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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
Astronomy 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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