Search Publications
Self-consistent modeling of induced magnetic field in Titan's atmosphere accounting for the generation of Schumann resonance
Béghin, Christian
This model is worked out in the frame of physical mechanisms proposed in previous studies accounting for the generation and the observation of an atypical Schumann Resonance (SR) during the descent of the Huygens Probe in the Titan's atmosphere on 14 January 2005. While Titan is staying inside the subsonic co-rotating magnetosphere of Saturn, a se…
Fine magnetic characteristics of a light bridge observed by Hinode
Liu, D.; Liu, S.
Light bridge (LB) is bright structure crossing the umbra of sunspots and associated to the breakup or assembly of sunspots. In this paper, a LB is presented and studied using the observatory data obtained by Hinode satellites. Force-free factor (α) and the z-component of current (Jz) and tension force (Tz) are calculated basi…
Wide-banded NTC radiation: local to remote observations by the four Cluster satellites
Rauch, J. -L.; Décréau, P. M. E.; Canu, P. +7 more
The Cluster multi-point mission offers a unique collection of non-thermal continuum (NTC) radio waves observed in the 2-80 kHz frequency range over almost 15 years, from various view points over the radiating plasmasphere. Here we present rather infrequent case events, such as when primary electrostatic sources of such waves are embedded within th…
Morphological Classification of High-redshift Massive Galaxies in the COSMOS/UltraVISTA Field
Kong, X.; Fang, G. W.; Ma, Z. Y.
Utilizing the multi-band photometry catalog of the COSMOS (Cosmic Evolution Survey)/UltraVISTA (Ultra-deep Visible and Infrared Survey Telescope for Astronomy) field and the high-resolution HST WFC3 (Hubble Space Telescope Wide Field Camera 3) near-infrared imaging from the CANDELS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey) f…
Near-Infrared Spectra of High-Albedo Outer Main-Belt Asteroids
Shirahata, Mai; Hasegawa, Sunao; Usui, Fumihiko +4 more
Most outer main-belt asteroids have low albedos because of their carbonaceouslike bodies. However, infrared satellite surveys have revealed that some asteroids have high albedos, which may suggest the presence of unusual surface minerals for those primitive objects. We present new near-infrared (1.1-2.5 µm) spectra of four outer main-belt as…
Mapping the Surface of the Magnetar 1E 1048.1-5937 in Outburst and Quiescence through Phase-resolved X-Ray Spectroscopy
Göğüş, Ersin; Güver, Tolga; Özel, Feryal
We model the pulse profiles and the phase-resolved spectra of the anomalous X-ray pulsar 1E 1048.1-5937 obtained with XMM-Newton to map its surface temperature distribution during an active and a quiescent epoch. We develop and apply a model that takes into account the relevant physical and geometrical effects on the neutron star surface, magnetos…
Internal Proper Motions in the Eskimo Nebula
López, J. A.; Steffen, W.; García-Díaz, Ma. T. +2 more
We present measurements of internal proper motions at more than 500 positions of NGC 2392, the Eskimo Nebula, based on images acquired with WFPC2 on board the Hubble Space Telescope at two epochs separated by 7.695 yr. Comparisons of the two observations clearly show the expansion of the nebula. We measured the amplitude and direction of the motio…
3XMM J185246.6+003317 as transient neutron star
Neuhäuser, R.; Hohle, M. M.; Hambaryan, V. +2 more
We performed an X-ray timing and spectral analysis of the variable source 3XMM J185246.6+003317 to investigate its physical nature. The data from all observations of 3XMM J185246.6+003317 conducted by XMM-Newton EPIC MOS1 and MOS2 with the same instrumental setup in 2004-2009 were reprocessed to form a homogenous data set of solar barycenter corre…
Focal lengths of Venus Monitoring Camera from limb locations
Limaye, Sanjay S.; Roatsch, T.; Markiewicz, W. J. +3 more
The Venus Monitoring Camera (VMC) carried by European Space Agency's Venus Express orbiter (Svedhem et al., 2007) consists of four optical units, each with a separate filter casting an image on a single CCD (Markiewicz et al., 2007a, 2007b). The desire to capture as much of the planet in a single frame during the spacecraft's 24 h, 0.84 eccentrici…
Revisiting the cosmological bias due to local gravitational redshifts
Huang, Zhiqi
A recent article by Wojtak et al. pointed out that the local gravitational redshift, despite its smallness (∼10-5 ), can have a noticeable (∼1 %) systematic effect on our cosmological parameter measurements. The authors studied a few extended cosmological models (nonflat Λ CDM , w CDM , and w0-waCDM ) with a mock s…