Search Publications
A broad-band spectral analysis of eight radio-loud type 1 active galactic nuclei selected in the hard X-ray band
de Rosa, A.; Bird, A. J.; Fiocchi, M. +6 more
Starting from a complete sample of type 1 active galactic nuclei (AGN) observed by INTEGRAL in the 20-40 keV band, we have selected a set of eight AGN which can be classified as radio-loud objects according to their 1.4 GHz power density, radio-to-hard X-ray flux density ratio and radio morphology. The sample contains six broad-line radio Galaxies…
Limits on the X-ray and optical luminosity of the progenitor of the Type Ia supernova 2007sr
Bassa, Cees; Nelemans, Gijs; Voss, Rasmus +1 more
We present Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2), Galaxy Evolution Explorer (GALEX) and Chandra observations of the position of the Type Ia supernova 2007sr in the Antennae galaxy, taken before the explosion. No source is found in any of the observations, allowing us to put interesting constraints on the progenitor lum…
[OIII] emitters in the field of the MRC0316-257 protocluster
Pentericci, L.; Rosati, P.; Stanford, S. A. +12 more
Venemans et al. found evidence for an overdensity of Lyα emission-line galaxies associated with the radio galaxy MRC0316-257 at z = 3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and active galactic nucleus (AGN) within the protocluster. Narrow-band infrared ima…
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…