Zobrazeno 1 - 10
of 2 420
pro vyhledávání: '"Zhang, W W"'
Autor:
Wang, Z. Y., Zhang, W. W.
In recent years, machine learning methods represented by deep neural networks (DNN) have been a new paradigm of turbulence modeling. However, in the scenario of high Reynolds numbers, there are still some bottlenecks, including the lack of high-fidel
Externí odkaz:
http://arxiv.org/abs/2211.00601
Akademický článek
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Autor:
Buisson, D. J. K., Parker, M. L., Kara, E., Vasudevan, R. V., Lohfink, A. M., Pinto, C., Fabian, A. C., Ballantyne, D. R., Boggs, S. E., Craig, F. E. Christensen W. W., Farrah, D., Hailey, C. J., Harrison, F. A., Ricci, C., Stern, D., Walton, D. J., Zhang, W. W.
We present two new NuSTAR observations of the narrow line Seyfert 1 (NLS1) galaxy Mrk 766 and give constraints on the two scenarios previously proposed to explain its spectrum and that of other NLS1s: relativistic reflection and partial covering. The
Externí odkaz:
http://arxiv.org/abs/1808.00014
Autor:
Porquet, D., Reeves, J. N., Matt, G., Marinucci, A., Nardini, E., Braito, V., Lobban, A., Ballantyne, D. R., Boggs, S. E., Christensen, F. E., Dauser, T., Farrah, D., Garcia, J., Hailey, C. J., Harrison, F., Stern, D., Tortosa, A., Ursini, F., Zhang, W. W.
Publikováno v:
A&A 609, A42 (2018)
We perform an X-ray spectral analysis of the brightest and cleanest bare AGN known so far, Ark 120, in order to determine the process(es) at work in the vicinity of the SMBH. We present spectral analysis of data from an extensive campaign observing A
Externí odkaz:
http://arxiv.org/abs/1707.08907
Autor:
Zoghbi, Abderahmen, Matt, G., Miller, J. M., Lohfink, A. M., Walton, D. J., Ballantyne, D. R., Garcia, J. A., Stern, D., Koss, M. J., Farrah, D., Harrison, F. A., Boggs, S. E., Christensen, F. E., Craig, W., Hailey, C. J., Zhang, W. W.
MCG-5-23-16 was targeted in early 2015 with a half mega-seconds observing campaign using NuSTAR. Here we present the spectral analysis of these datasets along with an earlier observation and study the relativistic reflection and the primary coronal s
Externí odkaz:
http://arxiv.org/abs/1701.02309
This article studies a direct numerical approach for fractional advection-diffusion equations (ADEs). Using a set of cubic trigonometric B-splines as test functions, a differential quadrature (DQ) method is firstly proposed for the 1D and 2D time-fra
Externí odkaz:
http://arxiv.org/abs/1611.01597
Autor:
Boorman, Peter G., Gandhi, P., Alexander, D., Annuar, A., Ballantyne, D. R., Bauer, F., Boggs, S. E., Brandt, W. N., Brightman, M., Christensen, F. E., Craig, W. W., Farrah, D., Hailey, C. J., Harrison, F. A., Hoenig, S. F., Koss, M., LaMassa, S. M., Masini, A., Ricci, C., Risaliti, G., Stern, D., Zhang, W. W.
We analyse high-quality NuSTAR observations of the local (z = 0.011) Seyfert 2 active galactic nucleus (AGN) IC 3639, in conjunction with archival Suzaku and Chandra data. This provides the first broadband X-ray spectral analysis of the source, spann
Externí odkaz:
http://arxiv.org/abs/1610.08997
Autor:
Zoghbi, Abderahmen, Miller, J. M., King, A. L., Miller, M. C., Proga, D., Kallman, T., Fabian, A. C., Harrison, F. A., Kaastra, J., Raymond, J., Reynolds, C. S., Boggs, S. E., Christensen, F. E., Craig, W., Hailey, C. J., Stern, D., Zhang, W. W.
Disk and wind signatures are seen in the soft state of Galactic black holes, while the jet is seen in the hard state. Here we study the disk-wind connection in the $\rho$ class of variability in GRS 1915+105 using a joint NuSTAR-Chandra observation.
Externí odkaz:
http://arxiv.org/abs/1610.05772
Autor:
Ricci, C., Assef, R. J., Stern, D., Nikutta, R., Alexander, D. M., Asmus, D., Ballantyne, D. R., Bauer, F. E., Blain, A. W., Boggs, S., Boorman, P. G., Brandt, W. N., Brightman, M., Chang, C. S., Chen, C. -T. J., Christensen, F. E., Comastri, A., Craig, W. W., Díaz-Santos, T., Eisenhardt, P. R., Farrah, D., Gandhi, P., Hailey, C. J., Harrison, F. A., Jun, H. D., Koss, M. J., LaMassa, S., Lansbury, G. B., Markwardt, C. B., Stalevski, M., Stanley, F., Treister, E., Tsai, C. -W., Walton, D. J., Wu, J. W., Zappacosta, L., Zhang, W. W.
Hot, Dust-Obscured Galaxies (Hot DOGs), selected from the WISE all sky infrared survey, host some of the most powerful Active Galactic Nuclei (AGN) known, and might represent an important stage in the evolution of galaxies. Most known Hot DOGs are at
Externí odkaz:
http://arxiv.org/abs/1609.04808
Autor:
Madejski, G. M., Nalewajko, K., Madsen, K. K., Chiang, J., Baloković, M., Paneque, D., Furniss, A. K., Hayashida, M., Urry, C. M., Sikora, M., Ajello, M., Blandford, R. D., Harrison, F. A., Sanchez, D., Giebels, B., Stern, D., Alexander, D. M., Barret, D., Boggs, S. E., Christensen, F. E., Craig, W. W., Forster, K., Giommi, P., Grefenstette, B., Hailey, C., Hornstrup, A., Kitaguchi, T., Koglin, J. E., Mao, P. H., Miyasaka, H., Mori, K., Perri, M., Pivovaroff, M. J., Puccetti, S., Rana, V., Westergaard, N. J., Zhang, W. W., Zoglauer, A.
We report the first hard X-ray observations with NuSTAR of the BL Lac type blazar PKS 2155-304, augmented with soft X-ray data from XMM-Newton and gamma-ray data from the Fermi Large Area Telescope, obtained in April 2013 when the source was in a ver
Externí odkaz:
http://arxiv.org/abs/1609.02203