Search Publications

Interstellar Silicon Abundance

Gnacinski, P.

We present 34 measurements of silicon gas phase column densities in the interstellar medium. We have used spectra containing the SiII 1808 Ang line which were obtained with the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope (HST). Extinction curve parameters are determined for analyzed lines of sight and relation bet…

First IBIS results on the high energy emission of Cygnus X-2

Santangelo, A.; Capitanio, F.; Ubertini, P. +4 more

The bright low-mass X-ray binary Cyg X-2 was in the field of view of the IBIS telescope during the early Cygnus region observations, executed during the INTEGRAL Performance Verification Phase. The data presented are spanning about one week and cover the rising edge of one of the two peaks of the ~82 day cycle of the Cyg X-2 light curve. The IBIS …

Multipolar Bubbles, Point-Symmetry, and Jets in Dying Stars

Sahai, R.; Morris, M. R.

The imaging of young planetary and pre-planetary nebulae (YPNe and PPNe) with unprecedented high angular resolution and dynamic range using the Hubble Space Telescope (HST), has shown that most of these objects are highly aspherical, with complex multipolar morphologies. The complexity, organization and symmetry of the morphological structures has…

The mean stellar parameters from IUE and hipparcos data

Niemczura, E.; Cugier, H.; Daszyńska, J.

6C radio galaxies at z∼1: the influence of radio power on the alignment effect

Best, Philip N.; Inskip, Katherine J.; Longair, Malcolm S.

Powerful radio galaxies often display enhanced optical/UV continuum emission and extended emission line regions, elongated and aligned with the radio jet axis. The expansion of the radio source strongly affects the gas clouds in the surrounding IGM, and the kinematic and ionization properties of the extended emission line regions display considera…

Erratum: The ISO-SWS spectrum of planetary nebula NGC 7027

Pottasch, S. R.; Beintema, D. A.; Bernard-Salas, J. +1 more

Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and UK) and with the participation of ISAS and NASA.

Fine structure of the polar cusp as deduced from the plasma wave and plasma measurements

Sauvaud, J. -A.; Santolik, O.; Parrot, M. +7 more

Plasma waves are one of the most significant features of plasma. They are a very sensitive indicator of the boundaries and inner structure of different regions in space plasmas. The data gathered onboard Interball 1 and Magion 4 in the polar cusp indicate that plasma wave intensity changes very rapidly with a characteristic period of the order of …

First far-UV observations of KQ Puppis with FUSE

Rossi, C.; González-Riestra, R.; Viotti, R. F.

We report the first far-ultraviolet spectrum of the emission line spectroscopic binary KQ Pup (M2Iab+B0Ve), obtained with FUSE shortly after conjunction at orbital phase Phi =0.13. The spectrum presents a sharp flux cutoff at 1040 Å; longwards, it is dominated by a large amount of resonant and low excitation transitions of neutral and singly ioniz…

HST/STIS Spectroscopy of CSS sources: Kinematics and Ionisation of the Aligned Nebulae

Capetti, A.; Koekemoer, A. M.; Morganti, R. +9 more

We have obtained long slit spectra of 3C67 and 3C277.1 with the HST/STIS spectrograph. We present our preliminary results on the diagnostic emission line ratios along the radio source axes in 3C67 and 3C277.1.

Hard X-ray observations of Extremely Red Objects

Brusa, M.

Extremely Red Objects (EROs, R-K>5) constitute a heterogeneous class of extragalactic sources including high redshift elliptical galaxies, dusty star-forming systems and heavily obscured AGNs. Hard X-ray observations provide an unique and powerful tool to uncover obscured nuclear or star-forming activity. We present the results of XMM-Newton ob…