Search Publications
XMM-Newton observations of the interacting galaxy pairs NGC 7771/0 and NGC 2342/1
Zezas, A.; Roberts, T. P.; Ward, M. J. +1 more
We present XMM-Newton X-ray observations of the interacting galaxy pairs NGC 7771/7770 and NGC 2342/2341. In NGC 7771, for the first time we are able to resolve the X-ray emission into a bright central source plus two bright (LX > 1040 erg s-1) ultraluminous X-ray sources (ULXs) located either end of the bar. In…
High-resolution extreme ultraviolet spectroscopy of G191-B2B: structure of the stellar photosphere and the surrounding interstellar medium
Dreizler, S.; Barstow, M. A.; Hubeny, I. +8 more
We have continued our detailed analysis of the high-resolution (R= 4000) spectroscopic observation of the DA white dwarf G191-B2B, obtained by the Joint Astrophysical Plasmadynamic Experiment (J-PEX) normal incidence sounding rocket-borne telescope, comparing the observed data with theoretical predictions for both homogeneous and stratified atmosp…
On the X-ray properties of OH megamaser sources: Chandra snapshot observations
Brandt, William N.; Comastri, Andrea; Vignali, Cristian +1 more
We present Chandra snapshot observations for a sample of seven sources selected from the Arecibo OH megamaser (OHM) survey at z~ 0.13-0.22 and with far-infrared (FIR) luminosities in excess of 1011Lsolar. In contrast with the known H2O megamasers, which are mostly associated with powerful active galactic nuclei (AG…
ISO observations of 3-200 µm emission by three dust populations in an isolated local translucent cloud
Juvela, M.; Lemke, D.; Lehtinen, K. +2 more
We present ISOPHOT spectrophotometry of three positions within the isolated high-latitude cirrus cloud G 300.2-16.8, spanning from the near- to far-infrared (NIR to FIR). The positions exhibit contrasting emission spectrum contributions from the unidentified infrared bands (UIBs), very small grains (VSGs) and large classical grains, and both semi-…
The INTEGRAL spectrometer SPI: performance of point-source data analysis
Knödlseder, J.; von Kienlin, A.; Bouchet, L. +9 more
The performance of the SPI point-source data analysis system is assessed using a combination of simulations and of observations gathered during the first year of INTEGRAL operations. External error estimates are derived by comparing source positions and fluxes obtained from independent analyses. When the source detection significance provided by t…
Kinematics of ionized gas in the barred Seyfert galaxy NGC 4151
Mundell, C. G.; Pedlar, A.; Asif, M. W.
We have determined the structure and kinematics of ionized gas in the weak oval bar of the archetypal Seyfert 1 galaxy, NGC 4151, using the TAURUS Fabry-Perot interferometer to simultaneously map the distribution and kinematics of Hβ emission. We also present broad-band ultraviolet imaging of the host galaxy, obtained with XMM-Newton, which shows …
Cold dust in (some) high-z supernova host galaxies
Clements, D. L.; Farrah, D.; Fox, M. +3 more
We present deep submillimetre photometry for 14 galaxies at z= 0.5 that are hosts of Type Ia supernovae, with the aim of examining the evolution of dust mass and extinction in normal galaxies. We combine these results with our previous observations of 17 z~ 0.5 SN1a hosts to look for any evolution in the dust content of normal galaxies between z= …
Erratum: A high-velocity ionized outflow and XUV photosphere in the narrow emission line quasar PG1211+143
O'Brien, P. T.; King, A. R.; Reeves, J. N. +3 more
HT Camelopardalis: the simplest intermediate polar spin pulse
Hellier, Coel; Evans, P. A.
The intermediate polar (IP) HT Cam is unusual in that it shows no evidence for dense absorption in its spectrum. We analyse an XMM-Newton observation of this star, which confirms the absence of absorption and shows that the X-ray spin pulse is energy independent. The modulation arises solely from occultation effects and can be reproduced by a simp…
GRB 050223: a faint gamma-ray burst discovered by Swift
Campana, S.; Tagliaferri, G.; Cusumano, G. +16 more
GRB 050223 was discovered by the Swift Gamma-Ray Burst Explorer on 2005 February 23 and was the first gamma-ray burst (GRB) to be observed by both Swift and XMM-Newton. At the time of writing (2005 May), it has one of the faintest GRB afterglows ever observed. The spacecraft could not slew immediately to the burst, so the first X-ray and optical o…