Search Publications
Ultraviolet radiation constraints around the circumstellar habitable zones
Buccino, Andrea P.; Lemarchand, Guillermo A.; Mauas, Pablo J. D.
Ultraviolet radiation is known to inhibit photosynthesis, induce DNA destruction and cause damage to a wide variety of proteins and lipids. In particular, UV radiation between 200 and 300 nm becomes energetically very damaging to most of the terrestrial biological systems. On the other hand, UV radiation is usually considered one of the most impor…
Comparing Dynamical and Photometric Mass Estimates of Low- and High-Redshift Galaxies: Random and Systematic Uncertainties
Wuyts, S.; Rix, H. -W.; van der Wel, A. +4 more
We determine the importance of redshift-dependent systematic effects in the determination of stellar masses from broadband spectral energy distributions (SEDs), using high-quality kinematic and photometric data of early-type galaxies at z~1 and z~0. We find that photometric masses of z~1 galaxies can be systematically different, by up to a factor …
Faint Infrared Extragalactic Survey: Data and Source Catalog of the MS 1054-03 Field
Förster Schreiber, N. M.; Rix, H. -W.; van der Werf, P. +8 more
We present deep near-infrared Js-, H-, and Ks-band imaging of a field around MS 1054-03, a massive cluster at z=0.83. The observations were carried out with the ISAAC instrument at the ESO Very Large Telescope (VLT) as part of the Faint Infrared Extragalactic Survey (FIRES). The total integration time amounts to 25.9 hr in J<…
Non-thermal cosmic backgrounds from blazars: the contribution to the CMB, X-ray and γ-ray backgrounds
Cavazzuti, E.; Colafrancesco, S.; Giommi, P. +2 more
We present a new assessment of the contribution of the blazar population to the extragalactic background radiation across the electromagnetic spectrum. Our calculations rely on deep blazar radio counts that we have derived by combining several radio and multi-frequency surveys. We show that blazar emission integrated over cosmic time gives rise to…
Bimodal spectral variability of Cygnus X-1 in an intermediate state
Belloni, T.; Chaty, S.; Rodriguez, J. +11 more
We report the results of an observation of
Cassini observations of flow-like features in western Tui Regio, Titan
Sotin, Christophe; Barnes, Jason W.; Rodriguez, Sebastien +9 more
A large (>3 × 104 km2), lobate, 5-µm-bright region seen by Cassini on Titan's leading equatorial region is best explained as a flow field. We discuss observations from the Visual and Infrared Mapping Spectrometer and Imaging Science Subsystem of the feature and present a map of the field. We establish relative ages o…
A Sample of Low-Redshift BL Lacertae Objects. II. EVN and MERLIN Data and Multiwavelength Analysis
Falomo, R.; Giroletti, M.; Giovannini, G. +1 more
We present new radio observations of 9 members of a sample of 29 nearby (z<0.2) BL Lac objects. The new data have been obtained with the European VLBI Network and/or MERLIN at 1.6 and 5 GHz and complement previous observations. For one object, the TeV source Mrk 421, we also present deep multiepoch VLBA and global VLBI data, which reveal a reso…
The Faint Afterglow and Host Galaxy of the Short-Hard GRB 060121
Bremer, M.; Fruchter, A. S.; Rol, E. +14 more
We present optical and X-ray observations of the afterglow and host galaxy of the short-hard GRB 060121. The faint R-band afterglow is seen to decline as t-0.66+/-0.09 while the X-ray falls as t-1.18+/-0.04, indicating the presence of the cooling break between the two frequencies. However, the R-band afterglow is very faint c…
Solar coronal-hole plasma densities and temperatures
Wilhelm, K.
Polar plumes extending from the Sun into the solar corona have long been seen during eclipses, and can now be studied without this restriction with telescopes and spectrometers on board of spacecraft. Despite the large amount of observational data available on this prominent phenomenon, it is not clear whether plumes contribute substantially to th…
Mapping potential-vorticity dynamics on Jupiter. I: Zonal-mean circulation from Cassini and Voyager 1 data
Fouchet, Thierry; Read, Peter L.; Conrath, Barney J. +3 more
Maps of Ertel potential vorticity on isentropic surfaces (IPV) and/or quasi-geostrophic potential vorticity (QGPV) are well established in dynamical meteorology as powerful sources of insight into dynamical processes involving 'balanced' flow. In the present study, we derive maps of zonal-mean IPV and QGPV in Jupiter's upper troposphere and lower …