Search Publications
The red and blue galaxy populations in the GOODS field: evidence for an excess of red dwarfs
Castellano, M.; Pentericci, L.; Fontana, A. +8 more
Aims: We study the evolution of the galaxy population up to z∼ 3 as a function of its colour properties. In particular, luminosity functions and luminosity densities were derived as a function of redshift for the blue/late and red/early populations.
Methods: We use data from the GOODS-MUSIC catalogue, which have typical magnitude limits z…
Extremely massive young clusters in NGC 1365
Pantin, E.; Panuzzo, P.; Alloin, D. +5 more
Context: In a previous work, three bright mid-infrared/radio sources were discovered in the nuclear region of starburst/AGN galaxy NGC 1365.
Aims: The present study aims to confirm that these sources are indeed young and massive “embedded” clusters, and derive their physical parameters, such as extinction, age and mass.
Methods: Using ISAA…
CME liftoff with high-frequency fragmented type II burst emission
Vainio, R.; Pomoell, J.; Pohjolainen, S.
Aims: Solar radio type II bursts are rarely seen at frequencies higher than a few hundred MHz. Since metric type II bursts are thought to be signatures of propagating shock waves, it is of interest to know how these shocks, and the type II bursts, are formed. In particular, how are high-frequency, fragmented type II bursts created? Are there diffe…
Abundances of planetary nebula NGC 2392
Pottasch, S. R.; Bernard-Salas, J.; Roellig, T. L.
The spectra of the planetary nebula
Infrared to X-ray observations of PKS 2155-304 in a low state
Maraschi, L.; Covino, S.; Tagliaferri, G. +14 more
Aims: Our goal is to understand the nature of blazars and the mechanisms for the generation of high-energy γ-rays, through the investigation of the prototypical blazar PKS 2155{-}304, which shows complex behaviour.
Methods: We analyze simultaneous infrared-to-X-ray observations obtained with XMM-Newton and REM on November 7, 2006, when the sou…
Star cluster versus field star formation in the nucleus of the prototype starburst galaxy M 82
de Grijs, R.; Cerviño, M.; Barker, S.
We analyse high-resolution Hubble Space Telescope/Advanced Camera for Surveys imaging of the nuclear starburst region of M 82, obtained as part of the Hubble Heritage mosaic made of this galaxy, in four filters (Johnson-Cousins equivalent B, V, and I broad bands, and an Hα narrow-band filter), as well as subsequently acquired U-band images. We fin…
Time variability of X-ray sources in the M 31 centre field
Stiele, H.; Pietsch, W.; Haberl, F. +1 more
Aims:We present an extension to our XMM-Newton X-ray source catalogue of
Methods: As a source list we used our extended ca…
Asteroid 2867 Steins. III. Spitzer Space Telescope observations, size determination, and thermal properties
Jorda, L.; Lamy, P. L.; Barucci, M. A. +6 more
Context: Asteroid 2867 Steins is the first target of the Rosetta space mission with a flyby scheduled in September 2008.
Aims: An early characterization is needed to optimize the flyby parameters and the science operations, and to maximize the scientific return.
Methods: We used the infrared spectrograph (IRS) of the Spitzer Space Telescop…
Spectroscopy and multiband photometry of the afterglow of intermediate duration γ-ray burst GRB 040924 and its host galaxy
Hornstrup, A.; Vreeswijk, P. M.; Wijers, R. A. M. J. +19 more
Aims: We present optical photometry and spectroscopy of the afterglow and host galaxy of gamma-ray burst GRB 040924. This GRB had a rather short duration of T90 ~2.4 s, and a well sampled optical afterglow light curve. We aim to use this dataset to find further evidence that this burst is consistent with a massive star core-collapse pro…
The serendipituous discovery of a short-period eclipsing polar in 2XMMp
Watson, M. G.; Schwope, A.; Osborne, J. P. +3 more
We report the serendipituous discovery of the new eclipsing polar 2XMMp J131223.4+173659. Its striking X-ray light curve attracted immediate interest when we were visually inspecting the source products of the 2XMMp catalogue. This light curve revealed its likely nature as a magnetic cataclysmic variable of AM Herculis (or polar) type with an orbi…