Search Publications
Search for Radiative Decays of Cosmic Background Neutrino using Cosmic Infrared Background Energy Spectrum
Matsuura, Shuji; Kim, Shin-Hong; Takemasa, Ken-ichi +1 more
We propose to search for the neutrino radiative decay by fitting a photon energy spectrum of the cosmic infrared background to a sum of the photon energy spectrum from the neutrino radiative decay and a continuum. By comparing the present cosmic infrared background energy spectrum observed by AKARI and Spitzer to the photon energy spectrum expecte…
Solar Intranetwork Magnetic Elements: Bipolar Flux Appearance
Wang, Jingxiu; Li, Hui; Jin, Chunlan +1 more
This study aims to quantify characteristic features of the bipolar flux appearance of solar intranetwork (IN) magnetic elements. To attack this problem, we use the Narrowband Filter Imager (NFI) magnetograms from the Solar Optical Telescope (SOT) on board Hinode; these data are from quiet and enhanced network areas. Cluster emergence of mixed pola…
Thermospheric/mesospheric temperatures on Venus: Results from ground-based high-resolution spectroscopy of CO 2 in 1990/1991 and comparison to results from 2009 and between other techniques
Mahieux, Arnaud; Sonnabend, Guido; Sornig, Manuela +8 more
We report temperatures in Venus' upper mesosphere/lower thermosphere, deduced from reanalyzing very high resolution infrared spectroscopy of CO 2 emission lines acquired in 1990 and 1991. Kinetic temperatures at ∼110 km altitude (0.15 Pa) are derived from the Doppler width of fully-resolved single line profiles measured near 10.4 µ…
X-Ray Groups of Galaxies at 0.5 < z < 1 in zCOSMOS: Increased AGN Activities in High Redshift Groups
Koekemoer, Anton M.; Tresse, Laurence; Contini, Thierry +48 more
We present a photometric and spectroscopic study of galaxies at 0.5 < z < 1 as a function of the environment based on data from the zCOSMOS survey. There is a fair amount of evidence that galaxy properties depend on the mass of groups and clusters, in the sense that quiescent galaxies prefer more massive systems. We base our analysis on a ma…
Short Gas Dissipation Timescales: Diskless Stars in Taurus and Chamaeleon I
Briceño, Cesar; Calvet, Nuria; Herczeg, Gregory +1 more
We present an Advanced Camera for Surveys/Solar Blind Channel far-ultraviolet (FUV) study of H2 gas in 12 weak T Tauri stars in nearby star-forming regions. The sample consists of sources which have no evidence of inner disk dust. Our new FUV spectra show that in addition to the dust, the gas is depleted from the inner disk. This sample…
The three-micron spectral feature of the Saturnian haze: Implications for the haze composition and formation process
Moses, J. I.; Courtin, R.; Kim, S. J. +3 more
We retrieve a 3.4-µm spectral feature pertaining to the Saturnian haze from Cassini/VIMS Procyon occultation data obtained at 12 different altitudes from approximately 0.7 to 0.0018 mbar (Nicholson et al., 2006; Bellucci, 2008; Bellucci et al., 2009). The occultation occurred at 55°N latitude, at the edge of the “polar hood” region, where th…
Counterrotation in Magnetocentrifugally Driven Jets and Other Winds
Tsinganos, K.; Cayatte, V.; Lima, J. J. G. +2 more
Rotation measurement in jets from T Tauri stars is a rather difficult task. Some jets seem to be rotating in a direction opposite to that of the underlying disk, although it is not yet clear if this affects the totality or part of the outflows. On the other hand, Ulysses data also suggest that the solar wind may rotate in two opposite ways between…
A volcanotectonic survey of Ascraeus Mons, Mars
Byrne, Paul K.; Murray, John B.; van Wyk de Vries, Benjamin +1 more
Ascraeus Mons is one of the largest volcanoes on Mars. It is replete with well-preserved features that can be used to understand its volcanotectonic evolution. Previous studies of this volcano focused on specific features, and were limited by the quality and coverage of contemporary data. Our objective is to review and enhance the existing develop…
On the Distribution of Quiet-Sun Magnetic Fields at Different Heliocentric Angles
Katsukawa, Y.; Orozco Suárez, D.
This paper presents results from the analysis of high signal-to-noise ratio spectropolarimetric data taken at four heliocentric angles in quiet-Sun internetwork regions with the Hinode satellite. First, we find that the total circular and total linear polarization signals vary with heliocentric angle, at least for fields with large polarization si…
The role of the inner tail to midtail plasma sheet in channeling solar wind power to the ionosphere
Dandouras, I.; André, M.; Hamrin, M. +5 more
In this article we use Cluster power density (E · J) data from 2001, 2002, and 2004 to investigate energy conversion and transfer in the plasma sheet. We show that a southward IMF Bz is favorable for plasma sheet energy conversion, and that there is an increased particle and Poynting flux toward the Earth at times when Cluster observes …