Can I read Murchison Widefield Array detection of steep-spectrum, diffuse, non-thermal radio emission within Abell 1127 on EtoBox?

Murchison Widefield Array detection of steep-spectrum, diffuse, non-thermal radio emission within Abell 1127 by Duchesne, Stefan W.; Johnston-Hollitt, Melanie; Zhu, Zhenghao; Wayth, Randall B.; Line, Jack L. B. is a scholarly article available to read on EtoBox.

What is Murchison Widefield Array detection of steep-spectrum, diffuse, non-thermal radio emission within Abell 1127 about?

Diffuse, non-thermal emission in galaxy clusters is increasingly being detected in low-frequency radio surveys and images. We present a new diffuse, steep-spectrum, non-thermal radio source within the cluster Abell 1127 found in survey data from the Murchison Widefield Array (MWA). We perform follow-up observations with the 'extended' configuration MWA Phase II with improved resolution to better resolve the source and measure its low-frequency spectral properties. We use archival Very Large Array S-band data to remove the discrete source contribution from the MWA data, and from a power law model fit we find a spectral index of $-1.83\pm0.29$ broadly consistent with relic-type sources. The source is revealed by the Giant Metrewave Radio Telescope (GMRT) at 150 MHz to have an elongated morphology, with a projected linear size of 850 kpc as measured in the MWA data. Using Chandra observations we derive morphological estimators and confirm quantitatively that the cluster is in a disturbed dynamical state, consistent with the majority of phoenices and relics being hosted by merging clusters. We discuss the implications of relying on morphology and low-resolution imaging alone for the cl

Author

Duchesne, Stefan W.; Johnston-Hollitt, Melanie; Zhu, Zhenghao; Wayth, Randall B.; Line, Jack L. B.

Published

2020

Language

EN