Search Publications
Near-infrared probing of embedded structures in starburst and Seyfert galaxies
Martinet, L.; Martin, P.; Wozniak, H. +2 more
Surface photometry in the J and K' bands of 15 southern Seyfert or starburst galaxies is presented. The detailed central morphology and structural properties of these objects were analyzed by fitting ellipses to isophotes. New central peculiar structures have been identified like, for instance, three double-barred systems (ESO 215-G031;…
Blind source separation and analysis of multispectral astronomical images
Bijaoui, A.; Nuzillard, D.
Celestial sources are studied by means of multispectral analysis, for which a pixel value can be considered as a mixture of different sources. We show that the application of blind source separation methods can display interesting features, which can help astronomers to improve their description of celestial sources. Experiments were carried out o…
Variable HST guide stars (I)
Zwintz, K.; Frandsen, S.; Kuschnig, R. +4 more
We have performed time series analyses on more than 4500 sets of Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) data, obtained from about 3600 guide stars in the period from August 1992 to December 1995. We discuss here a subset of 20 stars that were found to be variable at a high confidence level. This subset contains all definite variab…
A catalogue of galaxies in the HDF-South: Photometry and structural parameters
Chincarini, G.; Saracco, P.; Volonteri, M.
We describe the construction of a catalogue of galaxies in the optical field of the Hubble Deep Field South. The HDF-S observations produced WFPC2 images in U, B, V, and I, the version 1 data have been made public on 23 November 1999. The effective field of view is 4.38 arcmin2, and the 5sigma limiting magnitudes (in a FWHM aperture) ar…