Search Publications
A deep XMM-Newton serendipitous survey of a middle-latitude area
Caraveo, P. A.; Bignami, G. F.; de Luca, A. +4 more
The radio-quiet neutron star 1E1207.4-5209 was the target of a 260 ks XMM-Newton observation, that yielded, as a by product, a harvest of about 200 serendipitous X-ray sources above a limiting flux of 2 × 10-15 erg cm-2 s-1 in the 0.3-8 keV energy range. In view of the intermediate latitude of our field (b≃ 10°), i…
Swift, RXTE, and INTEGRAL observation of Swift J1922.7-1716
Campana, S.; Belloni, T.; Falanga, M.
We report the results of analyzing Swift, RossiXTE, and INTEGRAL data of Swift J1922.7-1716, a likely transient X-ray source discovered by Swift/BAT. Both the fast variability measured by the RXTE/PCA and the combined Swift/XRT, RXTE/PCA, and INTEGRAL/ISGRI (0.5-100 keV) energy spectrum suggest that the system is a neutron-star low-mass X-ray bina…
On measuring the Tully-Fisher relation at z > 1. A case study using strong Hα emitting galaxies at z > 1.5
Yan, L.; van der Werf, P. P.; Moorwood, A. F. M. +1 more
The evolution of the line width - luminosity relation for spiral galaxies, the Tully-Fisher relation, strongly constrains galaxy formation and evolution models. At this moment, the kinematics of z>1 spiral galaxies can only be measured using rest frame optical emission lines associated with star formation, such as Hα and [O III]5007/4959 and [O…
Calibration of TRACE Lyman-α images using SOHO/SUMER observations
Kim, Sungsoo S.; Roh, Hee-Seon; Cho, Kyung-Seok +1 more
1216 Å channel images from the Transition Region and Coronal Explorer (TRACE) contain not only the desired HI Lyman-α (Lα) line emission from the Sun, but also some UV continuum around 1600 Å. By comparing TRACE data with Lα images from the Very High Angular Resolution Ultraviolet Telescope, Handy et al. proposed a simple procedure to remove the c…
High resolution spectroscopy of giant HII regions around young massive clusters
Maiolino, R.; Vanzi, L.; Scatarzi, A. +1 more
We present new high-resolution optical spectroscopy of giant HII regions around three young
massive clusters located in the blue dwarf galaxies NGC 5253 and He 2-10. We used the observations to derive the mass of the clusters under the hypothesis of virialization. The virial masses exceed the optical ones. In one case, however, the viria…Calibration of the PRONAOS/SPM submillimeter photometer
Bernard, J. -P.; Dupac, X.; Giard, M. +12 more
Context: .
Aims: .PRONAOS is a stratospheric balloon-borne project dedicated to submillimeter astronomy. Sensitive to low emission gradients, PRONAOS allowed pointed observations in four photometric bands between 200 µm and 1.2 mm with an angular resolution of 2' to 3.5'. We present here the PRONAOS calibration strategy and the accuracy …
Multi-aperture photometry of extended IR sources with ISOPHOT. I. The nature of extended IR emission of planetary Nebulae
Walker, H. J.; Richards, P. J.; Müller, T. G. +2 more
Context: .ISOPHOT multi-aperture photometry is an efficient method to resolve compact sources or to detect extended emission down to relatively faint levels with single detectors in the wavelength range 3 to 100 µm.
Aims: .Using ISOPHOT multi-aperture photometry and complementary ISO spectra and IR spectral energy distributions we discus…
Multifractality in a ring of star formation: the case of Arp 220
de La Fuente Marcos, R.; de La Fuente Marcos, C.
Context: .Formation of super star-clusters can be triggered during the final stages of galaxy mergers or galactic interactions, when significant numbers of massive stars are formed out of large gas-cloud systems. Giant cloud complexes show a fractal structure due to turbulence and/or self-gravitation; therefore, super clusters formed out of these …
Arp 116: interacting system or chance alignment?
de Grijs, R.; Robertson, A. R. I.
Using high spatial resolution Hubble Space Telescope/Advanced Camera for Surveys archival imaging observations of
Multi-wavelength study of a high velocity event near a sunspot
Doyle, J. G.; Banerjee, D.; O'Shea, E. +1 more
Context: .Jets with velocities higher than 200 km s-1 are often observed in the X-ray spectral range in the solar atmosphere, however, very few such objects are observed in the EUV range.
Aims: .We report on an eruptive event observed in the south-west side of a sunspot, within active region, AR0554, in a range of spectral lines for…