On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure

Abstract

We present a comparison of the properties of a giant radio galaxy and the ambient intergalactic medium, whose properties are inferred from the large-scale distribution in galaxies. The double lobes of the radio galaxy MSH 05-22 are giant--1.8 Mpc projected linear size--and interacting with the environment outside the interstellar medium and coronal halo associated with the host galaxy. The radio lobes appear to be relicts and the double structure is asymmetric. We have examined the large-scale structure in the galaxy distribution surrounding the radio source. The host galaxy of MSH 05-22 is associated with a small group that lies close to the boundary of sheet-like and filamentary density enhancements, and adjacent to a void. Assuming that the galaxies trace gas, the asymmetries in the radio morphology in this case study appear related to the anisotropy in the medium. However, the observed overdensities and structure formation models for the heating of the intergalactic medium (IGM) suggest a density-temperature product for the IGM environment that is an order of magnitude below that expected from the properties of the radio source. The discordance suggests that even sources like MSH 05-22, which are observed in the relatively low-density IGM environment associated with the filamentary large-scale structure and have multiple signatures of being relicts, may be overpressured and evolving towards an equilibrium relaxed state with the ambient IGM. Alternately, it is speculated that astrophysical feedback originating in galaxy overdensities observed 1-2 Mpc to the N and NE of MSH 05-22 might be the mechanism for the heating of the ambient IGM gas.

27 pages including 1 table and 13 figures. To appear in ApJ

References in corpus (4)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• Scaling relations in fossil galaxy groups
• Galactic Wind Signatures around High Redshift Galaxies

Cited by in corpus (22)

• Giant radio galaxies - II. Tracers of large-scale structure
• Cataloging the radio-sky with unsupervised machine learning: a new approach for the SKA era
• MRC B0319-454: Probing the large-scale structure with a giant radio galaxy
• Discovery of a new extragalactic circular radio source with ASKAP: ORC J0102-2450
• The discovery of a radio galaxy of at least 5 Mpc
• MIGHTEE: Are giant radio galaxies more common than we thought?
• The LOFAR view of intergalactic magnetic fields with giant radio galaxies
• Decoding the giant extragalactic radio sources
• The GLEAM 4-Jy (G4Jy) Sample: II. Host-galaxy identification for individual sources
• Giant radio quasars: sample and basic properties
• The relation between the diffuse X-ray luminosity and the radio power of the central AGN in galaxy groups
• Giant radio galaxies in the LoTSS Boötes deep field
• Low-frequency observations of the Giant Radio Galaxy NGC 6251
• Luminous giants populate the dense Cosmic Web: The radio luminosity-environmental density relation for radio galaxies in action
• Stellar populations in hosts of giant radio galaxies and their neighbouring galaxies
• Barbell-shaped giant radio galaxy with ~100 kpc kink in the jet
• An intergalactic medium temperature from a giant radio galaxy
• Powerful Radio Sources in the Southern Sky. I. Optical Identifications
• Revealing the Unusual Structure of the KAT-7-Discovered Giant Radio Galaxy J0133$-$1302
• Revisiting the Giant Radio Galaxy ESO 422-G028: Part I. Discovery of a neutral inflow and recent star formation in a restarted giant
• Discovery of X-shaped Morphology of the Giant Radio Galaxy GRG 0503-286
• Giant radio quasars: composite optical spectra