Zobrazeno 1 - 10
of 96
pro vyhledávání: '"GWINN, C. R."'
We report on the substructure of visibility functions in the delay domain of PSRs B0329+54, B0823+26, B0834+06, B1933+16 and B0833-45 (Vela) observed with earth-earth and RadioAstron space-earth two-element interferometers at frequencies of 324 MHz a
Externí odkaz:
http://arxiv.org/abs/1912.03970
Autor:
Popov, M. V., Bartel, N., Gwinn, C. R., Johnson, M. D., Andrianov, A., Fadeev, E., Joshi, B. C., Kardashev, N. S., Karuppusamy, R., Kovalev, Y. Y., Kramer, M., Rudnitskiy, A., Shishov, V. I., Smirnova, T. V., Soglasnov, V. A., Zensus, J. A.
We have resolved the scatter-broadened image of PSR B0329+54 and detected substructure within it. These results are not influenced by any extended structure of a source but instead are directly attributed to the interstellar medium. We obtained these
Externí odkaz:
http://arxiv.org/abs/1609.04008
Autor:
Shishov, V. I., Smirnova, T. V., Gwinn, C. R., Andrianov, A. S., Popov, M. V., Rudnitskiy, A. G., Soglasnov, V. A.
We carried out observations of pulsar PSR B1919+21 at 324 MHz to study the distribution of interstellar plasma in the direction of this pulsar. We used the RadioAstron (RA) space radiotelescope together with two ground telescopes: Westerbork (WB) and
Externí odkaz:
http://arxiv.org/abs/1605.05727
Almost 50 years after radio pulsars were discovered in 1967, our understanding of these objects remains incomplete. On the one hand, within a few years it became clear that neutron star rotation gives rise to the extremely stable sequence of radio pu
Externí odkaz:
http://arxiv.org/abs/1506.07881
Autor:
Gwinn, C. R., Popov, M. V., Bartel, N., Andrianov, A. S., Johnson, M. D., Joshi, B. C., Kardashev, N. S., Karuppusamy, R., Kovalev, Y. Y., Kramer, M., Rudnitskii, A. G., Safutdinov, E. R., Shishov, V. I., Smirnova, T. V., Soglasnov, V. A., Steinmassl, S. F., Zensus, J. A., Zhuravlev, V. I.
Publikováno v:
Astrophysical journal 822 (2016) 96
We discovered fine-scale structure within the scattering disk of PSR B0329+54 in observations with the RadioAstron ground-space radio interferometer. Here, we describe this phenomenon, characterize it with averages and correlation functions, and inte
Externí odkaz:
http://arxiv.org/abs/1501.04449
Publikováno v:
The Astrophysical Journal Letters 794 (2014) L14
We have detected substructure within the smooth scattering disk of the celebrated Galactic Center radio source Sagittarius A* (SgrA*). We observed this structure at 1.3 cm wavelength with the Very Long Baseline Array together with the Green Bank Tele
Externí odkaz:
http://arxiv.org/abs/1409.0530
Autor:
Smirnova, T. V., Shishov, V. I., Popov, M. V., Gwinn, C. R., Anderson, J. M., Andrianov, A. S., Bartel, N., Deller, A., Johnson, M. D., Joshi, B. C., Kardashev, N. S., Karuppusamy, R., Kovalev, Y. Y., Kramer, M., Soglasnov, V. A., Zensus, J. A., Zhuravlev, V. I.
Publikováno v:
Astrophysical Journal 786 (2014) 115
RadioAstron space-ground VLBI observations of the pulsar B0950+08, conducted with the 10-m space radio telescope in conjunction with the Arecibo 300-m telescope and Westerbork Synthesis Radio Telescope at a frequency of 324 MHz, were analyzed in orde
Externí odkaz:
http://arxiv.org/abs/1402.6346
Autor:
Strader, M. J., Johnson, M. D., Mazin, B. A., Jaeger, G. V. Spiro, Gwinn, C. R., Meeker, S. R., Szypryt, P., van Eyken, J. C., Marsden, D., O'Brien, K., Walter, A. B., Ulbricht, G., Stoughton, C., Bumble, B.
Publikováno v:
Astrophys. J. Lett. 779, L12 (2013)
We observe an extraordinary link in the Crab pulsar between the enhancement of an optical pulse and the timing of the corresponding giant radio pulse. At optical through infrared wavelengths, our observations use the high time resolution of ARCONS, a
Externí odkaz:
http://arxiv.org/abs/1309.3270
Autor:
Gwinn, C. R., Johnson, M. D., Reynolds, J. E., Jauncey, D. L., Tzioumis, A. K., Dougherty, S., Carlson, B., Del Rizzo, D., Hirabayashi, H., Kobayashi, H., Murata, Y., Edwards, P. G., Quick, J. F. H., Flanagan, C. S., McCulloch, P. M.
Publikováno v:
Astrophysical Journal (2012) 758, 6
We compare the noise in interferometric measurements of the Vela pulsar from ground- and space-based antennas with theoretical predictions. The noise depends on both the flux density and the interferometric phase of the source. Because the Vela pulsa
Externí odkaz:
http://arxiv.org/abs/1208.0039
Autor:
Gwinn, C. R., Johnson, M. D., Reynolds, J. E., Jauncey, D. L., Tzioumis, A. K., Hirabayashi, H., Kobayashi, H., Murata, Y., Edwards, P. G., Dougherty, S., Carlson, B., del Rizzo, D., Quick, J. F. H., Flanagan, C. S., McCulloch, P. M.
Publikováno v:
Astrophysical Journal (2012), 758, 7
We present measurements of the linear diameter of the emission region of the Vela pulsar at observing wavelength lambda=18 cm. We infer the diameter as a function of pulse phase from the distribution of visibility on the Mopra-Tidbinbilla baseline. A
Externí odkaz:
http://arxiv.org/abs/1208.0040