LOFAR search for radio emission from galaxies hosting tidal disruption events
Kamakshi Kaushik (1), Amitesh Omar (2), Brijesh Kumar (2), Kuntal, Mishra (2), Jagdish Joshi (2) ((1) Savitribai Phule Pune University, Pune,, India, (2) Aryabhatta Research Institute of Observational Sciences, Nainital,, India)
TL;DR
This study used LOFAR at 144 MHz to search for radio emissions from galaxies hosting tidal disruption events, detecting diffuse emission in three galaxies and discussing possible emission mechanisms and absorption effects.
Contribution
First systematic low-frequency radio survey of TDE host galaxies, identifying diffuse emission and exploring absorption effects on transient radio signals.
Findings
Detected diffuse radio emission in three TDE host galaxies.
Non-detection of transient radio emission in most galaxies, possibly due to self-absorption.
Reported non-detection for Sw 1644+57.
Abstract
Radio emission from 23 tidal disruption event host galaxies were searched in the 144 MHz LOFAR-LoTSS2 images. Three host galaxies are detected with diffuse radio emission, which can be interpreted as either galactic synchrotron radio emission or diffuse radio halo in dense galactic environments. Non-detection of (transient) radio emission in majority of galaxies could be due to self-absorption of radio emission associated with the tidal disruption event. The detected objects are AT2018iih, RBS 1032, and NGC 5905. Non-detection for Sw 1644+57 is also reported.
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Taxonomy
TopicsRadio Astronomy Observations and Technology · Galaxies: Formation, Evolution, Phenomena · Astrophysics and Cosmic Phenomena