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NUSTAR Unveils a Heavily Obscured Low-luminosity Active Galactic Nucleus in the Luminous Infrared Galaxy NGC 6286
Sanders, D. B.; Stern, D.; Treister, E. +8 more
We report the detection of a heavily obscured active galactic nucleus (AGN) in the luminous infrared galaxy (LIRG) NGC 6286 identified in a 17.5 ks Nuclear Spectroscopic Telescope Array observation. The source is in an early merging stage and was targeted as part of our ongoing NuSTAR campaign observing local luminous and ultra-luminous infrared g…
Kinetic Alfvén turbulence below and above ion cyclotron frequency
Wu, D. J.; Zhao, J. S.; Voitenko, Y. M. +1 more
Alfvénic turbulent cascade perpendicular and parallel to the background magnetic field is studied accounting for anisotropic dispersive effects and turbulent intermittency. The perpendicular dispersion and intermittency make the perpendicular-wave-number magnetic spectra steeper and speed up production of high ion cyclotron frequencies by the turb…
Resolving Ionization and Metallicity on Parsec Scales across Mrk 71 with HST-WFC3
Aloisi, Alessandra; James, Bethan L.; Calzetti, Daniela +2 more
Blue compact dwarf (BCD) galaxies in the nearby universe provide a means for studying feedback mechanisms and star formation processes in low-metallicity environments in great detail. Owing to their vicinity, these local analogs to primordial young galaxies are well suited for high-resolution studies that are unfeasible for high-redshift galaxies.…
A model of short-lived outbursts on the 67P from fractured terrains
Keller, H. U.; Hartogh, P.; Rezac, L. +2 more
Aims: We develop a physical model to explain the potent outbursts that occurred in the fractured terrain of comet 67P near perihelion, and predict its temporal characteristics.
Methods: The feasibility of the proposed mechanism is studied using a numerical model accounting for the relevant microscopic/macroscopic processes. We rely on th…
Prediction of Geomagnetic Storm Strength from Inner Heliospheric In Situ Observations
Feng, L.; Möstl, C.; Eastwood, J. P. +4 more
Prediction of the effects of coronal mass ejections (CMEs) on Earth strongly depends on knowledge of the interplanetary magnetic field southward component, B z . Predicting the strength and duration of B z inside a CME with sufficient accuracy is currently impossible, forming the so-called B z problem. Here, w…
Cosmic microwave background and inflation in multi-fractional spacetimes
Calcagni, Gianluca; Kuroyanagi, Sachiko; Tsujikawa, Shinji
We use FIRAS and PLANCK 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with q-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor-to-scalar ratio, model-independent best fits of the black-body and scalar spectra yield upper l…
Integrated approach to cosmology: Combining CMB, large-scale structure, and weak lensing
Amara, Adam; Refregier, Alexandre; Nicola, Andrina
Recent observational progress has led to the establishment of the standard Λ CDM model for cosmology. This development is based on different cosmological probes that are usually combined through their likelihoods at the latest stage in the analysis. We implement here an integrated scheme for cosmological probes, which are combined in a common fram…
Measuring the Magnetic Field of Coronal Mass Ejections Near the Sun Using Pulsars
White, S. M.; Taylor, G. B.; Howard, T. A. +2 more
The utility of Faraday rotation to measure the magnetic field of the solar corona and large-scale transients within is a small, yet growing field in solar physics. This is largely because it has been recognized as a potentially valuable frontier in space weather studies, because the ability to measure the intrinsic magnetic field within coronal ma…
Annual Cosmic Ray Spectra from 250 MeV up to 1.6 GeV from 1995 - 2014 Measured with the Electron Proton Helium Instrument onboard SOHO
Gómez-Herrero, R.; Heber, B.; Kühl, P.
The solar modulation of galactic cosmic rays (GCR) can be studied in detail by examining long-term variations of the GCR energy spectrum (e.g. on the scales of a solar cycle). With almost 20 years of data, the Electron Proton Helium INstrument (EPHIN) onboard the SOlar and Heliospheric Observatory (SOHO) is well suited for this kind of investigati…
Multi-wavelength characterisation of z ~ 2 clustered, dusty star-forming galaxies discovered by Planck
Le Floc'h, E.; Dole, H.; Lagache, G. +9 more
We report the discovery of PHz G95.5-61.6, a complex structure detected in emission in the Planck all-sky survey that corresponds to two over-densities of high-redshift (I.e. z> 1) galaxies. This is the first source from the Planck catalogue of high-z candidates (proto-clusters and lensed systems) that has been completely characterised with fol…