Energetic nuclear transients in luminous and ultraluminous infrared galaxies

Abstract

Energetic nuclear outbursts have been discovered in luminous and ultraluminous infrared galaxies (U/LIRGs) at unexpectedly high rates. To investigate this population of transients, we performed a search in mid-IR data from the Wide-field Infrared Survey Explorer (WISE) satellite and its NEOWISE survey to detect and characterise luminous and smoothly evolving transients in a sample of 215 U/LIRGs. We report three new transients, all with $\Delta L>10^{43}$ erg s${}^{-1}$, in addition to two previously known cases. Their host galaxies are all part of major galaxy mergers, and through radiative transfer model fitting we find that all have a significant contribution from an active galactic nucleus (AGN). We characterised the transients through measurements of their luminosities and resulting energetics, all of which are between 10${}^{50.9}$ erg and 10${}^{52.2}$ erg. The IR emission of the five transients was found to be consistent with re-radiation by the hot dust of emission at shorter wavelengths, presumably originating from an accretion event, onto the supermassive black hole. The corresponding transient rate of (1.6-4.6)$\times$10${}^{-3}$ / yr / galaxy is over an order of magnitude higher than the rate of large amplitude flares shown by AGN in the optical. We suggest that the observed transients are part of a dust-obscured population of tidal disruption events (TDEs) that have remained out of the reach of optical surveys due to the obscuring dust. In one case, this is supported by our radio observations. We also discuss other plausible explanations. The observed rate of events is significantly higher than optical TDE rates, which can be expected in U/LIRG hosts undergoing a major galaxy merger with increased stellar densities in the nuclear regions. Continued searches for such transients and their multi-wavelength follow-up is required to constrain their rate and nature.

arXiv comment15 pages; 8 figures, published by A&A. Re-uploaded to reflect published version. Main changes from previous version are expanded radio analysis and slightly altered rate due to additional year of NEOWISE data

References in corpus (86)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Stellar population synthesis at the resolution of 2003
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The slope of the black-hole mass versus velocity dispersion correlation
• The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity
• First Results from the Catalina Real-time Transient Survey
• The IRAS Revised Bright Galaxy Sample (RBGS)
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• Initial Performance of the NEOWISE Reactivation Mission
• A relativistic jetted outburst from a massive black hole fed by a tidally disrupted star
• The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
• A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
• Tidal Disruption Events
• The Birth of a Relativistic Outflow in the Unusual γ-ray Transient Swift J164449.3+573451
• Optical and Near-Infrared Imaging of the IRAS 1-Jy Sample of Ultraluminous Infrared Galaxies: II. The Analysis
• Seventeen Tidal Disruption Events from the First Half of ZTF Survey Observations: Entering a New Era of Population Studies
• A Systematic Search for Changing-Look Quasars in SDSS
• CASSIS: The Cornell Atlas of Spitzer/IRS Sources
• The Rapid ASKAP Continuum Survey I: Design and First Results
• High Density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The first 1100 days
• Massive Star Formation in Galaxies: Radiative transfer models of the UV to mm emission of starburst galaxies
• The Superluminous Transient ASASSN-15lh as a Tidal Disruption Event from a Kerr Black Hole
• Reverberation Measurements of the Inner Radius of the Dust Torus in 17 Seyfert Galaxies
• Discovery of an outflow from radio observations of the tidal disruption event ASASSN-14li
• Radio Properties of Tidal Disruption Events
• Tidal disruption rate of stars by spinning supermassive black holes
• Optical-Ultraviolet Tidal Disruption Events
• A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger
• Changing-Look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars
• On the mass and luminosity functions of tidal disruption flares: rate suppression due to black hole event horizons
• Mid-infrared variability of changing-look AGN
• Dynamical properties of Ultraluminous Infrared Galaxies. II. Traces of dynamical evolution and end products of local ultraluminous mergers
• Core-collapse supernovae missed by optical surveys
• The Host Galaxies of Tidal Disruption Events
• The Nuclear Structure in Nearby Luminous Infrared Galaxies: HST NICMOS Imaging of the GOALS Sample
• Cirrus models for local and high z SCUBA galaxies
• Discovery of transient infrared emission from dust heated by stellar tidal disruption flares
• A new class of flares from accreting supermassive black holes
• Tidal disruption events in active galactic nuclei
• TDE Hosts are Green and Centrally Concentrated: Signatures of a Post-Merger System
• Infrared Echoes of Optical Tidal Disruption Events: ~1% Dust Covering Factor or Less at sub-parsec Scale
• A population of highly energetic transient events in the centres of active galaxies
• Mid-InfraRed Outburst in Nearby Galaxies (MIRONG) I: Sample Selection and Characterization
• Infrared emission from tidal disruption events --- probing the pc-scale dust content around galactic nuclei
• An enhanced rate of tidal disruptions in the centrally overdense E+A galaxy NGC 3156
• A Family Tree of Optical Transients from Narrow-Line Seyfert 1 Galaxies
• Radio observations of the tidal disruption event XMMSL1 J0740$-$85
• Star formation and nuclear activity in luminous infrared galaxies: An infrared through radio review
• Caltech-NRAO Stripe 82 Survey (CNSS). III: The First Radio-discovered Tidal Disruption Event, CNSS J0019+00
• The Great Observatories All-Sky LIRG Survey: Herschel Image Atlas and Aperture Photometry
• Slow blue nuclear hypervariables in PanSTARRS-1
• A Comprehensive Analysis of Spitzer Supernovae
• Supernova explosions in active galactic nuclear discs
• Initial results from a systematic search for changing-look active galactic nuclei selected via mid-infrared variability
• CHANG-ES V: Nuclear Radio Outflow in a Virgo Cluster Spiral after a Tidal Disruption Event
• Discovery of a very highly extinguished supernova in a luminous infrared galaxy
• Starburst and cirrus models for submillimeter galaxies
• Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg
• AT 2017gbl: a dust obscured TDE candidate in a luminous infrared galaxy
• Discovery of a Mid-infrared Echo from the TDE candidate in the nucleus of ULIRG F01004-2237
• Sifting for Sapphires: Systematic Selection of Tidal Disruption Events in iPTF
• Discovery of Two Supernovae in the Nuclear Regions of the Luminous Infrared Galaxy IC 883
• Unveiling the Sigma-Discrepancy in IR-Luminous Mergers I: Dust & Dynamics
• Active galactic nucleus torus models and the puzzling infrared spectrum of IRAS F10214+4724
• SATMC: Spectral Energy Distribution Analysis Through Markov Chains
• A new look at local ultraluminous infrared galaxies: the atlas and radiative transfer models of their complex physics
• A model for the infrared emission of FSC 10214+4724
• Radio Emission from SN 1994I in NGC 5194 (M 51) - The Best Studied Type Ib/c Radio Supernova
• First results from GeMS/GSAOI for project SUNBIRD: Supernovae UNmasked By Infra-Red Detection
• A Focused, Hard X-ray Look at Arp 299 with NuSTAR
• Late-time observations of the relativistic tidal disruption flare candidate Swift J1112.2-8238
• A Luminous Transient Event in a Sample of WISE-Selected Variable AGN
• Discovery of ATLAS17jrp as an Optical, X-ray and Infrared Bright TDE in a Star-forming Galaxy
• Unveiling The Sigma-Discrepancy II: Revisiting the Evolution of ULIRGs & The Origin of Quasars
• Uncovering the deeply embedded AGN activity in the nuclear regions of the interacting galaxy Arp299
• Evidence for Relativistic Disk Reflection in the Seyfert 1h Galaxy/ULIRG IRAS 05189-2524 Observed by NuSTAR and XMM-Newton
• A hyperluminous obscured quasar at a redshift of z ~ 4.3
• Direct n-body simulations of tidal disruption rate evolution in unequal-mass galaxy mergers
• Compact Resolved Ejecta in the Nearest Tidal Disruption Event
• The infrared echo of SN2010jl and its implications for shock breakout characteristics
• A light echo from the warm outflow in the ULIRG F01004-2237 following a major flare in its optical continuum emission
• Spectroscopic monitoring of the candidate tidal disruption event in F01004-2237

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