Clustering of Meter-wave Luminous Objects toward Monoceros

TL;DR

This paper identifies a concentration of meter-wave luminous objects near Monoceros, suggesting they are giant radio relics associated with a nearby galaxy cluster, and proposes their use as tracers for local supercluster structures.

Contribution

It presents evidence linking meter-wave luminous objects to giant radio relics and introduces their potential as indicators of local supercluster structures.

Findings

Objects are likely giant radio relics associated with a nearby galaxy cluster.

The distribution of these objects traces the structure of the Local Supercluster.

Their angular separation matches scaled distances of known relics from cluster centers.

Abstract

A distribution of the meter-wave luminous objects, which are bright at frequency 74 MHz (a wavelength of 4 m) but not detectable at 1.4 GHz (21 cm) in the VLA surveys, shows a notable concentration in a scale of a few degrees toward Monoceros [(l, b)=(225, 4)]. We argue that it is a part of giant radio relics associated with a nearby cluster of galaxies with cz~2400$ km s^{-1} centered on the spiral galaxy NGC 2377. The angular separation of these objects from the clustering center is consistent with the separation of distant relics to the cluster center if scaled by distance. This fact implies that the concentrations of meter-wave luminous objects can be used as a tracer of the structure of the Local Supercluster and it's vicinity.