Search Publications
A complete view of the broad-line radio galaxy 4C +74.26 with XMM-Newton
Ballantyne, D. R.
This paper presents a timing study and broad-band spectral analysis of the broad-line radio galaxy 4C +74.26 based on a 35-ks XMM-Newton observation. As found in previous data sets, the source exhibits no evidence for rapid variability, and its 0.2-10 keV light curve is well fitted by a constant. An excellent fit to the pn 0.3-12 keV spectrum was …
Determination of Cepheid parameters by light-curve template fitting
Berdnikov, L. N.; Tanvir, N. R.; Ngeow, C. C. +3 more
We describe techniques to characterize the light curves of regular variable stars by applying principal component analysis (PCA) to a training set of high-quality data, and to fit the resulting light-curve templates to sparse and noisy photometry to obtain parameters such as periods, mean magnitudes etc. The PCA approach allows us to efficiently r…
High-resolution observations of SN 2001gd in NGC 5033
Lundqvist, P.; Ros, E.; Guerrero, M. A. +8 more
We report on 8.4-GHz very-long-baseline interferometry (VLBI) observations of SN 2001gd in the spiral galaxy NGC 5033 made on 2002 June 26 (2002.48) and 2003 April 8 (2003.27). We used the interferometric visibility data to estimate angular diameter sizes for the supernova by model fitting. Our data nominally suggest a relatively strong decelerati…
The X-ray spectrum of NGC 7213 and the Seyfert-LINER connection
Page, M. J.; Branduardi-Raymont, G.; Soria, R. +3 more
We present an XMM-Newton observation of the Seyfert-LINER (low-ionization nuclear emission-line region) galaxy NGC 7213. The RGS soft X-ray spectrum is well fitted with a power law plus soft X-ray collisionally ionized thermal plasma (kT= 0.18+0.03-0.01 keV). We confirm the presence of FeI, FeXXV and FeXXVI Kα emission in the…
XMM-Newton surveys of the Canada-France Redshift Survey Fields - III. The environments of X-ray selected active galactic nuclei at 0.4 < z < 0.6
Lilly, S.; McCracken, H. J.; Eales, S. A. +3 more
The environmental properties of a sample of 31 hard X-ray selected active galactic nuclei (AGN) are investigated, from scales of 500 kpc down to 30 kpc, and are compared to a control sample of inactive galaxies. All the AGN lie in the redshift range 0.4 < z < 0.6. The accretion luminosity density of the Universe peaks close to this redshift …
Correlation patterns between 11 diffuse interstellar bands and ultraviolet extinction
Krełowski, J.; Megier, A.; Weselak, T.
We relate the equivalent widths of 11 diffuse interstellar bands, measured in the spectra of 49 stars, to different colour excesses in the ultraviolet. We find that most of the observed bands correlate positively with the extinction in the neighbourhood of the 2175-Åbump. Correlation with colour excesses in other parts of the extinction curve is m…
Outflowing material in the compact steep-spectrum source quasar 3C 48: evidence of jet-cloud interaction?
Saikia, D. J.; Srianand, R.; Gupta, Neeraj
We report on the detection of a zabs= 0.3654 associated absorption-line system in the ultraviolet spectrum of the compact steep-spectrum source (CSS) quasar 3C 48. The absorbing material is blueshifted with respect to the quasar emission-line redshift, zem= 0.3700, suggesting an outflow velocity of ~1000 km s-1. We…
Properties of FIRBACK-ELAIS 175-µm sources in the ELAIS N2 region
Dole, H.; Lagache, G.; Puget, J. -L. +15 more
We report on a search for the optical counterparts of 175-µm selected sources from the Far-Infrared Background (FIRBACK) survey in the European Large Area ISO Survey (ELAIS) N2 field. Applying a likelihood ratio technique to optical catalogues from the Isaac Newton Telescope - Wide Field Survey (INT-WFS), we found optical identifications for…
Discovery of absorption features of the accretion disc corona and systematic acceleration of the X-ray burst rate in XB1323-619
Church, M. J.; Reed, D.; Dotani, T. +2 more
We present results from analysis of the observation of the dipping, quasi-periodic bursting low mass X-ray binary XB1323-619 made with XMM-Newton in 2003 January. In spectral analysis of the non-dip, non-burst EPIC PN spectrum, a number of absorption lines were discovered, notably at 6.70 and 6.98 keV, which we identify with scattering by high ion…
The European Large Area ISO Survey: optical identifications of 15-µm and 1.4-GHz sources in N1 and N2
Vaccari, M.; Serjeant, S.; Rowan-Robinson, M. +9 more
We present the multiwavelength properties and catalogue of the 15µm and 1.4GHz radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the optical data from the Wide Field Survey we use a likelihood ratio method to search for the counterparts of the 1056 and 691 sources detected at 15µm and 1.4GHz, r…