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Post-Planck dark energy constraints
Hazra, Dhiraj Kumar; Pal, Supratik; Sen, Anjan A. +2 more
We constrain plausible dark energy models using the recently published cosmic microwave background (CMB) temperature anisotropy data from Planck together with WMAP9 low-ℓ polarization data and the data from low redshift surveys. To circumvent the limitations of any particular equation of state toward describing all existing dark energy models, we …
Total electron content in the Martian atmosphere: A critical assessment of the Mars Express MARSIS data sets
Gurnett, D. A.; Lester, M.; Morgan, D. D. +14 more
The total electron content (TEC) is one of the most useful parameters to evaluate the behavior of the Martian ionosphere because it contains information on the total amount of free electrons, the main component of the Martian ionospheric plasma. The Mars Express Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) radar is able to d…
Charge exchange in cometary coma: Discovery of H- ions in the solar wind close to comet 67P/Churyumov-Gerasimenko
Goldstein, R.; Mokashi, P.; Tzou, C. -Y. +4 more
As Rosetta was orbiting comet 67P/Churyumov-Gerasimenko, the Ion and Electron Sensor detected negative particles with angular distributions like those of the concurrently measured solar wind protons but with fluxes of only about 10% of the proton fluxes and energies of about 90% of the proton energies. Using well-known cross sections and energy-lo…
Multi-spacecraft Measurement of Turbulence within a Magnetic Reconnection Jet
Khotyaintsev, Yu. V.; Matthaeus, W. H.; Chapman, S. C. +3 more
The relationship between magnetic reconnection and plasma turbulence is investigated using multipoint in situ measurements from the Cluster spacecraft within a high-speed reconnection jet in the terrestrial magnetotail. We show explicitly that work done by electromagnetic fields on the particles, {\boldsymbol{J}}\cdot {\boldsymbol{E}}, has a non-G…
Star-formation histories of local luminous infrared galaxies
Pérez-González, Pablo G.; Arribas, Santiago; Colina, Luis +7 more
We present analysis of the integrated spectral energy distribution (SED) from the ultraviolet (UV) to the far-infrared and Hα of a sample of 29 local systems and individual galaxies with infrared (IR) luminosities between 1011L⊙ and 1011.8L⊙. We combined new narrow-band Hα + [N ii] and broad-band g, r op…
Hydrogen Ly-α and Ly-β full Sun line profiles observed with SUMER/SOHO (1996-2009)
Vial, J. -C.; Wilhelm, K.; Curdt, W. +2 more
Context. Accurate hydrogen spectra emitted by the entire solar disc in the Ly-α and Ly-βlines are valuable for deriving the distribution and the behaviour of atomic hydrogen in the heliosphere, for understanding the UV emissions of solar type stars better, and finally for estimating the solar energy input that mainly initiates the chemical process…
Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
Bianchi, Stefano; Janiuk, Agnieszka; Capitanio, Fiamma +1 more
Aims: During the bright outburst in 2011, the black hole candidate IGR J17091-3624 exhibited strong quasi-periodic flare-like events (on timescales of tens of seconds) in some characteristic states, the so-called heartbeat state. From the theoretical point of view, these oscillations may be modeled by the process of accretion disk instability…
Infrared emission of young HII regions: a Herschel/Hi-GAL study
Smith, M. D.; Testi, L.; Molinari, S. +7 more
Context. Investigating the relationship between radio and infrared emission of Hii regions may help shed light on the nature of the ionizing stars and the formation mechanism of early-type stars in general.
Aims: We have taken advantage of recent unbiased surveys of the Galactic plane such as Herschel/Hi-GAL and VLA/CORNISH to study a bona fi…
Evidence for High-frequency QPOs with a 3:2 Frequency Ratio from a 5000 Solar Mass Black Hole
Cenko, S. Bradley; Zoghbi, Abderahmen; Tombesi, Francesco +3 more
Following the discovery of 3:2 resonance quasi-periodic oscillations (QPOs) in M82X-1, we have constructed power density spectra (PDS) of all 15 (sufficiently long) XMM-Newton observations of the ultraluminous X-ray source NGC 1313 X-1 (LX ≈ 2 × 1040 erg s-1). We detect a strong QPO at a frequency of 0.29 ± 0.01 Hz…
Gale crater and impact processes - Curiosity's first 364 Sols on Mars
Bridges, Nathan T.; Mangold, Nicolas; Wiens, Roger C. +18 more
Impact processes at all scales have been involved in the formation and subsequent evolution of Gale crater. Small impact craters in the vicinity of the Curiosity MSL landing site and rover traverse during the 364 Sols after landing have been studied both from orbit and the surface. Evidence for the effect of impacts on basement outcrops may includ…