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Evidence of electrical activity on Titan drawn from the Schumann resonances sent by Huygens probe
Morente, Juan A.; Portí, Jorge A.; Navarro, Enrique A. +1 more
A procedure is shown for extracting weak resonances from the responses of electromagnetic systems excited by electric discharges. The procedure, based on analysis of the late-time system response, is first checked using an analytical function and later with the data for the electric field generated by the computational simulation of Titan's atmosp…
Bulges of disk galaxies at intermediate redshifts. II. Nuclear, disk, and global colors in the Groth Strip
Balcells, Marc; Domínguez-Palmero, Lilian
Context: The chronology of bulge and disk formation is a major unsolved issue in galaxy formation, which impacts on our global understanding of the Hubble sequence.
Aims: We analyse colours of the nuclear regions of intermediate redshift disk galaxies, with the aim of obtaining empirical information of relative ages of bulges and disks at 0.1 …
The Spatial Orientation of Planetary Nebulae within the Milky Way
Weidmann, Walter A.; Díaz, Rubén J.
We analyze the spatial orientation of a homogenous sample of 440 elongated Planetary Nebulae (PNe) in order to determine the orientation of their apparent major axis with respect to the Milky Way plane. We present some important geometrical and statistical considerations that have been overlooked by previous works on the subject. The global distri…
On the Stellar Populations in Faint Red Galaxies in the Hubble Ultra Deep Field
Papovich, Casey; Eisenstein, Daniel J.; Stutz, Amelia M.
We study the nature of faint red-selected galaxies at z ~ 2-3 using the Hubble Ultra Deep Field (HUDF) and Spitzer Infrared Array Camera (IRAC) photometry. Given the magnitude limit of the HST data, we detect candidate galaxies to HAB < 26 mag, probing lower luminosity (lower mass) galaxies at these redshifts. We identify 32 galaxies…
Structures in surface-brightness profiles of LMC and SMC star clusters: evidence of mergers?
Bonatto, C.; Bica, E.; Carvalho, L. +2 more
Context: The LMC and SMC are rich in binary star clusters, and some mergers are expected. It is thus important to characterise single clusters, binary clusters and candidates for mergers.
Aims: We selected a sample of star clusters in each Cloud with this aim. Surface photometry of 25 SMC and 22 LMC star clusters was carried with the ESO Danis…
Magnetotail dipolarization and associated current systems observed by Cluster and Double Star
Zhang, T. L.; RèMe, H.; Fazakerley, A. N. +22 more
A dipolarization and its associated current systems are studied using Cluster, Double Star TC1, and ground-based observations. The Cluster spacecraft are located approximately 16 RE downtail near 0030 LT. The Double Star TC1 spacecraft is located more earthward at approximately 7 RE just before local midnight. Auroral observa…
Energetic Neutral Atoms from the Heliosheath
Barabash, S.; Grigoriev, A.; Wurz, P. +1 more
We present the measurement and analysis of hydrogen energetic neutral atoms (ENAs) recorded with the NPD sensor of the ASPERA-3 instrument on board Mars Express during the cruise phase and the Mars orbit phase. We conclude that the origin of these ENAs is the inner heliosheath. The ENA energy spectra are all very similar and can be fitted well by …
XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft X-ray excess problem
Bianchi, S.; Jiménez-Bailón, E.; Matt, G. +1 more
Context: The nature and origin of the soft X-ray excess in radio-quiet AGN is still an open issue. The interpretation in terms of thermal disc emission has been challanged by the discovery of the constancy of the effective temperature despite the wide range of Black Hole masses of the observed sources. Alternative models are reflection from ionize…
Diameter and photospheric structures of Canopus from ;AMBER/VLTI interferometry
Millour, F.; Domiciano de Souza, A.; Bendjoya, P. +2 more
Context: Direct measurements of fundamental parameters and photospheric structures of post-main-sequence intermediate-mass stars are required for a deeper understanding of their evolution.
Aims: Based on near-IR long-baseline interferometry we aim to resolve the stellar surface of the F0 supergiant star Canopus, and to precisely measure its an…
Titan's rotational state. The effects of a forced ``free'' resonant wobble
Noyelles, Benoît
In Noyelles et al. (Astron. Astrophys. 478, 959–970 (2008)), a resonance involving the wobble of Titan is hinted at. This paper studies this scenario and its consequences. The first step is to build an accurate analytical model that would help to find the likely resonances in the rotation of every synchronous body. In this model, I take the orbita…