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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…
Stripped Elliptical Galaxies as Probes of ICM Physics. III. Deep Chandra Observations of NGC 4552: Measuring the Viscosity of the Intracluster Medium
Churazov, E.; Forman, W. R.; Nulsen, P. E. J. +7 more
We present results from a deep (200 ks) Chandra observation of the early-type galaxy NGC 4552 (M89), which is falling into the Virgo cluster. Previous shallower X-ray observations of this galaxy showed a remnant gas core, a tail to the South of the galaxy, and twin “horns” attached to the northern edge of the gas core. In our deeper data, we detec…
The Warm Plasma Composition in the Inner Magnetosphere During 2012-2015
Spence, H. E.; Skoug, R. M.; Goldstein, J. +4 more
Ionospheric heavy ions play an important role in the dynamics of Earth's magnetosphere. The greater mass and gyroradius of ionospheric oxygen differentiates its behavior from protons at the same energies. Oxygen may have an impact on tail reconnection processes, and it can at least temporarily dominate the energy content of the ring current during…
Corotating Magnetic Reconnection Site in Saturn’s Magnetosphere
Lewis, G. R.; Coates, A. J.; Dougherty, M. K. +12 more
Using measurements from the Cassini spacecraft in Saturn’s magnetosphere, we propose a 3D physical picture of a corotating reconnection site, which can only be driven by an internally generated source. Our results demonstrate that the corotating magnetic reconnection can drive an expansion of the current sheet in Saturn’s magnetosphere and, conseq…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XI. The horizontal branch in NGC 6388 and NGC 6441
Salaris, M.; Di Criscienzo, M.; Anderson, J. +12 more
The Hubble Space Telescope UV Legacy survey of Galactic globular clusters (GC) is characterizing many different aspects of their multiple stellar populations. The `Grundahl-jump' (G-jump) is a discontinuity in ultraviolet brightness of blue horizontal branch (HB) stars, signalling the onset of radiative metal levitation. The HB Legacy data confirm…
Kinematics of Subluminous O and B Stars by Surface Helium Abundance
Jeffery, C. S.; Woolf, V. M.; Martin, P. +1 more
The majority of hot subdwarf stars are low-mass core-helium-burning stars. Their atmospheres are generally helium deficient; however, a minority have extremely helium-rich surfaces. An additional fraction have an intermediate surface-helium abundance, occasionally accompanied by peculiar abundances of other elements. We have identified a sample of…
HST and ground-based spectroscopy of quasar outflows: from mini-BALs to BALs
Shields, J. C.; Hamann, F.; Capellupo, D. M. +3 more
Quasar outflows have been posited as a mechanism to couple supermassive black holes to evolution in their host galaxies. We use multi-epoch spectra from the Hubble Space Telescope (HST) and ground-based observatories to study the outflows in seven quasars that have C IV outflow lines ranging from a classic broad absorption line (BAL) to weaker/nar…