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Search for Gamma-Ray Emission from AE Aquarii with Seven Years of Fermi-LAT Observations
Rea, Nanda; Torres, Diego F.; Li, Jian +4 more
AE Aquarii (AE Aqr) is a cataclysmic binary hosting one of the fastest rotating ({P}{spin} = 33.08 s) white dwarfs (WDs) known. Based on seven years of Fermi Large Area Telescope (LAT) Pass 8 data, we report on a deep search for gamma-ray emission from AE Aqr. Using X-ray observations from ASCA, XMM-Newton, Chandra, Swift, Suzaku, and N…
The ACS LCID Project. XI. On the Early Time Resolution of SFHs of Local Group Dwarf Galaxies: Comparing the Effects of Reionization in Models with Observations
Dolphin, Andrew; Skillman, Evan; Monelli, Matteo +10 more
The analysis of the early star formation history (SFH) of nearby galaxies, obtained from their resolved stellar populations, is relevant as a test for cosmological models. However, the early time resolution of observationally derived SFHs is limited by several factors. Thus, direct comparison of observationally derived SFHs with those derived from…
Stratigraphy and formation of clays, sulfates, and hydrated silica within a depression in Coprates Catena, Mars
Weitz, Catherine M.; Bishop, Janice L.
We investigate the morphology, mineralogy, and stratigraphy of light-toned layered deposits within a trough of Coprates Catena, centered at -15°N, 300°E. One of the deposits in the eastern portion of the trough contains numerous hydrated minerals, including Al-phyllosilicates, Fe/Mg-phyllosilicates, hydrated silica, hydrated sulfates, jarosite and…
Cosmological Parameters from CMB Maps without Likelihood Approximation
Eriksen, H. K.; Wehus, I. K.; Racine, B. +1 more
We propose an efficient Bayesian Markov chain Monte Carlo (MCMC) algorithm for estimating cosmological parameters from cosmic microwave background (CMB) data without the use of likelihood approximations. It builds on a previously developed Gibbs sampling framework that allows for exploration of the joint CMB sky signal and power spectrum posterior…
Compact planetary nebulae in the Galactic disk: Analysis of the central stars
Villaver, Eva; Shaw, Richard A.; Stanghellini, Letizia +1 more
Context. We have obtained multi-wavelength observations of compact Galactic planetary nebulae (PNe) to probe post-asymptotic giant branch (AGB) evolution from the onset of nebular ejection. Here we analyze new observations from HST to derive the masses and evolutionary status of their central stars (CSs).
Aims: Our objective here is to derive…
Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS
Eastwood, J. P.; Fujimoto, M.; Phan, T. D. +4 more
This paper describes the efforts of our Inter-Disciplinary Scientist (IDS) team to (a) establish the large-scale context for reconnection diffusion region encounters by MMS at the magnetopause and in the magnetotail, including the distinction between X-line and O-line encounters, that would help the identification of diffusion regions in spacecraf…
No statistical evidence of lightning in Venus night-side atmosphere from VIRTIS-Venus Express Visible observations
Piccioni, G.; Grassi, D.; García Muñoz, A. +2 more
In this study we describe a dedicated analysis of luminous transient events on Venus night side atmosphere with the visible channel of the VIRTIS instrument (280-1100 nm), this being the most comprehensive search of lightning conducted so far with Venus Express data. Our search results in thousands of signal detections, but unfortunately they can …
The dust properties and physical conditions of the interstellar medium in the LMC massive star-forming complex N11
Lebouteiller, V.; Madden, S. C.; Galliano, F. +19 more
We combine Spitzer and Herschel data of the star-forming region N11 in the Large Magellanic Cloud (LMC) to produce detailed maps of the dust properties in the complex and study their variations with the interstellar-medium conditions. We also compare Atacama Pathfinder EXperiment/Large APEX Bolometer Camera (APEX/LABOCA) 870 µm observations …
Relaxation Processes within Flux Ropes in Solar Wind
Perri, S.; Bruno, R.; Carbone, V. +3 more
Flux ropes are localized structures in space plasma whose tube-like organized magnetic configuration can be well approximated by a force-free field model. Both numerical simulations and simple models suggest that the ideal magnetohydrodynamics (MHD) can relax toward a minimum energy state, where magnetic helicity is conserved, characterized by for…
Detection of a Dearth of Stars with Zero Angular Momentum in the Solar Neighborhood
Bovy, Jo; Hunt, Jason A. S.; Carlberg, Raymond G.
We report on the detection in the combined Gaia-DR1/RAVE data of a lack of disk stars in the solar neighborhood with velocities close to zero angular momentum. We propose that this may be caused by the scattering of stars with very low angular momentum onto chaotic, halo-type orbits when they pass through the Galactic nucleus. We model the effect …