We present long-slit, optical spectra of the merging system Arp220, obtained using the William Herschel Telescope (WHT) on La Palma. These data were taken as a part of a large study of ultraluminous infrared galaxies (ULIRGs) with the aim of investigating the evolution and star formation histories of such objects. Spectral synthesis modelling has

There is not as yet full agreement on the mechanism that causes the rapid damping of the oscillations observed by TRACE in coronal loops. It has been suggested that the variation of the observed values of the damping time as function of the corresponding observed values of the period contains information on the possible damping mechanism. The aim

Our neighbouring galaxy M31 (Andromeda), located 780 kpc away, offers a unique opportunity to study the X-ray population of a galaxy similar to the Milky Way. We have concentrated our monitoring campaign on following the X-ray activity of the stellar-mass black hole candidates, XRNe (X-Ray Novae), in the central region of M31. Observations are made

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We use the Palomar Observatory Wide-field Infrared (POWIR)/DEEP-2 survey (Davis et al., 2003, SPIE, Vol. 4834, p. 161; Bundy et al., 2006ApJ...651..120B ; Conselice et al., 2007ApJ...660L..55C, 2007MNRAS.381..962C) to define a sample of 831 galaxies with masses larger than 1011h70-2M{sun} located over ~710arcmin2 in the Extended Groth Strip (EGS)