Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Bradley, R. F."'
Autor:
Neben, A. R., Hewitt, J. N., Bradley, R. F., Dillon, J. S., Bernardi, G., Bowman, J. D., Briggs, F., Cappallo, R. J., Corey, B. E., Deshpande, A. A., Goeke, R., Greenhill, L. J., Hazelton, B. J., Johnston-Hollitt, M., Kaplan, D. L., Lonsdale, C. J., McWhirter, S. R., Mitchell, D. A., Morales, M. F., Morgan, E., Oberoi, D., Ord, S. M., Prabu, T., Shankar, N. Udaya, Srivani, K. S., Subrahmanyan, R., Tingay, S. J., Wayth, R. B., Webster, R. L., Williams, A., Williams, C. L.
Accurate antenna beam models are critical for radio observations aiming to isolate the redshifted 21cm spectral line emission from the Dark Ages and the Epoch of Reionization and unlock the scientific potential of 21cm cosmology. Past work has focuse
Externí odkaz:
http://arxiv.org/abs/1602.05249
Autor:
Neben, A. R., Bradley, R. F., Hewitt, J. N., Bernardi, G., Bowman, J. D., Briggs, F., Cappallo, R. J., Deshpande, A. A., Goeke, R., Greenhill, L. J., Hazelton, B. J., Johnston-Hollitt, M., Kaplan, D. L., Lonsdale, C. J., McWhirter, S. R., Mitchell, D. A., Morales, M. F., Morgan, E., Oberoi, D., Ord, S. M., Prabu, T., Shankar, N. Udaya, Srivani, K. S., Subrahmanyan, R., Tingay, S. J., Wayth, R. B., Webster, R. L., Williams, A., Williams, C. L.
Detection of the fluctuations in 21 cm line emission from neutral hydrogen during the Epoch of Reionization in thousand hour integrations poses stringent requirements on calibration and image quality, both of which necessitate accurate primary beam m
Externí odkaz:
http://arxiv.org/abs/1505.07114
Autor:
Asner, D. M., Bradley, R. F., de Viveiros, L., Doe, P. J., Fernandes, J. L., Fertl, M., Finn, E. C., Formaggio, J. A., Furse, D., Jones, A. M., Kofron, J. N., LaRoque, B. H., Leber, M., McBride, E. L., Miller, M. L., Mohanmurthy, P., Monreal, B., Oblath, N. S., Robertson, R. G. H., Rosenberg, L. J, Rybka, G., Rysewyk, D., Sternberg, M. G., Tedeschi, J. R., Thummler, T., VanDevender, B. A., Woods, N. L.
Publikováno v:
Phys. Rev. Lett. 114, 162501 (2015)
It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Cyclotron radiation, the particular form of radiation emitted by an electron orbiting in a magnetic field, was first derived in 1904. Despite the simplic
Externí odkaz:
http://arxiv.org/abs/1408.5362
Autor:
Burns, Jack O., Lazio, T. J. W., Bale, S. D., Bowman, J. D., Bradley, R. F., Carilli, C. L., Furlanetto, S. R., Harker, G. J. A., Loeb, A., Pritchard, J. R.
A concept for a new space-based cosmology mission called the Dark Ages Radio Explore (DARE) is presented in this paper. DARE's science objectives include (1) When did the first stars form? (2) When did the first accreting black holes form? (3) When d
Externí odkaz:
http://arxiv.org/abs/1106.5194
Autor:
Fisher, J. R., Bradley, R. F., Brisken, W. F., Cotton, W. D., Emerson, D. T., Kerr, A. R., Lacasse, R. J., Morgan, M. A., Napier, P. J., Norrod, R. D., Payne, J. M., Pospieszalski, M. W., Symmes, A., Thompson, A. R., Webber, J. C.
This white paper offers cautionary observations about the planning and development of new, large radio astronomy instruments. Complexity is a strong cost driver so every effort should be made to assign differing science requirements to different inst
Externí odkaz:
http://arxiv.org/abs/0908.3826
Autor:
Duffy, L. D., Sikivie, P., Tanner, D. B., Asztalos, S. J., Hagmann, C., Kinion, D., Rosenberg, L. J, van Bibber, K., Yu, D. B., Bradley, R. F.
Publikováno v:
Phys.Rev.D74:012006,2006
We have performed a high resolution search for galactic halo axions in cold flows using a microwave cavity detector. The analysis procedure and other details of this search are described. No axion signal was found in the mass range 1.98-2.17 micro-eV
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603108
Autor:
Duffy, L., Sikivie, P., Tanner, D. B., Asztalos, S., Hagmann, C., Kinion, D., Rosenberg, L. J, van Bibber, K., Yu, D., Bradley, R. F.
Publikováno v:
Phys.Rev.Lett.95:091304,2005
Theoretical arguments predict that the distribution of cold dark matter in spiral galaxies has peaks in velocity space associated with non-thermalized flows of dark matter particles. We searched for the corresponding peaks in the spectrum of microwav
Externí odkaz:
http://arxiv.org/abs/astro-ph/0505237
The neutral hydrogen 21-cm spectral line (1420.4 MHz) and the four 18-cm lines of the hydroxyl molecule (1612-1720 MHz) are observable at redshifts which put their measured line frequencies well below their protected frequency bands. Part of the reds
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502108
Autor:
Asztalos, S. J., Bradley, R. F., Duffy, L., Hagmann, C., Kinion, D., Moltz, D. M., Rosenberg, L. J, Sikivie, P., Stoeffl, W., Sullivan, N. S., Tanner, D. B., van Bibber, K., Yu, D. B.
Publikováno v:
Phys.Rev.D69:011101,2004
The axion is a hypothetical elementary particle and cold dark matter candidate. In this RF cavity experiment, halo axions entering a resonant cavity immersed in a static magnetic field convert into microwave photons, with the resulting photons detect
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310042
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