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Effects of flare definitions on the statistics of derived flare distributions
Stegen, K.; Dominique, M.; Ryan, D. F. +2 more
The statistical examination of solar flares is crucial to revealing their global characteristics and behaviour. Such examinations can tackle large-scale science questions or give context to detailed single-event studies. However, they are often performed using standard but basic flare detection algorithms relying on arbitrary thresholds. This arbi…
Simulation tests of galaxy cluster constraints on chameleon gravity
Zhao, Gong-Bo; Bacon, David; Romer, A. Kathy +3 more
We use two new hydrodynamical simulations of Λ cold dark matter (ΛCDM) and f(R) gravity to test the methodology used by Wilcox et al. (W15) in constraining the effects of a fifth force on the profiles of clusters of galaxies. We construct realistic simulated stacked weak lensing and X-ray surface brightness cluster profiles from these cosmological…
Quantum cosmology and the evolution of inflationary spectra
Kamenshchik, Alexander Y.; Tronconi, Alessandro; Venturi, Giovanni
We illustrate how it is possible to calculate the quantum gravitational effects on the spectra of primordial scalar/tensor perturbations starting from the canonical, Wheeler-De Witt, approach to quantum cosmology. The composite matter-gravity system is analyzed through a Born-Oppenheimer approach in which gravitation is associated with the heavy d…
Differences in the Structural Properties and Star-formation Rates of Field and Cluster Galaxies at z~1
Allen, Rebecca J.; Kacprzak, Glenn G.; Glazebrook, Karl +5 more
We investigate the dependence of galaxy sizes and star formation rates (SFRs) on their environment using a mass-limited sample of quiescent and star-forming galaxies with log(M */{M}⊙ ) ≥ 9.5 at \bar{z}=0.92 selected from the NEWFIRM medium-band Survey (NMBS). Using the Galaxy Environment Evolution Collaboration 2 spectroscop…
Cosmology with photometric weak lensing surveys: Constraints with redshift tomography of convergence peaks and moments
Haiman, Zoltán; May, Morgan; Petri, Andrea
Weak gravitational lensing is becoming a mature technique for constraining cosmological parameters, and future surveys will be able to constrain the dark energy equation of state w . When analyzing galaxy surveys, redshift information has proven to be a valuable addition to angular shear correlations. We forecast parameter constraints on the tripl…
Geologic mapping of the Comet 67P/Churyumov-Gerasimenko's Northern hemisphere
Jorda, L.; Lamy, P. L.; Lara, L. M. +52 more
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS), the scientific imaging system onboard the Rosetta mission, has been acquiring images of the nucleus of the comet 67P/Churyumov-Gerasimenko since 2014 August with a resolution which allows a detailed analysis of its surface. Indeed, data reveal a complex surface morphology whi…
On the Spin of the Black Hole in IC 10 X-1
Steiner, James F.; McClintock, Jeffrey E.; Middleton, Matthew J. +5 more
The compact X-ray source in the eclipsing X-ray binary IC 10 X-1 has reigned for years as ostensibly the most massive stellar-mass black hole, with a mass estimated to be about twice that of its closest rival. However, striking results presented recently by Laycock et al. reveal that the mass estimate, based on emission-line velocities, is unrelia…
Stratified NH and ND emission in the prestellar core 16293E in L1689N
Ceccarelli, C.; Caux, E.; Daniel, F. +6 more
Context. High degrees of deuterium fractionation are commonly found in cold prestellar cores and in the envelopes around young protostars. As it brings strong constraints to chemical models, deuterium chemistry is often used to infer core history or molecule formation pathways. Whereas a large number of observations are available regarding interst…
Spectrophotometry of the Khonsu region on the comet 67P/Churyumov-Gerasimenko using OSIRIS instrument images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +47 more
Our work focuses on the spectrophotometric analysis of selected terrain and bright patches in the Khonsu region on the comet 67P/Churyumov-Gerasimenko. Despite the variety of geological features, their spectrophotometric properties appear to indicate a similar composition. It is noticeable that the smooth areas in Khonsu possess similar spectropho…
Probing dark matter crests with white dwarfs and IMBHs
Schödel, R.; Amaro-Seoane, P.; Casanellas, J. +2 more
White dwarfs (WDs) are the most promising captors of dark matter (DM) particles in the crests that are expected to build up in the cores of dense stellar clusters. The DM particles could reach sufficient densities in WD cores to liberate energy through self-annihilation. The extinction associated with our Galactic Centre makes it impossible to det…