High-resolution images of five radio quasars at early cosmological epochs

Details High-resolution images of five radio quasars at early cosmological epochs High-resolution images of five radio quasars at early cosmological epochs

2010-09-25

arxiv.org/abs/1009.5023v1

Astronomy & Astrophysics, Vol. 524, A83 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 2 figures, accepted for Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361/201015554

Context: Until now, there have only been seven quasars at z>4.5 whose the high-resolution radio structure had been studied in detail with Very Long Baseline Interferometry (VLBI) imaging. Aims: We almost double the number of VLBI-imaged quasars at these high redshifts with the aim of studying their redshift-dependent structural and physical properties in a larger sample. Methods: We observed five radio quasars (J0813+3508, J1146+4037, J1242+5422, J1611+0844, and J1659+2101) at 4.5

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