W
W. Yuan
Researcher at University of Cambridge
Publications - 8
Citations - 709
W. Yuan is an academic researcher from University of Cambridge. The author has contributed to research in topics: Quasar & Redshift. The author has an hindex of 4, co-authored 8 publications receiving 699 citations.
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Journal ArticleDOI
The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue
M. G. Watson,A. C. Schröder,D. Fyfe,Clive G. Page,Georg Lamer,Silvia Mateos,John P. Pye,Masaaki Sakano,Stuart Rosen,J. Ballet,Xavier Barcons,Didier Barret,Th. Boller,Hermann Brunner,Marcella Brusa,A. Caccianiga,Francisco J. Carrera,María Teresa Ceballos,R. Della Ceca,M. Denby,G. Denkinson,S. Dupuy,Sean Farrell,Federico Fraschetti,Michael Freyberg,P. Guillout,Valeri Hambaryan,Tommaso Maccacaro,B. Mathiesen,Richard G. McMahon,Laurent Michel,Christian Motch,J. P. Osborne,M. J. Page,M. W. Pakull,Wolfgang Pietsch,R. D. Saxton,Axel Schwope,P. Severgnini,M. Simpson,G. Sironi,G. Sironi,G. C. Stewart,Ian M. Stewart,Ian M. Stewart,A. M. Stobbart,Jonathan Tedds,R. S. Warwick,N. A. Webb,Richard G. West,Diana M Worrall,W. Yuan +51 more
TL;DR: The 2XMM catalogue as mentioned in this paper is the largest ever made at X-ray wavelengths, containing 246 897 detections drawn from 3491 public XMM-Newton observations over a 7-year interval, which relate to 191 870 unique sources.
Journal ArticleDOI
X-ray spectral properties of high-redshift radio-loud quasars beyond redshift 4 - first results *
TL;DR: In this paper, the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z > 4.
Journal ArticleDOI
XMM observations of the high-redshift quasar RXJ1028.6 - 0844 at z= 4.276: soft X-ray spectral flattening
TL;DR: In this paper, the soft X-ray spectral flattening, as reported by a previous study with ASCA, is confirmed to be present, with, however, a reduced column density when modelled by absorption.
Journal ArticleDOI
Discovery of high-amplitude X-ray variability in the Seyfert-LINER transition galaxy NGC 7589
TL;DR: In this article, an increase in X-ray flux by a factor >10 was discovered from the nucleus of the galaxy NGC 7589 on a time-scale of less than 5 years.
Journal ArticleDOI
A systematic search of highly variable X-ray sources with the XMM-Newton serendipitous survey
TL;DR: Komossa et al. as discussed by the authors describe an ongoing program to search for X-ray sources with long-term, large amplitude x-ray variability, such as supermassive black holes at the centers of nearby, non-active galaxies.