Zobrazeno 1 - 10
of 19
pro vyhledávání: '"J. J. Wittels"'
Autor:
Chopo Ma, Thomas A. Clark, Brian E. Corey, Charles C. Counselman, J. W. Ryan, Curtis A. Knight, Irwin I. Shapiro, R. J. Coates, J. J. Wittels, Hans F. Hinteregger, Alan R. Whitney, Douglas S. Robertson, W. D. Cotton, Alan E. E. Rogers
Publikováno v:
Journal of the Surveying and Mapping Division. 104:25-34
The application of Very long baseline Interferometry (VLBI) to surveying is reviewed. An examination of the error budget for the VLBI observing system in use by the GSFC/HO/MIT VLBI team is presented, and methods for decreasing the effects of the var
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f77fc4118343638b2680f44defc94eff
https://doi.org/10.1061/jsueax.0000512
https://doi.org/10.1061/jsueax.0000512
Autor:
D. S. Robertson, W. E. Carter, B. E. Corey, W. D. Cotton, C. C. Counselman, I. I. Shapiro, J. J. Wittels, H. F. Hinteregger, C. A. Knight, A. E. E. Rogers, A. R. Whitney, J. W. Ryan, T. A. Clark, R. J. Coates, C. Ma, J. M. Moran
Publikováno v:
Symposium - International Astronomical Union. 82:217-224
Radio interferometric observations of extragalactic radio sources have been made with antennas at the Haystack Observatory in Massachusetts and the Owens Valley Radio Observatory in California during fourteen separate experiments distributed between
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1670decd812dd712781649679379edde
https://doi.org/10.1017/s0074180900036263
https://doi.org/10.1017/s0074180900036263
Autor:
J. J. Wittels
Publikováno v:
International Astronomical Union Colloquium. 37:365-367
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52afadfa8bb38973e33e4d055d6a9c0b
https://doi.org/10.1017/s025292110005377x
https://doi.org/10.1017/s025292110005377x
Autor:
Chopo Ma, James M. Moran, Brian E. Corey, William E. Carter, Charles C. Counselman, Irwin I. Shapiro, J. W. Ryan, Thomas A. Clark, A. R. Whitney, Douglas S. Robertson, Hans F. Hinteregger, A. E. E. Rogers, Curtis A. Knight, W. D. Cotton, R. J. Coates, J. J. Wittels
Publikováno v:
Time and the Earth’s Rotation ISBN: 9789027708939
Radio interferometric observations of extragalactic radio sources have been made with antennas at the Haystack Observatory in Massachusetts and the Owens Valley Radio Observatory in California during fourteen separate experiments distributed between
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd68acdfe07337f2b9e6c3cb357cc5f0
https://doi.org/10.1007/978-94-009-9368-6_38
https://doi.org/10.1007/978-94-009-9368-6_38
Autor:
W. D. Cotton, J. J. Wittels
Publikováno v:
Image Formation from Coherence Functions in Astronomy ISBN: 9789400994515
A two step procedure is developed for the determination of the angular structure of the compact components of radio sources from observations made with very long baseline interferometry (VLBI). The first step is to fit a model composed of circularly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc41f20d7f24bb4b2f849bd1e2fecb4c
https://doi.org/10.1007/978-94-009-9449-2_10
https://doi.org/10.1007/978-94-009-9449-2_10
Publikováno v:
The Astrophysical Journal. 262:L27
VLBI observations at 3.6 and 13 cm wavelengths of the flat-spectrum radio source 2021 + 614 reveal two components, separated by about 6.5 + or - 0.6 milli-arcseconds along a position angle of 36 deg + or - 6 deg. The dual-band observations show that
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b6ec0a7fecf2bddffa63d675f25ea3d
https://doi.org/10.1086/183905
https://doi.org/10.1086/183905
Autor:
Curtis A. Knight, Thomas A. Clark, Charles C. Counselman, Hans F. Hinteregger, J. J. Wittels, Douglas S. Robertson, G. E. Marandino, L. K. Hutton, Irwin I. Shapiro, Alan E. E. Rogers
Publikováno v:
The Astronomical Journal. 81:599
Accurate positions of compact radio sources have been determined from very-long-baseline interferometry (VLBI) observations based on the bandwidth-synthesis technique. The coordinates for 18 extragalactic sources were obtained from sets of observatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c29c19e5160e1522d4086f7e8ce26729
https://doi.org/10.1086/111928
https://doi.org/10.1086/111928
Autor:
Irwin I. Shapiro, Curtis A. Knight, Alan E. E. Rogers, J. J. Wittels, Alan R. Whitney, Curtis R. Menyuk, Hans F. Hinteregger, L. K. Hutton, Thomas A. Clark
Publikováno v:
The Astrophysical Journal. 220:L27
In October 1975, the radio telescopes of the Haystack, National Radio Astronomy, and Owens Valley Radio Observatories were used as an interferometer to monitor, at 8 GHz, the right and left circularly polarized radiation emitted by the quasars 3C 345
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d67fbaccaf4a6f259031e3b77056362
https://doi.org/10.1086/182630
https://doi.org/10.1086/182630
Publikováno v:
The Astrophysical Journal. 225:L47
Late in March 1978, VLBI observations were made at 10.6 GHz of the X-ray-emitting Seyfert galaxy III Zw 2, which is currently undergoing a dramatic outburst of radio radiation. About 1.2 + or - 0.1 Jy, nearly 85% of the total flux density, was receiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::366b8d49ab9df0cf7cd8b51bbf044240
https://doi.org/10.1086/182790
https://doi.org/10.1086/182790
Autor:
Alan E. E. Rogers, J. J. Wittels, Curtis A. Knight, Alan R. Whitney, L. K. Hutton, Irwin I. Shapiro, A. E. Niell, Hans F. Hinteregger, Thomas A. Clark, G. E. Marandino
Publikováno v:
The Astrophysical Journal. 196:13
Interferometric observations taken at 7.8 GHz (gamma approximately = 3.8 cm) with five pairings of antennae of 25 extragalactic radio sources between April, 1972 and May, 1973 are reported. These sources exhibit a broad variety of fine structure from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1daf6fe153e1f272b47a50095f58023
https://doi.org/10.1086/153391
https://doi.org/10.1086/153391