Search Publications
New results on planetary lightning
Yair, Yoav
We present the latest observations from spacecraft and ground-based instruments in search for lightning activity in the atmospheres of planets in the solar system, and put them in context of previous research. Since the comprehensive book on planetary atmospheric electricity compiled by Leblanc et al. (2008), advances in remote sensing technology …
The ACS LCID Project. VII. The Blue Stragglers Population in the Isolated dSph Galaxies Cetus and Tucana
Hidalgo, S. L.; Mayer, L.; Stetson, P. B. +8 more
We present the first investigation of the Blue Straggler star (BSS) population in two isolated dwarf spheroidal galaxies of the Local Group, Cetus and Tucana. Deep Hubble Space Telescope/Advanced Camera for Surveys photometry allowed us to identify samples of 940 and 1214 candidates, respectively. The analysis of the star formation histories of th…
Discovery of Two Supernovae in the Nuclear Regions of the Luminous Infrared Galaxy IC 883
Colina, L.; Kankare, E.; Efstathiou, A. +10 more
We report the discovery of two consecutive supernovae (SNe), 2010cu and 2011hi, located at 0farcs37 (180 pc) and 0farcs79 (380 pc) projected distance, respectively, from the center of the K-band nucleus of the luminous infrared galaxy (LIRG) IC 883. The SNe were discovered in an ongoing near-infrared K-band search for core-collapse SNe in such gal…
The Optical and Ultraviolet Emission-line Properties of Bright Quasars with Detailed Spectral Energy Distributions
Gu, Qiusheng; Shang, Zhaohui; Brotherton, Michael S. +2 more
We present measurements and statistical properties of the optical and ultraviolet emission lines present in the spectra of 85 bright quasars which have detailed spectral energy distributions. This heterogeneous sample has redshifts up to z = 1.5 and is comprised of three subsamples that may be of particular utility: ultraviolet excess Palomar-Gree…
The Unimodal Distribution of Blue Straggler Stars in M75 (NGC 6864)
Dalessandro, E.; Contreras Ramos, R.; Ferraro, F. R. +2 more
We have used a combination of multiband high-resolution and wide-field ground-based observations to image the Galactic globular cluster M75 (NGC 6864). The extensive photometric sample covers the entire cluster extension, from the very central regions out to the tidal radius, allowing us to determine the center of gravity and to construct the most…
Explosive Events: Swirling Transition Region Jets
Curdt, W.; Tian, H.; Kamio, S.
In this paper, we extend our earlier work to provide additional evidence for an alternative scenario to explain the nature of events called `explosive events'. The bidirected, fast Doppler motion of explosive events observed spectroscopically in the transition region emission is classically interpreted as a pair of bidirectional jets moving upward…
Correction to “A statistical study of the propagation characteristics of whistler waves observed by Cluster”
Khotyaintsev, Yuri V.; Agapitov, Oleksiy; Krasnoselskikh, Vladimir +1 more
Abstract Available from http://www.agu.org
Accretion Geometry of the Low-Mass X-Ray Binary Aquila X-1 in the Soft and Hard States
Makishima, Kazuo; Nakazawa, Kazuhiro; Takahashi, Hiromitsu +4 more
The neutron-star Low-Mass X-ray Binary Aquila X-1 was observed seven times in total with the Suzaku X-ray observatory from September 28 to October 30 in 2007, in the decaying phase of an outburst. In order to constrain the flux-dependent accretion geometry of this source over wider energy bands than employed in most previous studies, the present s…
The ultracool dwarf DENIS-P J104814.7-395606. Chromospheres and coronae at the low-mass end of the main-sequence
Schmitt, J. H. M. M.; Leone, F.; Cupani, G. +8 more
Context. Several diagnostics ranging from the radio to the X-ray band are suitable for investigating the magnetic activity of late-type stars. Empirical connections between the emission at different wavelengths place constraints on the nature and efficiency of the emission mechanism and the physical conditions in different atmospheric layers. The …
Acceleration of radiation belts electrons by oblique chorus waves
Krasnoselskikh, V.; Agapitov, O.; Artemyev, A. +1 more
The redistribution of energy during the recovery phase of geomagnetic storms related to the acceleration of electrons in the Earth's outer radiation belt by cyclotron-resonant chorus waves is an important and challenging topic of magnetospheric plasma physics. An approximate analytical formulation of energy diffusion coefficients is derived in thi…