Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Woodley K"'
Autor:
Heyl, J. S., Richer, H., Anderson, J., Fahlman, G., Dotter, A., Hurley, J., Kalirai, J., Rich, R. M., Shara, M., Stetson, P., Woodley, K. A., Zureko, D.
Multi-epoch observations with ACS on HST provide a unique and comprehensive probe of stellar dynamics within NGC 6397. We are able to confront analytic models of the globular cluster with the observed stellar proper motions. The measured proper motio
Externí odkaz:
http://arxiv.org/abs/1210.0826
Autor:
Goldsbury, R., Heyl, J., Richer, H. B., Bergeron, P., Dotter, A., Kalirai, J. S., MacDonald, J., Rich, R. M., Stetson, P. B., Tremblay, P. -E., Woodley, K. A.
We present an empirical determination of the white dwarf cooling sequence in the globular cluster 47 Tucanae. Using spectral models, we determine temperatures for 887 objects from Wide Field Camera 3 data, as well as 292 objects from data taken with
Externí odkaz:
http://arxiv.org/abs/1209.4901
Autor:
Woodley, K. A., Goldsbury, R., Kalirai, J. S., Richer, H. B., Tremblay, P. -E., Anderson, J., Bergeron, P., Dotter, A., Esteves, L., Fahlman, G. G., Hansen, . M. S., Heyl, J., Hurley, J., Rich, R. M., Shara, M. M., Stetson, P. B.
We present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs to pure hydrogen atmosphere white dwarf models. Our photometric dataset is obtained from a 121 orbit
Externí odkaz:
http://arxiv.org/abs/1112.1425
We present new photometry for 323 of the globular clusters in NGC 5128 (Centaurus A), measured for the first time in the $g'r'i'z'$ filter system. The color indices are calibrated directly to standard stars in the $g'r'i'z'$ system and are used to es
Externí odkaz:
http://arxiv.org/abs/1009.3432
Autor:
Goodger, J. L., Hardcastle, M. J., Croston, J. H., Kraft, R. P., Birkinshaw, M., Evans, D. A., Jordan, A., Nulsen, P. E. J., Sivakoff, G. R., Worrall, D. M., Brassington, N. J., Forman, W. R., Gilfanov, M., Jones, C., Murray, S. S., Raychaudhury, S., Sarazin, C. L., Voss, R., Woodley, K. A.
Publikováno v:
Astrophys.J.708:675-697,2010
We present new and archival multi-frequency radio and X-ray data for Centaurus A obtained over almost 20 years at the VLA and with Chandra, with which we measure the X-ray and radio spectral indices of jet knots, flux density variations in the jet kn
Externí odkaz:
http://arxiv.org/abs/0911.2115
Autor:
Voss, R., Gilfanov, M., Sivakoff, G. R., Kraft, R. P., Jordan, A., Raychaudhury, S., Birkinshaw, M., Brassington, N. J., Croston, J. H., Evans, D. A., Forman, W. R., Hardcastle, M. J., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Sarazin, C. L., Woodley, K. A., Worrall, D. M.
Publikováno v:
Astrophys.J.701:471-480,2009
We study the X-ray luminosity function (XLF) of low mass X-ray binaries (LMXB) in the nearby early-type galaxy Centaurus A, concentrating primarily on two aspects of binary populations: the XLF behavior at the low luminosity limit and comparison betw
Externí odkaz:
http://arxiv.org/abs/0906.5364
Autor:
Croston, J. H., Kraft, R. P., Hardcastle, M. J., Birkinshaw, M., Worrall, D. M., Nulsen, P. E. J., Penna, R. F., Sivakoff, G. R., Jordan, A., Brassington, N. J., Evans, D. A., Forman, W. R., Gilfanov, M., Goodger, J. L., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Raychaudhury, S., Sarazin, C. L., Voss, R., Woodley, K. A.
We present new results on the shock around the southwest radio lobe of Centaurus A using data from the Chandra Very Large Programme observations. The X-ray spectrum of the emission around the outer southwestern edge of the lobe is well described by a
Externí odkaz:
http://arxiv.org/abs/0901.1346
Autor:
Kraft, R. P., Hardcastle, M. J., Sivakoff, G. R., Jordán, A., Nulsen, P. E. J., Birkinshaw, M., Forman, W. R., Jones, C., Worrall, D. M., Croston, J. H., Evans, D. A., Raychaudhury, S., Murray, S. S., Brassington, N. J., Goodger, J. L., Harris, W. E., Juett, A. M., Sarazin, C. L., Woodley, K. A.
We present preliminary results from a deep (600 ks) {\em Chandra} observation of the hot interstellar medium of the nearby early-type galaxy Centaurus A (Cen A). We find a surface brightness discontinuity in the gas $\sim$3.5 kpc from the nucleus spa
Externí odkaz:
http://arxiv.org/abs/0803.3595
Autor:
Worrall, D. M., Birkinshaw, M., Kraft, R. P., Sivakoff, G. R., Jordan, A., Hardcastle, M. J., Brassington, N. J., Croston, J. H., Evans, D. A., Forman, W. R., Harris, W. E., Jones, C., Juett, A. M., Murray, S. S., Nulsen, P. E. J., Raychaudhury, S., Sarazin, C. L., Woodley, K. A.
We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens with increasing distance from the jet axis, and that this steepening can
Externí odkaz:
http://arxiv.org/abs/0712.3579
Autor:
Gomez, M., Woodley, K. A.
Using Magellan/IMACS images covering a 1.2 x 1.2 sq. degree FOV with seeing of 0.4"-0.6", we have applied convolution techniques to analyse the light distribution of 364 confirmed globular cluster in the field of NGC 5128 and to obtain their structur
Externí odkaz:
http://arxiv.org/abs/0710.1778