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Maximum Entropy imaging with INTEGRAL/SPI data
Strong, A. W.
The application of the Maximum Entropy method for sky imaging with the SPI instrument on INTEGRAL is described. While intended primarily for extended emission, point sources are also mapped by this method. The technique is implemented as the program spiskymax in the data analysis distribution provided by the INTEGRAL Science Data Centre. We briefl…
Multisite observations of the PMS delta Scuti star V351 Ori
Ripepi, V.; Palla, F.; Marconi, M. +12 more
We present the results of multisite observations spanning two years on the pre-main-sequence (PMS) star V351 Ori. A total of around 180 hours of observations over 29 nights have been collected, allowing us to measure five different periodicities, most likely related to the delta Scuti variability of V351 Ori. Comparison with the predictions of lin…
Rotation and outflow in the central kiloparsec of the water-megamaser galaxies IC 2560, NGC 1386, NGC 1052, and Mrk 1210
Henkel, C.; Schulz, H.
Optical emission-line profiles were evaluated in order to explore the structure of galactic nuclei containing H2O megamaser sources. Long-slit spectra of IC 2560, NGC 1386, NGC 1052 and Mrk 1210 were obtained at ~ 100 km s-1 spectral and ~ 2arcsec x 2 arcsec spatial resolution. The following individual properties of the objec…
XMM-Newton observation of the interacting cluster Abell 3528
Molendi, S.; Gastaldello, F.; Venturi, T. +3 more
We analyze the XMM-Newton dataset of the interacting cluster of galaxies Abell 3528 located westward in the core of the Shapley Supercluster, the largest concentration of mass in the nearby Universe. A3528 is formed by two interacting clumps (A3528-N at North and A3528-S at South) separated by 0.9 h70-1 Mpc at redshift 0.053.…
HST observations of the metal rich globular clusters NGC 6496 and NGC 6352
Covino, S.; Pulone, L.; Paresce, F. +1 more
Deep exposures of the metal-rich globular clusters NGC 6496 and NGC 6352 were obtained with the WFPC2 camera on board the Hubble Space Telescope (HST) through the F606W and F814W filters. The resulting colour-magnitude diagrams (CMD) reach down to absolute magnitude M814 =~ 10-10.5, approximately 5 magnitudes below the main sequence (MS…
The far-infrared/radio correlation in the ISO era. The warm and cold far-infrared/radio correlations
Völk, H. J.; Tuffs, R. J.; Pierini, D. +1 more
We present the correlation between the far-infrared (FIR) and radio emissions from a composite sample of 72 nearby normal galaxies observed with the ISOPHOT instrument on board the Infrared Space Observatory. The galaxies in the sample have measurements at three FIR wavelengths (60, 100 and 170 mu m), which allowed a direct determination of the wa…
Asteroid observations with the Hubble Space Telescope. II. Duplicity search and size measurements for 6 asteroids
Lattanzi, M.; Tanga, P.; Cellino, A. +3 more
We present the results of the observations of five Main Belt asteroids and one Trojan obtained using the Fine Guidance Sensors (FGS) of the Hubble Space Telescope. For each object, estimates of the spin axis orientation, angular size and overall shape, as well as possible indications of a binary structure, are derived. This enables the computation…
First NACO observations of the Brown Dwarf LHS 2397aB
Bouy, H.; Brandner, W.; Lagrange, A. M. +3 more
Observations of the standard late type M8 star LHS 2397aA were obtained at the ESO-VLT 8 m telescope ``Yepun'' using the NAOS/CONICA Adaptive Optics facility. The observations were taken during the NACO commissioning, and the infrared standard star LHS 2397aA was observed in the H, and Ks broad band filters. In both bands the brown dwarf companion…
Radial velocities of early-type stars in the Perseus OB2 association
Steenbrugge, K. C.; de Bruijne, J. H. J.; de Zeeuw, P. T. +1 more
We present radial velocities for 29 B- and A-type stars in the field of the nearby association Perseus OB2. The velocities are derived from spectra obtained with AURELIE, via cross correlation with radial velocity standards matched as closely as possible in spectral type. The resulting accuracy is ~ 2-3 km s-1. We use these measurements…
Chandra and XMM-Newton observations of Tololo 0109-383
Brandt, W. N.; Perola, G. C.; Bianchi, S. +4 more
We present and discuss Chandra and XMM-Newton observations of the Seyfert 2 galaxy and Compton-thick absorbed source, Tololo 0109-383. The hard X-ray emission (i.e. above ~ 2 keV), is dominated by a spatially unresolved reflection component, as already discovered by previous ASCA and BeppoSAX observations. The soft X-ray emission is partly ( ~ 15%…