Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Briggs, F. H."'
Autor:
Offringa, A. R., McKinley, B., Hurley-Walker, N., Briggs, F. H., Wayth, R. B., Kaplan, D. L., Bell, M. E., Feng, L., Neben, A. R., Hughes, J. D., Rhee, J., Murphy, T., Bhat, N. D. R., Bernardi, G., Bowman, J. D., Cappallo, R. J., Corey, B. E., Deshpande, A. A., Emrich, D., Ewall-Wice, A., Gaensler, B. M., Goeke, R., Greenhill, L. J., Hazelton, B. J., Hindson, L., Johnston-Hollitt, M., Jacobs, D. C., Kasper, J. C., Kratzenberg, E., Lenc, E., Lonsdale, C. J., Lynch, M. J., McWhirter, S. R., Mitchell, D. A., Morales, M. F., Morgan, E., Kudryavtseva, N., Oberoi, D., Ord, S. M., Pindor, B., Procopio, P., Prabu, T., Riding, J., Roshi, D. A., Shankar, N. Udaya, Srivani, K. S., Subrahmanyan, R., Tingay, S. J., Waterson, M., Webster, R. L., Whitney, A. R., Williams, A., Williams, C. L.
Astronomical widefield imaging of interferometric radio data is computationally expensive, especially for the large data volumes created by modern non-coplanar many-element arrays. We present a new widefield interferometric imager that uses the w-sta
Externí odkaz:
http://arxiv.org/abs/1407.1943
Autor:
Kanekar, N., Prochaska, J. X., Smette, A., Ellison, S. L., Ryan-Weber, E. V., Momjian, E., Briggs, F. H., Lane, W. M., Chengalur, J. N., Delafosse, T., Grave, J., Jacobsen, D., de Bruyn, A. G.
We report results from a programme aimed at investigating the temperature of neutral gas in high-redshift damped Lyman-$\alpha$ absorbers (DLAs). This involved (1) HI 21cm absorption studies of a large DLA sample, (2) VLBI studies to measure the low-
Externí odkaz:
http://arxiv.org/abs/1312.3640
Autor:
Bernardi, G., Greenhill, L. J., Mitchell, D. A., Ord, S. M., Hazelton, B. J., Gaensler, B. M., de Oliveira-Costa, A., Morales, M. F., Shankar, N. Udaya, Subrahmanyan, R., Wayth, R. B., Lenc, E., Williams, C. L., Arcus, W., Arora, S. B., Barnes, D. G., Bowman, J. D., Briggs, F. H., Bunton, J. D., Cappallo, R. J., Corey, B. E., Deshpande, A., deSouza, L., Emrich, D., Goeke, R., Herne, D., Hewitt, J. N., Johnston-Hollitt, M., Kaplan, D., Kasper, J. C., Kincaid, B. B., Koenig, R., Kratzenberg, E., Lonsdale, C. J., Lynch, M. J., McWhirter, S. R., Morgan, E., Oberoi, D., Pathikulangara, J., Prabu, T., Remillard, R. A., Rogers, A. E. E., Roshi, A., Salah, J. E., Sault, R. J., Srivani, K. S., Stevens, J., Tingay, S. J., Waterson, M., Webster, R. L., Whitney, A. R., Williams, A., Wyithe, J. S. B.
We present a Stokes I, Q and U survey at 189 MHz with the Murchison Widefield Array 32-element prototype covering 2400 square degrees. The survey has a 15.6 arcmin angular resolution and achieves a noise level of 15 mJy/beam. We demonstrate a novel i
Externí odkaz:
http://arxiv.org/abs/1305.6047
Autor:
Beardsley, A. P., Hazelton, B. J., Morales, M. F., Arcus, W., Barnes, D., Bernardi, G., Bowman, J. D., Briggs, F. H., Bunton, J. D., Cappallo, R. J., Corey, B. E., Deshpande, A., deSouza, L., Emrich, D., Gaensler, B. M., Goeke, R., Greenhill, L. J., Herne, D., Hewitt, J. N., Johnston-Hollitt, M., Kaplan, D. L., Kasper, J. C., Kincaid, B. B., Koenig, R., Kratzenberg, E., Lonsdale, C. J., Lynch, M. J., McWhirter, S. R., Mitchell, D. A., Morgan, E., Oberoi, D., Ord, S. M., Pathikulangara, J., Prabu, T., Remillard, R. A., Rogers, A. E. E., Roshi, A., Salah, J. E., Sault, R. J., Shankar, N. Udaya, Srivani, K. S., Stevens, J., Subrahmanyan, R., Tingay, S. J., Wayth, R. B., Waterson, M., Webster, R. L., Whitney, A. R., Williams, A., Williams, C. L., Wyithe, J. S. B.
Using the final 128 antenna locations of the Murchison Widefield Array (MWA), we calculate its sensitivity to the Epoch of Reionization (EoR) power spectrum of red- shifted 21 cm emission for a fiducial model and provide the tools to calculate the se
Externí odkaz:
http://arxiv.org/abs/1204.3111
Autor:
Ord, S. M., Mitchell, D. A., Wayth, R. B., Greenhill, L. J., Bernardi, G., Gleadow, S., Edgar, R. G., Clark, M. A., Allen, G., Arcus, W., Benkevitch, L., Bowman, J. D., Briggs, F. H., Bunton, J. D., Burns, S., Cappallo, R. J., Coles, W. A., Corey, B. E., deSouza, L., Doeleman, S. S., Derome, M., Deshpande, A., Emrich, D., Goeke, R., Gopalakrishna, M. R., Herne, D., Hewitt, J. N., Kamini, P. A., Kaplan, D. L., Kasper, J. C., Kincaid, B. B., Kocz, J., Kowald, E., Kratzenberg, E., Kumar, D., Lonsdale, C. J., Lynch, M. J., McWhirter, S. R., Madhavi, S., Matejek, M., Morales, M. F., Morgan, E., Oberoi, D., Pathikulangara, J., Prabu, T., Rogers, A. E. E., Roshi, A., Salah, J. E., Schinkel, A., Shankar, N. Udaya, Srivani, K. S., Stevens, J., Tingay, S. J., Vaccarella, A., Waterson, M., Webster, R. L., Whitney, A. R., Williams, A., Williams, C.
The Murchison Wide-field Array (MWA) is a low frequency radio telescope, currently under construction, intended to search for the spectral signature of the epoch of re-ionisation (EOR) and to probe the structure of the solar corona. Sited in Western
Externí odkaz:
http://arxiv.org/abs/1010.1733
Autor:
Mitchell, Daniel A., Greenhill, Lincoln J., Ord, Stephen M., Bernardi, Gianni, Wayth, Randall B., Edgar, Richard G., Clark, Michael A., Dal, Kevin, Pfister, Hanspeter, Gleadow, Stewart J., Arcus, W., Briggs, F. H., Benkevitch, L., Bowman, J. D., Bunton, J. D., Burns, S., Cappallo, R. J., Corey, B. E., de Oliveira-Costa, A., Desouza, L., Doeleman, S. S., Derome, M. F., Emrich, D., Glossop, M., Goeke, R., Krishna, M. R. Gopala, Hazelton, B., Herne, D. E., Hewitt, J. N., Kamini, P. A., Kaplan, D. L., Kasper, J. C., Kincaid, B. B., Kocz, J., Kowald, E., Kratzenberg, E., Kumar, D., Lonsdale, C. J., Lynch, M. J., Madhavi, S., Matejek, M., McWhirter, S. R., Morales, M. F., Morgan, E., Oberoi, D., Pathikulangara, J., Prabu, T., Rogers, A., Salah, J. E., Sault, R. J., Shankar, N. Udaya, Srivani, K. S., Stevens, J., Tingay, S. J., Vaccarella, A., Waterson, M., Webster, R. L., Whitney, A. R., Williams, A., Williams, C.
It is shown that the excellent Murchison Radio-astronomy Observatory site allows the Murchison Widefield Array to employ a simple RFI blanking scheme and still calibrate visibilities and form images in the FM radio band. The techniques described are
Externí odkaz:
http://arxiv.org/abs/1008.2551
Publikováno v:
Mon.Not.Roy.Astron.Soc.394:L61,2009
We have used the Very Long Baseline Array to image 18 quasars with foreground damped Lyman-$\alpha$ systems (DLAs) at 327, 610 or 1420 MHz, to measure the covering factor $f$ of each DLA at or near its redshifted HI 21cm line frequency. Including six
Externí odkaz:
http://arxiv.org/abs/0903.4483
Autor:
Horiuchi, S., Tingay, S. J., West, C. J., Tzioumis, A. K., Phillips, C. J., Lovell, J. E. J., Reynolds, J. E., Ellingsen, S. P., Reid, P. B., Cimo, G., Quick, J. F. H., Koyama, Y., Briggs, F. H., Brisken, W. F.
We present the results of global VLBI observations of the BL Lac object PKS 0003-066 at 2.3 and 8.6 GHz, over a 10 year period using data from new and archived VLBA, geodetic VLBI, and global VLBI (including the use of new disk-based recording and so
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610669
Autor:
Briggs, F. H., Barnes, D. G.
Publikováno v:
Astrophys.J. 640 (2006) L127-L130
The Westerbork Synthesis Radio Telescope finds a weak 21cm line emission feature at the coordinates (RA-Dec-velocity) of the sub-Damped Lyman-alpha absorber observed at z_abs=0.00632 in the spectrum of PG1216+069. The emission feature, WSRT-J121921+0
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602505
Autor:
Kanekar, N., Carilli, C. L., Langston, G. I., Rocha, G., Combes, F., Subrahmanyan, R., Stocke, J. T., Menten, K. M., Briggs, F. H., Wiklind, T.
Publikováno v:
Phys.Rev.Lett.95:261301,2005
We have detected the four 18cm OH lines from the $z \sim 0.765$ gravitational lens toward PMN J0134-0931. The 1612 and 1720 MHz lines are in conjugate absorption and emission, providing a laboratory to test the evolution of fundamental constants over
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510760