Search Publications
Surface roughness of Titan's hydrocarbon seas
Lorenz, Ralph D.; Cassini Radar Team; Elachi, Charles +6 more
We derive fields of solutions for the surface properties (roughness and permittivity) of the liquid hydrocarbon bodies Ligeia, Kraken and Punga Mare on Titan by applying the Radar Statistical Reconnaissance (RSR) technique to the Cassini RADAR observations in altimeter mode during the northern early summer. At the time of observation, Kraken and L…
Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing
Gandhi, Poshak; Tsygankov, Sergey S.; Poutanen, Juri +5 more
We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by…
Solar Ellerman Bombs in 1D Radiative Hydrodynamics
Doyle, J. G.; Mathioudakis, M.; Reid, A. +2 more
Recent observations from the Interface Region Imaging Spectrograph appear to show impulsive brightenings in high temperature lines, which when combined with simultaneous ground-based observations in Hα, appear co-spatial to Ellerman Bombs (EBs). We use the RADYN one-dimensional radiative transfer code in an attempt to try and reproduce the observe…
Detection of an ∼20 kpc coherent magnetic field in the outskirt of merging spirals: the Antennae galaxies
Mao, S. A.; Zweibel, Ellen G.; Basu, Aritra +3 more
We present a study of the magnetic field properties of NGC 4038/9 (the `Antennae' galaxies), the closest example of a late stage merger of two spiral galaxies. Wideband polarimetric observations were performed using the Karl G. Jansky Very Large Array between 2 and 4 GHz. Rotation measure synthesis and Faraday depolarization analysis was performed…
Baryons still trace dark matter: Probing CMB lensing maps for hidden isocurvature
Muñoz, Julian B.; Grin, Daniel; Smith, Tristan L. +2 more
Compensated isocurvature perturbations (CIPs) are primordial fluctuations that balance baryon and dark-matter isocurvature to leave the total matter density unperturbed. The effects of CIPs on the cosmic microwave background (CMB) anisotropies are similar to those produced by weak lensing of the CMB: smoothing of the power spectrum and generation …
Constraining f (R ) gravity with Sunyaev-Zel'dovich clusters detected by the Planck satellite
Viel, Matteo; Peirone, Simone; Raveri, Marco +2 more
Clusters of galaxies have the potential of providing powerful constraints on possible deviations from General Relativity. We use the catalog of Sunyaev-Zel'dovich (SZ) sources detected by Planck and consider a correction to the halo mass function for a f (R ) class of modified gravity models, which has been recently found to reproduce well results…
Dwarf spheroidal J-factors without priors: A likelihood-based analysis for indirect dark matter searches
Cohen-Tanugi, J.; Conrad, J.; Anderson, B. +3 more
Line-of-sight integrals of the squared density, commonly called the J-factor, are essential for inferring dark matter (DM) annihilation signals. The J-factors of DM-dominated dwarf spheroidal satellite galaxies (dSphs) have typically been derived using Bayesian techniques, which for small data samples implies that a choice of priors constitutes a …
A possibly universal red chromophore for modeling color variations on Jupiter
Baines, K. H.; Sromovsky, L. A.; Carlson, R. W. +1 more
A new laboratory-generated chemical compound made from photodissociated ammonia (NH3) molecules reacting with acetylene (C2H2) was suggested as a possible coloring agent for Jupiter's Great Red Spot (GRS) by Carlson et al. (2016, Icarus 274, 106-115). Baines et al. (2016, Icarus, submitted) showed that the GRS spec…
Testing non-minimally coupled inflation with CMB data: a Bayesian analysis
Benetti, Micol; Alcaniz, Jailson; Campista, Marcela
We use the most recent cosmic microwave background (CMB) data to perform a Bayesian statistical analysis and discuss the observational viability of inflationary models with a non-minimal coupling, ξ, between the inflaton field and the Ricci scalar. We particularize our analysis to two examples of small and large field inflationary models, namely, …
High-resolution spectroscopy of the extended narrow-line region of IC 5063 and NGC 7212
La Mura, G.; Ciroi, S.; Cracco, V. +6 more
We studied the properties of the gas of the extended narrow-line region (ENLR) of two Seyfert 2 galaxies: IC 5063 and NGC 7212. We analysed high-resolution spectra to investigate how the main properties of this region depend on the gas velocity. We divided the emission lines in velocity bins and we calculated several line ratios. Diagnostic diagra…