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Changes of Dust Opacity with Density in the Orion A Molecular Cloud
Arzoumanian, Doris; Di Francesco, James; André, Philippe +12 more
We have studied the opacity of dust grains at submillimeter wavelengths by estimating the optical depth from imaging at 160, 250, 350, and 500 µm from the Herschel Gould Belt Survey and comparing this to a column density obtained from the Two Micron All Sky Survey derived color excess E(J - K s). Our main goal was to investigate t…
The role of transient ion foreshock phenomena in driving Pc5 ULF wave activity
Plaschke, F.; Angelopoulos, V.; Turner, D. L. +2 more
The ion foreshock is a source of energy for magnetospheric ULF waves, but it is usually only considered effective at driving ULF waves with frequencies above the Pc5 (2-7 mHz) range. We present observations for an 8 h high speed solar wind interval on 14 July 2008 during which three distinct types of transient ion foreshock phenomena (TIFP) were o…
A New Population of High-z, Dusty Lyα Emitters and Blobs Discovered by WISE: Feedback Caught in the Act?
Tsai, Chao-Wei; Griffith, Roger L.; Wright, Edward L. +12 more
By combining data from the NASA Wide-field Infrared Survey Explorer (WISE) mission with optical spectroscopy from the W. M. Keck telescope, we discover a mid-IR color criterion that yields a 78% success rate in identifying rare, typically radio-quiet, 1.6 <~ z <~ 4.6 dusty Lyα emitters (LAEs). Of these, at least 37% have emission extended on…
Three-dimensional Features of the Outer Heliosphere due to Coupling between the Interstellar and Interplanetary Magnetic Fields. IV. Solar Cycle Model Based on Ulysses Observations
McComas, D. J.; Pogorelov, N. V.; Zank, G. P. +3 more
The solar cycle has a profound influence on the solar wind (SW) interaction with the local interstellar medium (LISM) on more than one timescales. Also, there are substantial differences in individual solar cycle lengths and SW behavior within them. The presence of a slow SW belt, with a variable latitudinal extent changing within each solar cycle…
A survey of young, nearby, and dusty stars conducted to understand the formation of wide-orbit giant planets. VLT/NaCo adaptive optics thermal and angular differential imaging
Lagrange, A. -M.; Desidera, S.; Bonnefoy, M. +7 more
Context. Over the past decade, direct imaging has confirmed the existence of substellar companions on wide orbits from their parent stars. To understand the formation and evolution mechanisms of these companions, their individual as well as the full population properties must be characterized.
Aims: We aim at detecting giant planet and/or bro…
The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z = 1
Demarco, R.; Lidman, C.; Meyers, J. +22 more
Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) have increased their stellar mass by a factor of almost 2 between z ∼ 0.9 and z ∼ 0.2. The numerical simulations further suggest that more than half this mass is accreted through major mergers. Using a sample of 18 distant galax…
Particle-physics constraints from the globular cluster M5: neutrino dipole moments
Weiss, A.; Stetson, P. B.; Catelan, M. +4 more
Stellar evolution is modified if energy is lost in a "dark channel" similar to neutrino emission. Comparing modified stellar evolution sequences with observations provides some of the most restrictive limits on axions and other hypothetical low-mass particles and on non-standard neutrino properties. In particular, a putative neutrino magnetic dipo…
Annual survey of water vapor vertical distribution and water-aerosol coupling in the martian atmosphere observed by SPICAM/MEx solar occultations
Forget, F.; Maltagliati, L.; Montmessin, F. +5 more
The vertical distribution of water vapor is a very important diagnostic to determine the physical and chemical processes that drive the martian water cycle. Yet, very few direct measurements have been performed so far, and our knowledge of the H2O vertical distribution on Mars relies on General Circulation Models (GCMs). The study prese…
Sterile neutrinos: Cosmology versus short-baseline experiments
Melchiorri, Alessandro; Archidiacono, Maria; Fornengo, Nicolao +2 more
Cosmology and short-baseline (SBL) neutrino oscillation data both hint at the existence of light sterile neutrinos with masses in the 1 eV range. Here we perform a detailed analysis of the sterile neutrino scenario using both cosmological and SBL data. We have additionally considered the possibility that the extra neutrino degrees of freedom are n…
Herschel/PACS Spectroscopic Survey of Protostars in Orion: The Origin of Far-infrared CO Emission
Maret, S.; Manoj, P.; Di Francesco, J. +14 more
We present far-infrared (57-196 µm) spectra of 21 protostars in the Orion molecular clouds. These were obtained with the Photodetector Array Camera and Spectrometer (PACS) on board the Herschel Space observatory as part of the Herschel Orion Protostar Survey program. We analyzed the emission lines from rotational transitions of CO, involving…