Finding the evolutionary link between ULIRGs and radio galaxies

Abstract

Ultraluminous infrared galaxies (ULIRGs) are the remnants of the major mergers of gas-rich galaxies. They are dusty systems and are extremely luminous in the infrared. Both starbursts and active galactic nucleus (AGN) activity supply power in these systems, but it is not clear how these two activities are related to the overall evolution of the merger remnant. Studies suggest that there may be an evolutionary link between ULIRGs and radio galaxies. Radio observations of ULIRGs are a useful tool for understanding this evolutionary path as well as studying the energy contributions from starbursts and AGN. We perform a systematic census of these signatures in 38 ULIRGs using upgraded Giant Metrewave Radio Telescope observations and archival radio data. In the sample, 30 sources have enough frequency coverage to obtain their radio spectrum. Of these, 17 sources show a turnover frequency between 63 and 509 MHz and a spectral age variation from 0.009 to 44 Myr. Also, eight sources have extended structures with projected linear sizes varying from 0.7 to 11 kpc. Our results indicate that the primary energy source in these systems is the AGN rather than star formation. The majority of the ULIRGs in our sample, particularly those in the post-merger stage, exhibit gigahertz-peaked spectrum or compact steep spectrum-like characteristics, suggesting that they are evolving into young radio galaxies. We note that six sources with high star formation activity show a low-frequency turnover and a smaller spectral age; we confirm these six sources host buried AGN. This study enables us to trace the evolutionary link between ULIRGs and radio galaxies.

28 pages, 65 figures

References in corpus (37)

• CASA, the Common Astronomy Software Applications for Radio Astronomy
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• Mid-Infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. II. Properties of WISE-Selected Active Galactic Nuclei in the NDWFS Boötes Field
• The Last of FIRST: The Final Catalog and Source Identifications
• GLEAM: The GaLactic and Extragalactic All-sky MWA survey
• The Rapid ASKAP Continuum Survey I: Design and First Results
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• Compact steep-spectrum and peaked-spectrum radio sources
• A Quick Look at the $3$GHz Radio Sky I. Source Statistics from the Very Large Array Sky Survey
• The power of infrared AGN selection in mergers: a theoretical study
• A Spitzer IRS Low-Resolution Spectroscopic Search for Buried AGNs in Nearby Ultraluminous Infrared Galaxies - A Constraint on Geometry between Energy Sources and Dust -
• Radio Loud and Radio Quiet Quasars
• Hubble Space Telescope H-Band Imaging Survey of Massive Gas-Rich Mergers
• Kinematics and physical conditions of HI in nearby radio sources. The last survey of the old Westerbork Synthesis Radio Telescope
• ALMA [CI]${}^3{P}_1{-}^3{P}_0$ observations of NGC6240: a puzzling molecular outflow, and the role of outflows in the global ${\alpha }_{\mathrm{CO}}$ factor of (U)LIRGs
• A search for HI absorption in nearby radio galaxies using HIPASS
• Modeling the spectral energy distribution of ULIRGs I: the radio spectra
• CAPTURE: A continuum imaging pipeline for the uGMRT
• Calibration of ultraviolet, mid-infrared and radio star formation rate indicators
• Subarcsecond international LOFAR radio images of Arp 220 at 150 MHz: A kpc-scale star forming disk surrounding nuclei with shocked outflows
• Multi-frequency monitoring of gamma-ray loud blazars: I. Light curves and spectral energy distributions
• Discovery of Radio Jets in z~2 ULIRGs with Deep 9.7um Silicate Absorption
• The catalogue of positions of optically bright extragalactic radio sources OBRS-2
• Quantifying the AGN-driven outflows in ULIRGs (QUADROS) II: evidence for compact outflow regions from HST [OIII] imaging observations
• Low frequency radio-FIR correlation in normal galaxies at ~1 kpc scales
• Hard X-Ray to Radio Multiwavelength SED Analysis of Local U/LIRGs in GOALS Sample with Self-consistent AGN Model Including Polar-dust Component
• An Analysis Framework for Understanding the Origin of Nuclear Activity in Low-Power Radio Galaxies
• The Role of AGN in Luminous Infrared Galaxies from the Multiwavelength Perspective
• High-resolution Observations of Low-luminosity Gigahertz-Peaked Spectrum and Compact Steep Spectrum Sources
• Extended Warm Gas in the ULIRG Mrk273: Galactic Outflows and Tidal Debris
• Tracing the Evolution of Ultraluminous Infrared Galaxies into Radio Galaxies with Low Frequency Radio Observations
• Radio properties of ten nearby ultraluminous infrared galaxies with signatures of luminous buried active galactic nuclei
• Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273
• Merging Galaxies in Isolated Environments II. Evolution of Star Formation and Accretion Activity during the Merging Process
• Investigation of the double-lobed sources of the Cygnus constellation core