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Constraining the primordial power spectrum from SNIa lensing dispersion
Ben-Dayan, Ido; Kalaydzhyan, Tigran
The (absence of detecting) lensing dispersion of supernovae type Ia (SNIa) can be used as a novel and extremely efficient probe of cosmology. In this preliminary example we analyze its consequences for the primordial power spectrum. The main setback is the knowledge of the power spectrum in the nonlinear regime, 1 Mpc-1≲k≲102…
AMUSE-Field. II. Nucleation of Early-type Galaxies in the Field versus Cluster Environment
Treu, Tommaso; Baldassare, Vivienne F.; Plotkin, Richard M. +4 more
The optical light profiles of nearby early-type galaxies are known to exhibit a smooth transition from nuclear light deficits to nuclear light excesses with decreasing galaxy mass, with as much as 80% of the galaxies with stellar masses below 1010 M ⊙ hosting a massive nuclear star cluster (NSC). At the same time, while all m…
Variation of the X-ray non-thermal emission in the Arches cloud.
Ponti, G.; Decourchelle, A.; Terrier, R. +5 more
The origin of the iron fluorescent line at 6.4 keV from an extended region surrounding the Arches cluster is debated and the non-variability of this emission up to 2009 has favoured the low-energy cosmic ray origin over a possible irradiation by hard X-rays. By probing the variability of the Arches cloud non-thermal emission in the most recent yea…
Evidence for the braking of flow bursts as they propagate toward the Earth
Dandouras, I.; Nilsson, H.; André, M. +9 more
In this article we use energy conversion arguments to investigate the possible braking of flow bursts as they propagate toward the Earth. By using E·J data (E and J are the electric field and the current density) observed by Cluster in the magnetotail plasma sheet, we find indications of a plasma deceleration in the region -20 RE < X…
The Dynamical Masses, Densities, and Star Formation Scaling Relations of Lyα Galaxies
Finkelstein, Steven L.; Fynbo, Johan P. U.; Malhotra, Sangeeta +4 more
We present the first dynamical mass measurements for Lyα galaxies at high redshift, based on velocity dispersion measurements from rest-frame optical emission lines and size measurements from Hubble Space Telescope imaging, for nine galaxies drawn from four surveys. We use these measurements to study Lyα galaxies in the context of galaxy scaling r…
The Water Abundance behind Interstellar Shocks: Results from Herschel/PACS and Spitzer/IRS Observations of H2O, CO, and H2
Nisini, Brunella; van Dishoeck, Ewine F.; Güsten, Rolf +7 more
We have investigated the water abundance in shock-heated molecular gas, making use of Herschel measurements of far-infrared (IR) CO and H2O line emissions in combination with Spitzer measurements of mid-IR H2 rotational emissions. We present far-IR line spectra obtained with Herschel's Photodetector Array Camera and Spectrome…
Wind circulation regimes at Venus' cloud tops: Ground-based Doppler velocimetry using CFHT/ESPaDOnS and comparison with simultaneous cloud tracking measurements using VEx/VIRTIS in February 2011
Widemann, Thomas; Machado, Pedro; Luz, David +1 more
We present new results based on ground-based Doppler spectroscopic measurements, obtained with the ESPaDOnS spectrograph at Canada-France-Hawaii telescope (CFHT) and simultaneous observations of velocity fields, obtained from space by the VIRTIS-M instrument on board the Venus Express spacecraft. These measurements are based on high-resolution spe…
Impact of particles on the Planck HFI detectors: Ground-based measurements and physical interpretation
Bock, J. J.; Catalano, A.; Coulais, A. +31 more
The Planck High Frequency Instrument (HFI) surveyed the sky continuously from August 2009 to January 2012. Its noise and sensitivity performance were excellent (from 11 to 40 aW Hz-1), but the rate of cosmic-ray impacts on the HFI detectors was unexpectedly higher than in other instruments. Furthermore, collisions of cosmic rays with th…
Backscattered energetic neutral atoms from the Moon in the Earth's plasma sheet observed by Chandarayaan-1/Sub-keV Atom Reflecting Analyzer instrument
Barabash, Stas; Futaana, Yoshifumi; Wieser, Martin +8 more
We present the observations of energetic neutral atoms (ENAs) produced at the lunar surface in the Earth's magnetotail. When the Moon was located in the terrestrial plasma sheet, Chandrayaan-1 Energetic Neutrals Analyzer (CENA) detected hydrogen ENAs from the Moon. Analysis of the data from CENA together with the Solar Wind Monitor (SWIM) onboard …
Measuring the Stellar Masses of z ~ 7 Galaxies with the Spitzer UltRaFaint SUrvey Program (SURFS UP)
Schrabback, T.; Bradač, M.; Huang, K. -H. +15 more
We present Spitzer/IRAC observations of nine z'-band dropouts highly magnified (2 <~ µ <~ 12) by the Bullet Cluster. We combine archival imaging with our Exploratory program (SURFS UP), which results in a total integration time of ~30 hr per Infrared Array Camera (IRAC) band. We detect (gsim 3σ) in both IRAC bands the brightest of thes…