Sub-milliarcsecond Radio Structure of AO 0235+164
نویسندگان
چکیده
منابع مشابه
Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. Iii. Kinematics of Parsec-scale Radio Jets
We report the results of a 15 GHz (2 cm) multiepoch Very Long Baseline Array (VLBA) program, begun in 1994 to study the outflow in radio jets ejected from quasars and active galaxies. The observed flow of 208 distinct features measured in 110 quasars, active galaxies, and BL Lac objects shows highly collimated relativistic motion with apparent transverse velocities typically between zero and ab...
متن کاملSub-milliarcsecond imaging of quasars and active galactic nuclei. IV. Fine-scale structure
We have examined the compact structure in 250 flat-spectrum extragalactic radio sources using interferometric fringe visibilities obtained with the Very Long Baseline Array (VLBA) at 15 GHz. With projected baselines out to 440Mk, we are able to investigate source structure on typical angular scales as small as 0.05 mas. This scale is similar to the resolution of the VLBI Space Observatory Progr...
متن کاملMillimetre - VLBI Monitoring of AGN with Sub - milliarcsecond Resolution
Global millimetre VLBI allows detailed studies of the most central jet regions of AGN with unprecedent spatial resolution of a few 100–1000 Schwartzschild radii to be made. Study of these regions will help to answer the question how the highly relativistic AGN jets are launched and collimated. Since the early 1990s, bright mm-sources have been observed with global 3 mm VLBI. Here we present new...
متن کاملSub-milliarcsecond precision spectro-astrometry of Be stars
Context. The origin of the disks around Be stars is still not known. Further progress requires a proper parametrization of their structure, both spatially and spectrally. This is challenging as the disks are very small. Aims. Here we assess whether a novel method is capable of providing these data. Methods. We obtained spectro-astrometry around the Paβ line of two bright Be stars, α Col and ζ T...
متن کاملSub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei
We have used the Very Long Baseline Array at 15 GHz to image the structure of 132 strong compact active galactic nuclei (AGNs) and quasars with a resolution better than 1 mas and a dynamic range typically exceeding 1000 :1. These observations were made as part of a program to investigate the subparsec structure of quasars and AGNs and to study the changes in their structure with time. Many of t...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1984
ISSN: 0074-1809
DOI: 10.1017/s0074180900077640