Zobrazeno 1 - 10
of 1 677
pro vyhledávání: '"Waters S"'
Asymptotic homogenisation is considered for problems with integral constraints imposed on a slowly-varying microstructure; an insulator with an array of perfectly dielectric inclusions of slowly varying size serves as a paradigm. Although it is well-
Externí odkaz:
http://arxiv.org/abs/2303.17983
Autor:
Grafton-Waters, S., Mao, J., Mehdipour, M., Branduardi-Raymont, G., Page, M., Kaastra, J., Wang, Y., Pinto, C., Kriss, G. A., Walton, D. J., Petrucci, P. -O., Ponti, G., De Marco, B., Bianchi, S., Behar, E., Ebrero, J.
Publikováno v:
A&A 673, A26 (2023)
Obscuration events in type I active galactic nuclei (AGN) have been detected more frequently in recent years. The strong flux decrease in the soft X-ray band between observations has been caused by clouds with large column densities transiting our li
Externí odkaz:
http://arxiv.org/abs/2303.04717
Autor:
Mao, Junjie, Kaastra, J. S., Mehdipour, M., Kriss, G. A., Wang, Yijun, Grafton-Waters, S., Branduardi-Raymont, G., Pinto, C., Landt, H., Walton, D. J., Costantini, E., Di Gesu, L., Bianchi, S., Petrucci, P. -O., De Marco, B., Ponti, G., Fukazawa, Yasushi, Ebrero, J., Behar, E.
Publikováno v:
A&A 665, A72 (2022)
A growing number of transient X-ray obscuration events in type I AGN suggest that our line-of-sight to the central engine is not always free. Multiple X-ray obscuration events have been reported in the nearby Seyfert 1.5 galaxy NGC 3227 from 2000 to
Externí odkaz:
http://arxiv.org/abs/2204.06813
Autor:
Constante-Amores, C. R., Kahouadji, L., Williams, J. G., Moulton, D. E., Turney, B. W., Shin, S., Chergui, J., Juric, D., Waters, S. L.
We examine the time-dependent flow dynamics inside an idealised renal pelvis in the context of a surgical procedure for kidney stone removal, extending previous work by Williams et al. (2020,2021), who showed how vortical flow structures can hinder m
Externí odkaz:
http://arxiv.org/abs/2203.14816
A homogenised model is developed to describe the interaction between aligned strings and an incompressible, viscous, Newtonian fluid. In the case of many strings, the ratio of string separation to domain width gives a small parameter which can be exp
Externí odkaz:
http://arxiv.org/abs/2202.06577
Autor:
Grafton-Waters, S., Dunn, W.
Publikováno v:
2021 Res. Notes AAS 5 233
We showcase a tool suite that enables the fitting of soft X-ray spectra in active galactic nuclei (AGN), without the need for specialist software, allowing access to AGN physics for school students. While these standardised Python tools were useful f
Externí odkaz:
http://arxiv.org/abs/2110.07997
Autor:
Grafton-Waters, S., Ahmed, M., Henson, S., Hinds-Williams, F., Ivanova, B, Marshall, E., Udueni, H., Theodorakis, D., Dunn, W.
We present our analysis of the narrow emission lines produced in the plasma regions within the bright active galactic nucleus of NGC 4151, from an ORBYTS research-with-schools public engagement project. Our goal was to test whether the properties of
Externí odkaz:
http://arxiv.org/abs/2107.12737
Autor:
Mehdipour, M., Kriss, G. A., Kaastra, J. S., Wang, Y., Mao, J., Costantini, E., Arav, N., Behar, E., Bianchi, S., Branduardi-Raymont, G., Brotherton, M., Cappi, M., De Marco, B., Di Gesu, L., Ebrero, J., Grafton-Waters, S., Kaspi, S., Matt, G., Paltani, S., Petrucci, P. -O., Pinto, C., Ponti, G., Ursini, F., Walton, D. J.
Publikováno v:
A&A 652, A150 (2021)
From Swift monitoring of a sample of active galactic nuclei (AGN) we found a transient X-ray obscuration event in Seyfert-1 galaxy NGC 3227, and thus triggered our joint XMM-Newton, NuSTAR, and Hubble Space Telescope (HST) observations to study this
Externí odkaz:
http://arxiv.org/abs/2106.14957