Search Publications
Circumstellar interaction of the type Ia supernova 2002ic
Lundqvist, P.; Chevalier, R. A.; Chugai, N. N.
We propose a model to account for the bolometric light curve, the quasi-continuum and the CaII emission features of the peculiar type Ia supernova (SN) 2002ic, which exploded in a dense circumstellar envelope. The model suggests that the SN Ia had the maximum possible kinetic energy and that the ejecta expand in an approximately spherically symmet…
The stellar composition of the star formation region CMa R1 - III. A new outburst of the Be star component in Z CMa
van den Ancker, M. E.; Acke, B.; Tjin A Djie, H. R. E. +5 more
We report on a recent event in which, after more than a decade of slow fading, the visual brightness of the massive young binary Z CMa suddenly started to rise by about 1 mag in 1999 December, followed by a rapid decline to its previous brightness over the next six months. This behaviour is similar to that exhibited by this system around its erupt…
The complex soft X-ray spectrum of NGC 4151
Schurch, N. J.; Warwick, R. S.; Kahn, S. M. +1 more
We present a detailed analysis of the complex soft X-ray spectrum of NGC 4151 measured by the RGS instruments on board XMM-Newton. The XMM-Newton RGS spectra demonstrate that the soft X-ray emission is extremely rich in X-ray emission lines and radiative recombination continua (RRC), with no clear evidence for any underlying continuum emission. Li…
The XMM-Newton view of the broad-line radio galaxy 3C 120
Iwasawa, K.; Fabian, A. C.; Ballantyne, D. R.
We present the results of a 127-ks XMM-Newton observation of the broad-line radio galaxy 3C 120 performed simultaneously with RXTE. The data have yielded the highest quality 0.6-10 keV spectrum of a radio-loud active galaxy ever produced. The time-averaged spectrum is Seyfert-like, with a reflection amplitude R~ 0.5, and a neutral Fe Kα line with …
XMM-Newton observations of GB B1428+4217: confirmation of intrinsic soft X-ray absorption
Iwasawa, K.; Fabian, A. C.; Celotti, A. +1 more
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 observations. At hard X-ray energies, the spectrum is consistent with a power law, although we …
XMM-Newton observations of high-luminosity radio-quiet quasi-stellar objects
O'Brien, P. T.; Worrall, D. M.; Reeves, J. N. +2 more
XMM-Newton observations of five high-luminosity radio-quiet quasi-stellar objects (QSOs; Q 0144-3938, UM 269, PG 1634+706, SBS 0909+532 and PG 1247+267) are presented. Spectral energy distributions were calculated from the XMM-Newton European Photon Imaging Camera (EPIC) and Optical Monitor (OM) data, with bolometric luminosities estimated in the …
XMM-Newton observations of seven soft X-ray excess quasi-stellar objects
Schartel, N.; O'Brien, P. T.; Page, K. L. +1 more
XMM-Newton observations of seven quasi-stellar objects (QSOs) are presented and the EPIC spectra analysed. Five of the active galactic nuclei (AGN) show evidence for Fe Kα emission, with three being slightly better fitted by lines of finite width; at the 99 per cent level they are consistent with being intrinsically narrow, though. The broad-band …
XMM-Newton observations of 3C 273
Done, C.; O'Brien, P. T.; Reeves, J. N. +4 more
A series of nine XMM-Newton observations of the radio-loud quasar 3C 273 are presented, concentrating mainly on the soft excess. Although most of the individual observations do not show evidence for iron emission, co-adding them reveals a weak, broad line (EW ~56 eV). The soft excess component is found to vary, confirming previous work, and can be…
Complex X-ray spectral behaviour of NGC 4051 in the low flux state
Page, M. J.; Uttley, P.; Mason, K. O. +4 more
The narrow-line Seyfert 1 galaxy, NGC 4051, was observed in one of its prolonged low flux states by XMM-Newton in 2002 November. Here we present the results of an analysis of the European Photon Imaging Camera (EPIC) pn data obtained during the observation. Within the low state, the source shows complex spectral variability which cannot easily be …
The XMM-Newton/2dF survey - II. The nature of X-ray-faint optically bright X-ray sources
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +6 more
In this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide-area (2.5 deg2) shallow [fX(0.5-8 keV) ~ 10-14 erg s-1 cm-2]XMM-Newton survey. We find a total of 26 sources (5 per cent of the total X-ray-selected population) with log fX/f