Search Publications
Search for hydrogen peroxide in the Martian atmosphere by the Planetary Fourier Spectrometer onboard Mars Express
Aoki, Shohei; Kasaba, Yasumasa; Formisano, Vittorio +4 more
We searched for hydrogen peroxide (H2O2) in the Martian atmosphere using data measured by the Planetary Fourier Spectrometer (PFS) onboard Mars Express during five martian years (MY27-31). It is well known that H2O2 plays a key role in the oxidizing capacity of the Martian atmosphere. However, only a few…
Influence of local ionization on ionospheric densities in Titan's upper atmosphere
Galand, Marina; Coates, Andrew J.; Vigren, Erik +6 more
Titan has the most chemically complex ionosphere of the solar system. The main sources of ions on the dayside are ionization by EUV solar radiation and on the nightside include ionization by precipitated electrons from Saturn's magnetosphere and transport of ions from the dayside, but many questions remain open. How well do models predict local io…
A statistical analysis of current helicity and twist in solar active regions over the phases of the solar cycle using the spectro-polarimeter data of Hinode
Sakurai, Takashi; Otsuji, Kenichi; Kuzanyan, Kirill
Current helicity and twist of solar magnetic fields are important in characterizing the dynamo mechanism working in the convection zone of the Sun. We have carried out a statistical study on the current helicity of solar active regions observed with the spectro-polarimeter (SP) of the Hinode Solar Optical Telescope (SOT). We used SOT-SP data of 55…
A Search for Intergalactic Globular Clusters in the Local Group
di Tullio Zinn, Graziella; Zinn, Robert
The whole Sloan Digital Sky Survey (SDSS, 14,555 {{deg }2}) has been searched for intergalactic globular clusters (IGCs) in the Local Group (LG). Using optical, infrared, and ultraviolet photometric selection criteria and photometric redshifts, the 2.1× {{10}8} objects in the SDSS Galaxy Catalog were reduced to only 183,791 b…
Plasma Physical Parameters along CME-driven Shocks. II. Observation-Simulation Comparison
Bemporad, A.; Susino, R.; Lapenta, G. +1 more
In this work, we compare the spatial distribution of the plasma parameters along the 1999 June 11 coronal mass ejection (CME)-driven shock front with the results obtained from a CME-like event simulated with the FLIPMHD3D code, based on the FLIP-MHD particle-in-cell method. The observational data are retrieved from the combination of white-light c…
Herschel Dust Emission as a Probe of Starless Cores Mass: MCLD 123.5+24.9 of the Polaris Flare
Ferland, Gary J.; Abel, Nicholas P.; Wagle, Gururaj A. +1 more
We present newly processed archival Herschel images of molecular cloud MCLD 123.5+24.9 in the Polaris Flare. This cloud contains five starless cores. Using the spectral synthesis code Cloudy, we explore uncertainties in the derivation of column densities, and hence masses of molecular cores from Herschel data. We first consider several detailed gr…
The millimeter-wavelength sulfur dioxide absorption spectra measured under simulated Venus conditions
Bellotti, Amadeo; Steffes, Paul G.
Over 130 laboratory measurements of the 2-4 mm wavelength opacity of sulfur dioxide in a carbon dioxide atmosphere under simulated conditions for the upper Venus troposphere (temperatures between 308 and 343 K and pressures between 0.03 and 2 bar) have been made. These measurements along with the centimeter wavelength measurements by Steffes et al…
Witnessing a merging bullet being stripped in the galaxy cluster RXCJ2359.3-6042
Böhringer, Hans; Chon, Gayoung
We report the discovery of the merging cluster, RXCJ2359.3-6042, from the REFLEX II cluster survey and present our results from all three detectors combined in the imaging and spectral analysis of the XMM-Newton data. Also known as Abell 4067, this is a unique system, where a compact bullet penetrates an extended, low density cluster at redshift z…
Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper Belt analogue around HD 131511.
Kennedy, G. M.
A key discovery of the Kepler mission is of the circumbinary planets known as `Tatooines', which appear to be well aligned with their host stars' orbits. Whether this alignment is due to initially coplanar circumbinary planet-forming discs (i.e. nature), or subsequent alignment of initially misaligned discs by warping the inner disc or torquing th…
Herschel HIFI observations of the Sgr A +50 km s-1 Cloud. Deep searches for O2 in emission and foreground absorption
Liseau, R.; Roueff, E.; Pagani, L. +8 more
Context. The Herschel Oxygen Project (HOP) is an open time key program, awarded 140 h of observing time to search for molecular oxygen (O2) in a number of interstellar sources. To date O2 has definitely been detected in only two sources, namely ρ Oph A and Orion, reflecting the extremely low abundance of O2 in the …