Zobrazeno 1 - 10
of 255
pro vyhledávání: '"George, I. M."'
Autor:
Giustini, M., Turner, T. J., Reeves, J. N., Miller, L., Legg, E., Kraemer, S. B., George, I. M.
Publikováno v:
A&A 577, A8 (2015)
Ark 564 (z=0.0247) is an X-ray-bright NLS1. By using advanced X-ray timing techniques, an excess of "delayed" emission in the hard X-ray band (4-7.5 keV) following about 1000 seconds after "flaring" light in the soft X-ray band (0.4-1 keV) was recent
Externí odkaz:
http://arxiv.org/abs/1502.01338
Autor:
Markowitz, A., Reeves, J. N., George, I. M., Braito, V., Smith, R., Vaughan, S., Arévalo, P., Tombesi, F.
Publikováno v:
Astrophys.J.691:922-945,2009
We present results of a 100 ks XMM observation of the Seyfert 1.5 NGC 3227. Our best-fit broadband model to the pn spectrum consists of a moderately flat (photon index 1.57) hard X-ray power-law absorbed by cold gas with N_H = 3 * 10^21 cm^-2, plus a
Externí odkaz:
http://arxiv.org/abs/0810.1249
We present an analysis of the X-ray spectra of a sample of 37 observations of 26 Seyfert galaxies observed by XMM-Newton in order to characterize their iron K emission. All objects show evidence for iron line emission in the 6-7 keV band. A narrow co
Externí odkaz:
http://arxiv.org/abs/0708.1305
Aims: We analyse a long XMM-Newton spectrum of the narrow-line Seyfert 1 galaxy Mrk 766, using the marked spectral variability on timescales >20ks to separate components in the X-ray spectrum. Methods: Principal components analysis is used to identif
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611673
Publikováno v:
Astron.Nachr.327:1039-1042,2006
We report on the iron K-alpha line properties of a sample of Seyfert galaxies observed with the XMM-Newton EPIC pn instrument. Using a systematic and uniform analysis, we find that complexity at iron-K is extremely common in the XMM spectra. Once app
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610585
Autor:
Kraemer, S. B., Crenshaw, D. M., Gabel, J. R., Kriss, G. A., Netzer, H., Peterson, B. M., George, I. M., Gull, T. R., Hutchings, J. B., Mushotzky, R. F., Turner, T. J.
We present a detailed analysis of the intrinsic absorption in the Seyfert 1 galaxy NGC 4151 using UV spectra from the HST/STIS and FUSE, obtained 2002 May as part of a set of contemporaneous observations that included Chandra/HETGS spectra. In our an
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608383
Autor:
Miller, L., Turner, T. J., Reeves, J. N., George, I. M., Porquet, D., Nandra, K., Dovciak, M.
Publikováno v:
Astron.Astrophys. 453 (2006) L13
We investigate the link between ionised Fe X-ray line emission and continuum emission in the bright nearby AGN, Mrk 766. A new long (433 ks) XMM-Newton observation is analysed, together with archival data from 2000 and 2001. The contribution from ion
Externí odkaz:
http://arxiv.org/abs/astro-ph/0605130
Autor:
Steenbrugge, K. C., Kaastra, J. S., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., Paerels, F. B. S., Turner, T. J., Yaqoob, T.
We present the results from our 140 ks XMM-Newton and 500 ks Chandra observation of NGC 5548. The velocity structure of the X-ray absorber is consistent with the velocity structure measured in the simultaneous UV spectra. In the X-rays we can separat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0511236
Autor:
Reeves, J. N., Pounds, K., Uttley, P., Kraemer, S., Mushotzky, R, Yaqoob, T., George, I. M., Turner, T. J.
Publikováno v:
Astrophys.J.633:L81-L84,2005
We report the detection of redshifted iron K-alpha absorption lines in the Chandra LETG spectrum of the narrow-line quasar, PG 1211+143. The absorption lines are observed at 4.22 keV and 4.93 keV in the quasar spectrum, corresponding to 4.56 keV and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509280
Autor:
Kraemer, S. B., George, I. M., Crenshaw, D. M., Gabel, J. R., Turner, T. J., Gull, T. R., Hutchings, J. B., Kriss, G. A., Mushotzky, R. F., Netzer, H., Peterson, B. M., Behar, Ehud
Publikováno v:
Astrophys.J.633:693-705,2005
We present a detailed analysis of the intrinsic X-ray absorption in the Seyfert 1 galaxy NGC 4151 using Chandra/HETGS data obtained 2002 May, as part of a program which included simultaneous UV spectra using HST/STIS and FUSE. NGC 4151 was in a relat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507354