular Gas in the IR-bright Galaxy System VV114
• Submillimeter Imaging of the Luminous Infrared Galaxy Pair VV 114
• A Multi-Transition Study of Molecules toward NGC 1068 based on High-Resolution Imaging Observations with ALMA
• Methanol detection in M82
• ALMA CO and VLT/SINFONI H2 observations of the Antennae overlap region: mass and energy dissipation
• Luminous Infrared Galaxies With the Submillimeter Array. IV. 12CO J=6-5 Observations of VV 114
• Active Galactic Nucleus and Extended Starbursts in a Mid-stage Merger VV114
• Spectral Line Survey toward Young Massive Protostar NGC 2264 CMM3 in the 4 mm, 3 mm, and 0.8 mm Bands
• Ground-based Pa$\alpha$ Narrow-band Imaging of Local Luminous Infrared Galaxies I: Star Formation Rates and Surface Densities
• Spatially Resolved Chemistry in Nearby Galaxies III. Dense Molecular Gas in the Inner Disk of the LIRG IRAS 04296+2923
• Spatially-resolved Radio-to-Far-infrared SED of the Luminous Merger Remnant NGC 1614 with ALMA and VLA
• The molecular ISM in luminous infrared galaxies: a 3mm line survey of Arp 157

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