Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Porcas, R. W."'
Autor:
Volino, F., Wucknitz, O., Porcas, R. W., Ros, E., McKean, J. P., Brunthaler, A., Munoz, J. A., Castangia, P., Garrett, M. A., Henkel, C., Impellizzeri, C. M. V., Roy, A.
The gravitational lens system MG J0414+0534 is formed by an elliptical galaxy at redshift ~0.96 and a quasar at z~2.64. The system geometry is typical of lensing by an elliptical galaxy with the QSO close to and inside a fold caustic. It shows 4 imag
Externí odkaz:
http://arxiv.org/abs/1011.6652
Autor:
Rioja, M. J., Dodson, R., Porcas, R. W., Ferris, D., Reynolds, J., Sasao, T., Schilizzi, R. T.
We revisit the "Cluster-Cluster" or multi-view Very-Long-Baseline-Interferometry (VLBI) technique from the perspective of its synergy with the multi-beam features inherent in the Australian Square Kilometer Array Pathfinder (ASKAP)and its potential t
Externí odkaz:
http://arxiv.org/abs/0909.4590
Autor:
Porcas, R. W.
Aims: The effect of frequency-dependent AGN core positions (``core-shifts'') on radio Very Long Baseline Interferometry (VLBI) global astrometry measurements is investigated. Methods: The basic equations relating to VLBI astrometry are reviewed, incl
Externí odkaz:
http://arxiv.org/abs/0909.0933
MG 2016+112 is a quadruply imaged lens system with two complete images A and B and a pair of merging partial images in region C as seen in the radio. The merging images are found to violate the expected mirror symmetry. This indicates an astrometric
Externí odkaz:
http://arxiv.org/abs/0810.5341
Autor:
More, A., McKean, J. P., Muxlow, T. W. B., Porcas, R. W., Fassnacht, C. D., Koopmans, L. V. E.
The gravitational lens system CLASS B2108+213 has two lensed images separated by 4.56 arcsec. Such a wide image separation suggests that the lens is either a massive galaxy, or is composed of a group of galaxies. To investigate the structure of the l
Externí odkaz:
http://arxiv.org/abs/0712.1145
Publikováno v:
Mon.Not.Roy.Astron.Soc.377:1623-1634,2007
Central gravitational image detection is very important for the study of the mass distribution of the inner parts ($\sim 100$ pc) of lens galaxies. However, the detection of such images is extremely rare and difficult. We present a 1.7-GHz High Sensi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703226
Autor:
More, A., Porcas, R. W.
We present Global VLBI and HSA images of the gravitational lens B2016+112 at 18, 6 and 3.6 cm. Previous VLBI observations showed that images A and B (which are clearly lensed images of a single background source) and the elongated region C are each d
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701021
Autor:
O'Brien, T. J., Bode, M. F., Porcas, R. W., Muxlow, T. W. B., Eyres, S. P. S., Beswick, R. J., Garrington, S. T., Davis, R. J., Evans, A.
Nova outbursts take place in binary star systems comprising a white dwarf and either a low-mass Sun-like star or, as in the case of the recurrent nova RS Ophiuchi, a red giant. Although the cause of these outbursts is known to be thermonuclear explos
Externí odkaz:
http://arxiv.org/abs/astro-ph/0606224
We present preliminary results from a statistical survey of compact structure in faint radio sources. Around 1000 sources from the VLA FIRST survey (flux densities larger than 1 mJy at 1.4 GHz) have been observed with the single-baseline interferomet
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412651
We present eight epochs of 43 GHz, dual-polarisation VLBA observations of the gravitational lens system PKS 1830-211, made over fourteen weeks. A bright, compact ``core'' and a faint extended ``jet'' are clearly seen in maps of both lensed images at
Externí odkaz:
http://arxiv.org/abs/astro-ph/0301197