Search Publications
The X-ray variability of the narrow-line type 1 Seyfert galaxy IRAS 13224-3809 from an XMM-Newton observation
Brandt, W. N.; Fabian, A. C.; Boller, Th. +5 more
We report on the XMM-Newton timing properties of the most X-ray variable, radio-quiet, narrow-line type 1 Seyfert galaxy IRAS 13224-3809. IRAS 13224-3809 continues to display the extremely variable behaviour that was previously observed with ROSAT and ASCA; however, no giant, rapid flaring events are observed. We detect variations by a factor as h…
Nuclear stellar discs in low-luminosity elliptical galaxies: NGC 4458 and 4478
Halliday, C.; Saglia, R. P.; Morelli, L. +7 more
We present the detection of nuclear stellar discs in the low-luminosity elliptical galaxies, NGC 4458 and 4478, which are known to host a kinematically decoupled core. Using archival Hubble Space Telescope imaging, and available absorption line-strength index data based on ground-based spectroscopy, we investigate the photometric parameters and th…
A dipping black hole X-ray binary candidate in NGC 55
Warwick, R. S.; Roberts, T. P.; Stobbart, A. -M.
XMM-Newton European Photon Imaging Camera (EPIC) observations have revealed a bright point-like X-ray source in the nearby Magellanic-type galaxy NGC 55. At the distance of NGC 55, the maximum observed X-ray luminosity of the source, designated as XMMU J001528.9 - 391319, is Lx ~ 1.6 × 1039 erg s-1, placing the obj…
XMM-Newton and Chandra observations of three X-ray-faint early-type galaxies
O'Sullivan, E.; Ponman, T. J.
We present XMM-Newton observations of three X-ray-underluminous elliptical galaxies, NGC 3585, 4494 and 5322. All three galaxies have relatively large optical luminosities (logLB= 10.35-10.67 Lsolar) but have X-ray luminosities consistent with emission from discrete sources only. In conjunction with a Chandra observation of N…
An XMM-Newton observation of the massive, relaxed galaxy cluster ClJ1226.9+3332 at z= 0.89
Maughan, B. J.; Ebeling, H.; Jones, L. R. +1 more
A detailed X-ray analysis of an XMM-Newton observation of the high-redshift (z= 0.89) galaxy cluster ClJ1226.9+3332 is presented. After careful consideration of background subtraction issues, the X-ray temperature is found to be 11.5+1.1-0.9 keV, the highest X-ray temperature of any cluster at z > 0.6. The temperature is c…
Observations and three-dimensional photoionization modelling of the Wolf-Rayet planetary nebula NGC 1501
Rauch, T.; Barlow, M. J.; Zhang, Y. +4 more
Deep optical spectra of the high-excitation planetary nebula NGC 1501 and its W04 central star are presented. A recombination line abundance analysis of the emission-line spectrum of the central star yields He:C:O mass fractions of 0.36:0.48:0.16, similar to those of PG 1159 stars. A detailed empirical analysis of the nebular collisionally excited…
Chandra and XMM-Newton observations of NGC 5253: analysis of the X-ray emission from a dwarf starburst galaxy
Heckman, Timothy M.; Stevens, Ian R.; Strickland, David K. +1 more
We present Chandra and XMM-Newton X-ray data of NGC 5253, a local starbursting dwarf elliptical galaxy, in the early stages of a starburst episode. Contributions to the X-ray emission come from discrete point sources and extended diffuse emission, in the form of what appear to be multiple superbubbles, and smaller bubbles probably associated with …
A faint red stellar halo around an edge-on disc galaxy in the Hubble Ultra Deep Field
Zibetti, Stefano; Ferguson, Annette M. N.
We analyse the detailed structure of a highly-inclined (i>~ 80°) disc galaxy that lies within the Hubble Ultra Deep Field (UDF). The unprecedented depth of the UDF data allow disc and extraplanar emission to be traced reliably to surface brightness levels of µV,i,z~ 29-30 mag arcsec-2 (corresponding to rest-frame equ…
On the deep minimum state in the Seyfert galaxy MCG-6-30-15
Staubert, Rüdiger; Wilms, Jörn; Reynolds, Christopher S. +2 more
We present a detailed spectral analysis of the first observation of the Seyfert 1 galaxy MCG-6-30-15 by the European Photon Imaging Camera on board the XMM-Newton observatory, together with contemporaneous data from the Proportional Counter Array on the Rossi X-ray Timing Explorer. Confirming our previously published result, we find that the prese…
Unveiling the nature of the highly obscured active galactic nucleus in NGC 5643 with XMM-Newton
Guainazzi, M.; Iwasawa, K.; Fabian, A. C. +2 more
We present results from an XMM-Newton observation of the nearby Seyfert 2 galaxy NGC 5643. The nucleus exhibits a very flat X-ray continuum above 2 keV, together with a prominent Kα fluorescent iron line. This indicates heavy obscuration. We measure an absorbing column density NH in the range 6-10 × 1023 cm-2, eith…