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Article overview
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On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure | Ravi Subrahmanyan
; Lakshmi Saripalli
; Vicky Safouris
; Richard W. Hunstead
; | Date: |
25 Jan 2008 | 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. | Source: | arXiv, 0801.3910 | Services: | Forum | Review | PDF | Favorites |
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