Giant Radio Galaxies as a probe of the cosmological evolution of the IGM, I. Preliminary deep detections and low-resolution spectroscopy with the SALT

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dc.creatorMachalski, J.
dc.creatorKoziel-Wierzbowska, D.
dc.creatorJamrozy, M.
dc.date2007-10-24
dc.date.accessioned2026-07-07T11:38:19Z
dc.date.available2026-07-07T11:38:19Z
dc.descriptionA problem of the cosmological evolution of the IGM is recalled and a necessity to find distant (z>0.5) giant radio galaxies (GRGs) with the lobe energy densities lower than about 10^{-14} J m^{-3} to solve this problem is emphasized. Therefore we undertake a search for such GRGs on the southern sky hemisphere using the SALT. In this paper we present a selected sample of the GRG candidates and the first deep detections of distant host galaxies, as well as the low-resolution spectra of the galaxies identified on the DSS frames. The data collected during the Performance Verification (P-V) phase show that 21 of 35 galaxies with the spectroscopic redshift have the projected linear size greater than 1 Mpc (for H_{0}=71 km\s\Mpc). However their redshifts do not exceed the value of 0.4 and the energy density in only two of them is less than 10^{-14} J m^{-3}. A photometric redshift estimate of one of them (J1420-0545) suggests a linear extent larger than 4.8 Mpc, i.e. a larger than that of 3C236, the largest GRG known up to now.
dc.description22 pages, 17 Postscript figures, 6 tables
dc.identifierhttps://arxiv.org/abs/0710.4512
dc.identifierhttp://arxiv.org/abs/0710.4512
dc.identifierActaAstron.57:227,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199520
dc.subjectAstrophysics
dc.titleGiant Radio Galaxies as a probe of the cosmological evolution of the IGM, I. Preliminary deep detections and low-resolution spectroscopy with the SALT
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