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Title:
Very Large Array and Very Long Baseline Array Observations of the Highest Redshift Radio-Loud QSO J1427+3312 at Z = 6.12
Authors:
Momjian, Emmanuel; Carilli, Christopher L.; McGreer, Ian D.
Affiliation:
AA(NAIC, Arecibo Observatory, HC 3, Box 53995, Arecibo, PR 00612, USA ; Now at: National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA; ), AB(National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801, USA ), AC(Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA )
Publication:
The Astronomical Journal, Volume 136, Issue 1, pp. 344-349 (2008). (AJ Homepage)
Publication Date:
07/2008
Origin:
IOP
AJ Keywords:
galaxies: active, galaxies: high-redshift, galaxies: individual: J1427+3312, radio continuum: galaxies, techniques: interferometric
DOI:
10.1088/0004-6256/136/1/344
Bibliographic Code:
2008AJ....136..344M

Abstract

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 α8.4 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 107 to 108 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 103 yr.
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