NGC6240: Merger-Induced Star Formation & Gas Dynamics

Abstract

We present spatially resolved integral field spectroscopic K-band data at a resolution of 0.13" (60pc) and interferometric CO(2-1) line observations of the prototypical merging system NGC6240. Despite the clear rotational signature, the stellar kinematics in the two nuclei are dominated by dispersion. We use Jeans modelling to derive the masses and the mass-to-light ratios of the nuclei. Combining the luminosities with the spatially resolved Br-gamma equivalent width shows that only 1/3 of the K-band continuum from the nuclei is associated with the most recent star forming episode; and that less than 30% of the system's bolometric luminosity and only 9% of its stellar mass is due to this starburst. The star formation properties, calculated from typical merger star formation histories, demonstrate the impact of different assumptions about the star formation history. The properties of the nuclei, and the existence of a prominent old stellar population, indicate that the nuclei are remnants of the progenitor galaxies' bulges.

18 pages, 14 figures. Accepted for publication in A&A

References in corpus (98)

• The cosmological simulation code GADGET-2
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The slope of the black-hole mass versus velocity dispersion correlation
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Modeling feedback from stars and black holes in galaxy mergers
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity
• Gasdynamics and Starbursts in Major Mergers
• On the Black Hole Mass - Bulge Mass Relation
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• A Redshift Survey of the Submillimeter Galaxy Population
• What Powers Ultra-luminous IRAS Galaxies?
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• On the Maximum Luminosity of Galaxies and Their Central Black Holes: Feedback From Momentum-Driven Winds
• The Molecular Interstellar Medium in Ultraluminous Infrared Galaxies
• The Relationship Between Stellar Light Distributions of Galaxies and their Formation Histories
• AGN Black Hole Masses and Bolometric Luminosities
• Submillimeter Galaxies at z~2: Evidence for Major Mergers & Constraints on Lifetimes, IMF and CO-H2 Conversion Factor
• Accurate masses for dispersion-supported galaxies
• Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra
• From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
• Kinemetry: a generalisation of photometry to the higher moments of the line-of-sight velocity distribution
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• A Merger-Driven Scenario for Cosmological Disk Galaxy Formation
• The effect of galaxy mass ratio on merger--driven starbursts
• Star formation efficiency in galaxy interactions and mergers: a statistical study
• A Close Look at Star Formation around Active Galactic Nuclei
• Statistical Properties of Collisionless Equal- and Unequal-Mass Merger Remnants of Disk Galaxies
• Energy Input and Mass Redistribution by Supernovae in the Interstellar Medium
• The nature of faint submm-selected galaxies
• A median redshift of 2.4 for galaxies bright at submillimetre wavelengths
• Optical and Near-Infrared Imaging of the IRAS 1-Jy Sample of Ultraluminous Infrared Galaxies: II. The Analysis
• Formation of gas disks in merging galaxies
• Feedback in simulations of disc-galaxy major mergers
• Inclination- and dust-corrected galaxy parameters: Bulge-to-disc ratios and size-luminosity relations
• The SINS survey: modeling the dynamics of z~2 galaxies and the high-z Tully-Fisher relation
• On the frequency, intensity and duration of starburst episodes triggered by galaxy interactions and mergers
• The driving mechanism of starbursts in galaxy mergers
• The influence of gas on the structure of merger remnants
• Dust covering factor, silicate emission and star formation in luminous QSOs
• Ultra-Luminous Infrared Mergers: Elliptical Galaxies in Formation?
• Orbital Parameters of Merging Dark Matter Halos
• The Nearly Universal Merger Rate of Dark Matter Haloes in Lambda-CDM Cosmology
• Equal- and unequal-mass mergers of disk and elliptical galaxies with black holes
• The SAURON project - VII. Integral-field absorption and emission-line kinematics of 24 spiral galaxy bulges
• Dynamical Modeling of NGC 7252 and the Return of Tidal Material
• A method to remove residual OH emission from near infrared spectra
• The Star-Forming Torus and Stellar Dynamical Black Hole Mass in the Seyfert 1 Nucleus of NGC3227
• Ionizing Photon Emission Rates from O- and Early B-type Stars and Clusters
• Near-Infrared and Star-forming properties of Local Luminous Infrared Galaxies
• Molecular gas in extreme star-forming environments: the starbursts Arp220 and NGC6240 as case studies
• Cosmic Evolution of Mass Accretion Rate and Metalicity in Active Galactic Nuclei
• Mid-Infrared Spectroscopy of Submillimeter Galaxies: Extended Star Formation in Massive High Redshift Galaxies
• The Hubble Deep Field North SCUBA Super-map III - Optical and near-infrared properties of submillimetre galaxies
• Dynamical properties of Ultraluminous Infrared Galaxies I: Mass ratio conditions for ULIRG activity in interacting pairs
• The Nature of Starburst Activity in M82
• Gas Dynamics in the Luminous Merger NGC 6240
• The central parsecs of Centaurus A: High Excitation Gas, a Molecular Disk, and the Mass of the Black Hole
• High-resolution simulations of galaxy mergers: Resolving globular cluster formation
• Do dwarf galaxies form in tidal tails?
• Mapping stationary axisymmetric phase-space distribution functions by orbit libraries
• Dynamical properties of Ultraluminous Infrared Galaxies. II. Traces of dynamical evolution and end products of local ultraluminous mergers
• The mass of the black hole in Centaurus A from SINFONI AO-assisted integral-field observations of stellar kinematics
• CN and HCN in Dense Interstellar Clouds
• Detection of the Buried AGN in NGC 6240 with the Infrared Spectrograph on The Spitzer Space Telescope
• The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
• SINFONI adaptive optics integral field spectroscopy of the Circinus Galaxy
• The Initial Mass Functions in the Super-Star-Clusters NGC 1569A and NGC 1705-1
• Stellar Dynamics and the implications on the merger evolution in NGC6240
• ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240
• The Gemini spectral library of near-IR late type stellar templates and its application for velocity dispersion measurements
• From Globular Clusters to Tidal Dwarfs: Structure Formation in the Tidal Tails of Merging Galaxies
• Gemini Near Infrared Spectrograph observations of the central supermassive black hole in Centaurus A
• One moment in time - modeling star formation in the Antennae
• Parsec-Scale Radio Structure of the Double Active Nucleus of NGC 6240
• Moderate resolution near-infrared spectroscopy of cool stars: a new K-band library
• Molecular Hydrogen Excitation in Ultraluminous Infrared Galaxies
• The Core of NGC 6240 from Keck Adaptive Optics and HST NICMOS Observations
• Molecular Hydrogen Excitation around Active Galactic Nuclei
• The Radio Emission from the Ultra-Luminous Far-Infrared Galaxy NGC 6240
• Kinematic deprojection and mass inversion of spherical systems of known velocity anisotropy
• Spitzer-IRS Study of the Antennae Galaxies NGC 4038/39
• A Molecular Gas Bridge between the Taffy Galaxies
• Exact solutions for the spatial de Vaucouleurs and Sersic laws and related quantities
• Hubble Space Telescope Observations of NGC 6240: a Case Study of an Ultra-Luminous Infrared Galaxy with Obscured Activity
• Dust and the Infrared Kinematic Properties of Early-Type Galaxies
• VLT Diffraction Limited Imaging and Spectroscopy in the NIR: Weighing the black hole in Centaurus A with NACO
• XMM-Newton Spectroscopy of the Starburst Dominated Ultra Luminous Infrared Galaxy NGC 6240
• The Global Star Formation Rate from the 1.4 GHz Luminosity Function
• RXTE observation of NGC 6240: a search for the obscured active nucleus
• On the formation of star clusters in the merger NGC 6240
• Dynamical Models of Elliptical Galaxies in z=0.5 Clusters: I. Data-Model Comparison and Evolution of Galaxy Rotation
• Superwind-driven Intense H${}_2$ Emission in NGC 6240 II: Detailed Comparison of Kinematical and Morphological Structures of the Warm and Cold Molecular Gas
• Circumnuclear Star Clusters in the Galaxy Merger NGC 6240, Observed with Keck Adaptive Optics and HST
• The Merging System Am 2049-691

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• Mass of the Southern Black Hole in NGC 6240 from Laser Guide Star Adaptive Optics
• The Exceptional Soft X-ray Halo of the Galaxy Merger NGC 6240
• Two Separate Outflows in the Dual Supermassive Black Hole System NGC 6240
• Giant H$\alpha$ nebula surrounding the starburst merger NGC 6240
• Stellar Velocity Dispersion in Dissipative Galaxy Mergers with Star Formation
• MICONIC: Dual active galactic nuclei, star formation, and ionised gas outflows in NGC 6240 seen with MIRI/JWST
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• NGC 6240 Supermassive Black Hole Binary dynamical evolution based on Chandra data
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• Constrained simulations of the Antennae Galaxies: Comparison with Herschel-PACS observations
• Merging timescale for supermassive black hole binary in interacting galaxy NGC 6240
• Tracing the Ionization Structure of the Shocked Filaments of NGC 6240
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• The origin of the near-IR line emission from molecular, low and high ionization gas in the inner kiloparsec of NGC6240
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• Metallicity in the merger Seyfert galaxy NGC 6240
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• Dynamical evolution timescales for the triple supermassive black hole system in NGC 6240
• Outflowing shocked gas dominates the NIR H${}_2$ emission from the dual AGN NGC6240
• ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies