2008/05/19 by Emmanuel Momjian, E. Momjian, Christopher L. Carilli +3 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Brightness #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Physics #Quasar #Redshift #Spectral index #Spectral line #Very Long Baseline Array #astro-ph
paper · pdf · doi:10.1088/0004-6256/136/1/344
16 pages, 4 figures. To appear in the Astronomical Journal. Submitted: March 11, 2008. Accepted: May 19, 2008
arxiv created 2008/05/19 · openalex publication_date 2008/06/11 · arxiv updated 2015/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present 8.4 GHz Very Large Array (VLA) A configuration and 1.4 GHz Very Long Baseline Array (VLBA) results on the radio continuum emission from the highest redshift radio-loud quasar known to date, the z = 6.12 QSO J1427+3312. The VLA observations show an unresolved steep spectrum source with a flux density of 250 ± 20 μJy at 8.4 GHz and a spectral index value of α 8.4 1.4 = −1.1. The 1.4 GHz VLBA images reveal several continuum components with a total flux density of 1.778 ± 0.109 mJy, which is consistent with the flux density measured with the VLA at 1.4 GHz. Each of these components is resolved with sizes of a few milliarcseconds, and intrinsic brightness temperatures on the order of 10 7 to 10 8 K. The physical characteristics as revealed in these observations suggest that this quasi-stellar object may be a Compact Symmetric Object (CSO), with the two dominant components seen with the VLBA, which are separated by 31 mas (174 pc) and have intrinsic sizes of ∼22–34 pc, being the two radio lobes that are confined by the dense interstellar medium. If indeed a CSO, then the estimated kinematic age of this radio source is only 10 3 yr.