Radio emission from dust-obscured galaxies

Abstract

The coevolution of galaxies and their central supermassive black holes is a subject of intense research. A class of objects, the dust-obscured galaxies (DOGs) are particularly interesting in this respect as they are thought to represent a short evolutionary phase when violent star formation activity in the host galaxy may coexist with matter accretion onto the black hole powering the active nucleus. Here we investigate different types of DOGs classified by their mid-infrared spectral energy distributions to reveal whether they can be distinguished by their arcsec-scale radio properties. Radio emission is unaffected by dust obscuration and may originate from both star formation and an active nucleus. We analyse a large sample of 661 DOGs complied from the literature and find that only a small fraction of them ($\sim 2$ per cent) are detected with flux densities exceeding $\sim 1$ mJy in the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey. These radio-detected objects are almost exclusively `power-law' DOGs. Stacking analysis of the FIRST image cutouts centred on the positions of individually radio-undetected sources suggests that weak radio emission is present in `power-law' DOGs. On the other hand, radio emission from `bump' DOGs is only marginally detected in the median-stacked FIRST image.

7 pages, 3 figures, accepted to MNRAS

References in corpus (14)

• The Last of FIRST: The Final Catalog and Source Identifications
• A Significant Population of Very Luminous Dust-Obscured Galaxies at Redshift z ~ 2
• Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
• The First Hyper-Luminous Infrared Galaxy Discovered by WISE
• The Most Luminous Galaxies Discovered by WISE
• Submillimeter Follow-up of WISE-Selected Hyperluminous Galaxies
• Photometric Redshift with Bayesian Priors on Physical Properties of Galaxies
• The nature of star formation in distant ultraluminous infrared galaxies selected in a remarkably narrow redshift range
• Submillimetre observations of WISE/radio-selected AGN and their environments
• Clustering of infrared-bright dust-obscured galaxies revealed by the Hyper Suprime-Cam and WISE
• The role of the most luminous, obscured AGN in galaxy assembly at z~2
• Radio Detection of Radio-Quiet Galaxies
• Star-Formation in Low Radio Luminosity AGN from the Sloan Digital Sky Survey
• High-resolution VLA Imaging of Obscured Quasars: Young Radio Jets Caught in a Dense ISM

Cited by in corpus (4)

• A${}^3$COSMOS: A census on the molecular gas mass and extent of main-sequence galaxies across cosmic time
• Deep silence: radio properties of little red dots
• Detection of radio-AGN in dust-obscured galaxies using deep uGMRT radio continuum observations
• Wide-field GMRT imaging of X-shaped Radio-Galaxies: Spectral properties of 4C32.25 and 4C61.23