Zobrazeno 1 - 10
of 319
pro vyhledávání: '"Pounds, K."'
Autor:
King, A. R., Pounds, K. A.
We consider how the radiation pressure of an accreting supermassive hole (SMBH) affects the interstellar medium around it. Much of the gas originally surrounding the hole is swept into a shell with a characteristic radius somewhat larger than the bla
Externí odkaz:
http://arxiv.org/abs/1310.3969
Autor:
Pounds, K. A.
An XMM-Newton observation of the luminous Seyfert galaxy PG1211+143 in 2001 revealed the first clear evidence for a highly ionised high speed wind (in a non-BAL AGN), with a velocity of v~0.09c based on the identification of blue-shifted absorption l
Externí odkaz:
http://arxiv.org/abs/1310.2836
Autor:
Cappi, M., Done, C., Behar, E., Bianchi, S., Braito, V., Costantini, E., Dadina, M., Feruglio, C., Fiore, F., Gallagher, S., Gandhi, P., Grosso, N., Kaastra, J., King, A., Lobban, A., Maiolino, R., Piconcelli, E., Ponti, G., Porquet, D., Pounds, K., Proga, D., Ranalli, P., Reeves, J., Risaliti, G., Hidalgo, P. Rodriguez, Rovilos, E., Sim, S., Stewart, G., Tombesi, F., Tsuru, T. G., Vaughan, S., Wang, D., Worrall, D.
Understanding the astrophysics of feedback in active galactic nuclei (AGN) is key to understanding the growth and co-evolution of supermassive black holes and galaxies. AGN-driven winds/outflows are potentially the most effective way of transporting
Externí odkaz:
http://arxiv.org/abs/1306.2330
An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 - III. FeK emission and absorption
Autor:
Pounds, K. A., Vaughan, S.
An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 detected a photo-ionized outflow with a complex absorption line velocity structure and a broad correlation of velocity with ionization parameter, shown in Pounds et al (2011)
Externí odkaz:
http://arxiv.org/abs/1202.0780
Autor:
Pounds, K. A., Vaughan, S.
An extended XMM-Newton observation of the Seyfert I galaxy NGC 4051 in 2009 revealed a complex absorption spectrum, with a wide range of outflow velocities and ionisation states.The main velocity and ionisation structure was interpreted in Paper I in
Externí odkaz:
http://arxiv.org/abs/1104.1062
We present an analysis of the high frequency X-ray variability of NGC 4051 (M_BH ~ 1.7*10^6 M_sun) based on a series of XMM-Newton observations taken in 2009 with a total exposure of ~570 ks (EPIC pn). These data reveal the form of the power spectrum
Externí odkaz:
http://arxiv.org/abs/1101.1802
An extended XMM-Newton observation of the Seyfert galaxy NGC 4051. I. Evidence for a shocked outflow
Autor:
Pounds, K. A., Vaughan, S.
An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 has revealed a rich absorption line spectrum indicating the presence of a photoionized outflow with a wide range of velocities and ionization parameter. At low continuum fluxes an em
Externí odkaz:
http://arxiv.org/abs/1012.0998
Publikováno v:
Astrophys.J.698:99-105,2009
We present results from a 200 ks Suzaku observation of 1H 0419-577 taken during 2007 July. The source shows a strong excess of counts above 10 keV compared to the extrapolation of models based on previous data in the 0.5-10 keV band. The 'hard excess
Externí odkaz:
http://arxiv.org/abs/0903.4347
Autor:
Nandra, K., Aird, J. A., Alexander, D. M., Ballantyne, D. R., Barcons, X., Bauer, F. E., Boller, T., Brandt, W. N., Brusa, M., Cattaneo, A., Chartas, G., Coil, A. L., Comastri, A., Croton, D. J., Della Ceca, R., Dickinson, M., Fabian, A. C., Fazio, G. G., Fiore, F., Flanagan, K. A., Forman, W. R., Gehrels, N., Georgakakis, A., Georgantopoulos, I., Gilli, R., Hasinger, G., Hopkins, P. F., Hornschemeier, A. E., Ivison, R. J., Kauffmann, G., King, A. R., Koekemoer, A. M., Koo, D. C., Kunieda, H., Laird, E. S., Levenson, N. A., Li, Y., Madau, P., Ohashi, T., Pounds, K. A., Primack, J. R., Ranalli, P., Ricker, G. R., Rossi, E. M., Shemmer, O., Somerville, R. S., Stern, D., Stiavelli, M., Tananbaum, H., Terashima, Y., Treister, E., Ueda, Y., Vignali, C., Volonteri, M., Watson, M. G., White, N. E., White, S. D. M.
One of the main themes in extragalactic astronomy for the next decade will be the evolution of galaxies over cosmic time. Many future observatories, including JWST, ALMA, GMT, TMT and E-ELT will intensively observe starlight over a broad redshift ran
Externí odkaz:
http://arxiv.org/abs/0903.0547
Autor:
Pounds, K. A., Reeves, J. N.
We report two new XMM-Newton observations of PG1211+143 in December 2007, again finding evidence of the fast outflow of highly ionised gas first detected in 2001. Stacking the new spectra with those from two earlier XMM-Newton observations reveals st
Externí odkaz:
http://arxiv.org/abs/0811.3108