Zobrazeno 1 - 10
of 473
pro vyhledávání: '"Worsley M"'
Publikováno v:
Mon.Not.Roy.Astron.Soc.368:1735-1741,2006
The emission from individual X-ray sources in the Chandra Deep Fields and XMM-Newton Lockman Hole shows that almost half of the hard X-ray background above 6 keV is unresolved and implies the existence of a missing population of heavily obscured acti
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602605
Publikováno v:
Mon.Not.Roy.Astron.Soc.368:844-850,2006
We report on the extreme behaviour of the high redshift blazar GB B1428+4217 at z=4.72. A continued programme of radio measurements has revealed an exceptional flare in the lightcurve, with the 15.2 GHz flux density rising by a factor ~3 from ~140 mJ
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602355
Publikováno v:
Mon.Not.Roy.Astron.Soc.368:985,2006
(abridged) We firstly present the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z>4. These observations more than double the number of z>4 radio-loud quasars having X-ray spectroscopic data t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602272
Autor:
Worsley, M. A., Fabian, A. C., Bauer, F. E., Alexander, D. M., Hasinger, G., Mateos, S., Brunner, H., Brandt, W. N., Schneider, D. P.
Publikováno v:
Mon.Not.Roy.Astron.Soc.357:1281-1287,2005
We extend our earlier work on X-ray source stacking in the deep XMM-Newton observation of the Lockman Hole, to the 2 Ms Chandra Deep Field North and the 1 Ms Chandra Deep Field South. The XMM-Newton work showed the resolved fraction of the X-ray back
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412266
Autor:
Fabian, A. C., Worsley, M. A.
The X-ray Background has been resolved in the 0.5-5keV band and found to consist mostly of both unabsorbed and absorbed AGN with column densities <1e23. This contrasts with the local AGN population where the column density range extends to Compton-th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0410589
Publikováno v:
Mon.Not.Roy.Astron.Soc.352:L28,2004
Most of the soft and a growing fraction of the harder X-ray background has been resolved into emission from point sources, yet the resolved fraction above 7 keV has only been poorly constrained. We use ~700 ks of XMM-Newton observations of the Lockma
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404273
Publikováno v:
Mon.Not.Roy.Astron.Soc.350:L67-L71,2004
We report the results of XMM-Newton observations of the X-ray bright, radio-loud blazar GB B1428+4217 at a redshift of z=4.72. We confirm the presence of soft X-ray spectral flattening at energies <0.7 keV as reported in previous ROSAT and BeppoSAX o
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403601
Publikováno v:
Mon.Not.Roy.Astron.Soc.350:207-212,2004
We present the analysis and results from a series of XMM-Newton observations of the distant blazar PMN J0525-3343, at a redshift of 4.4. The X-ray spectrum shows a spectral flattening below ~1 keV confirming earlier results from ASCA and BeppoSAX. Th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310366
Akademický článek
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Medical implants are routinely tracked and monitored using different techniques, such as MRI, X‐ray, and ultrasound. Due to the need for ionizing radiation, the two former methods pose a significant risk to tissue. Ultrasound imaging, however, is n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::3df502be99c305af3b9f6ccd11d63c02
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3025469
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3025469