Search Publications
XMM-Newton discovery of transient X-ray pulsar in NGC 1313
Trudolyubov, S. P.
We report on the discovery and analysis of the transient X-ray pulsar XMMU J031747.5-663010 detected in the 2004 November 23 XMM-Newton observation of the spiral galaxy NGC 1313. The X-ray source exhibits pulsations with a period P ~ 765.6 s and a nearly sinusoidal pulse shape and pulsed fraction ~38 per cent in the 0.3-7 keV energy range. The X-r…
Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions
Lipski, Ł.; Stȩpień, K.
New determinations of effective temperatures of 23 magnetic, chemically peculiar (mCP) stars were obtained from a fit of metal-enhanced model atmospheres to the observed spectral energy distributions (SED) from ultraviolet (UV) to red. Temperatures of four more CP stars without magnetic measurements were also obtained, of which three show light va…
Multiwavelength study of a young open cluster NGC7419
Pandey, J. C.; Singh, K. P.; Sharma, Saurabh +3 more
Using new UBVRIHα CCD photometric observations and the archival infrared and X-ray data, we have carried out a multiwavelength study of a Perseus arm young open star cluster NGC7419. An age of 22.5 +/- 3.0Myr and a distance of 3230+330-430pc are derived for the cluster. Our photometric data indicate a higher value of colour e…
Photometric redshifts with surface brightness priors
Connolly, Andrew; Jain, Bhuvnesh; Stabenau, Hans F.
We use galaxy surface brightness as prior information to improve photometric redshift (photo-z) estimation. We apply our template-based photo-z method to imaging data from the ground-based VVDS survey and the space-based GOODS field from HST, and use spectroscopic redshifts to test our photometric redshifts for different galaxy types and redshifts…
Diverse young stellar populations in the intermediate-redshift radio galaxies 3C 213.1 and 3C 459: implications for the evolution of the host galaxies
Morganti, R.; Inskip, K. J.; Holt, J. +4 more
We present European Southern Observatory Very Large Telescope (ESO VLT) and William Herschel Telescope (WHT) spectroscopic observations of two powerful radio galaxies at intermediate redshifts (3C 213.1 and 3C 459), obtained with the aim of establishing the nature and evolutionary status of the host galaxies. Spectral synthesis modelling has been …
The central region of M83
Houghton, R. C. W.; Thatte, N.
We combine VLT/ISAAC near-infrared (NIR) spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20 × 20arcsec2 of M83. Our NIR indices for clusters in the circumnuclear starburst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myr …
Spatial and temporal variations in interstellar absorption towards HD 72127AB
Welty, Daniel E.; Hobbs, L. M.; Simon, Thuso
New optical spectra of CaII and NaI towards HD 72127AB provide additional evidence for both spatial and temporal variations in the complex interstellar absorption along the two sightlines; archival ultraviolet spectra yield information on the abundances, depletions and physical conditions in the gas towards HD 72127A. Similarities in the strengths…
An infrared study of the double nucleus in NGC3256
Hoyer, S.; Ward, M.; Lira, P. +1 more
We present new resolved near- and mid-infrared (mid-IR) imaging and N-band spectroscopy of the two nuclei in the merger system NGC3256, the most IR luminous galaxy in the nearby Universe. The results from the spectral energy distribution fit to the data are consistent with previous estimates of the amount of obscuration towards the nuclei and the …
Probing the slope of cluster mass profile with gravitational Einstein rings: application to Abell 1689
Jullo, E.; Fort, B.; Richard, J. +5 more
The strong lensing modelling of gravitational 'rings' formed around massive galaxies is sensitive to the amplitude of the external shear and convergence produced by nearby mass condensations. In current wide-field surveys, it is now possible to find out a large number of rings, typically 10 gravitational rings per square degree. We propose here, t…
M dwarfs at large heliocentric distances
Lehnert, Matthew D.; Stanway, Elizabeth R.; Bremer, Malcolm N. +1 more
We present an analysis of the faint M star population seen as foreground contaminants in deep extragalactic surveys. We use space-based data to separate such stars from high-redshift galaxies in a publicly available data set, and consider the photometric properties of the resulting sample in the optical and infrared. The inferred distances place t…