Search Publications
Clustering of submillimetre galaxies in a self-regulated baryon collapse model
Danese, L.; Negrello, M.; Lapi, A. +3 more
We investigate anisotropies in the cosmic infrared background (CIB) using a combination of the physical evolutionary model for proto-spheroid galaxies of Granato et al. and an independent halo occupation distribution analysis. After having re-calibrated the cumulative flux function dS/dz at ?m using the available determinations of the shot-noise a…
NGC 454: unveiling a new 'changing look' active galactic nucleus
Braito, V.; Caccianiga, A.; Severgnini, P. +2 more
We present a detailed analysis of the X-ray spectrum of the Seyfert 2 galaxy NGC 454E, belonging to the interacting system NGC 454. Observations performed with Suzaku, XMM-Newton and Swift allowed us to detect a dramatic change in the curvature of the 2-10 keV spectrum, revealing a significant variation of the absorbing column density along the li…
Simultaneous X-ray and optical observations of true type 2 Seyfert galaxies
Wolter, Anna; Bianchi, Stefano; La Franca, Fabio +9 more
We present the results of a campaign of simultaneous X-ray and optical observations of 'true' type 2 Seyfert galaxies candidates, i.e. active galactic nuclei without a broad-line region (BLR). Out of the initial sample composed of eight sources, one object, IC 1631, was found to be a misclassified starburst galaxy, another, Q2130-431, does show br…
The SOPHIE search for northern extrasolar planets. IV. Massive companions in the planet-brown dwarf boundary
Bouchy, F.; Moutou, C.; Queloz, D. +20 more
Context. The mass domain where massive extrasolar planets and brown dwarfs lie is still poorly understood. Indeed, not even a clear dividing line between massive planets and brown dwarfs has been established yet. This is partly because these objects are very scarce in close orbits around solar-type stars, the so-called brown dwarf desert. Owing to…
Orbital Decay and Evidence of Disk Formation in the X-Ray Binary Pulsar OAO 1657-415
Wilson-Hodge, C. A.; Camero-Arranz, A.; Finger, M. H. +1 more
OAO 1657-415 is an eclipsing X-ray binary wind-fed pulsar that has exhibited smooth spin-up/spin-down episodes and has undergone several torque reversals throughout its long history of observation. We present a frequency history spanning nearly 19 years of observations from the Burst and Transient Source Experiment and from the Gamma-Ray Burst Mon…
Chorus wave-normal statistics in the Earth's radiation belts from ray tracing technique
Krasnoselskikh, V.; Breuillard, H.; Agapitov, O. +3 more
Discrete ELF/VLF (Extremely Low Frequency/Very Low Frequency) chorus emissions are one of the most intense electromagnetic plasma waves observed in radiation belts and in the outer terrestrial magnetosphere. These waves play a crucial role in the dynamics of radiation belts, and are responsible for the loss and the acceleration of energetic electr…
The North Ecliptic Pole Wide survey of AKARI: a near- and mid-infrared source catalog
Im, M.; Lee, H. M.; White, G. J. +19 more
We present a photometric catalog of infrared (IR) sources based on the North Ecliptic Pole Wide field (NEP-Wide) survey of AKARI, which is an infrared space telescope launched by Japan. The NEP-Wide survey covered 5.4 deg2 area, a nearly circular shape centered on the NEP, using nine photometric filter-bands from 2-25 µm of the In…
Active Learning to Overcome Sample Selection Bias: Application to Photometric Variable Star Classification
Miller, Adam A.; Bloom, Joshua S.; Richards, Joseph W. +6 more
Despite the great promise of machine-learning algorithms to classify and predict astrophysical parameters for the vast numbers of astrophysical sources and transients observed in large-scale surveys, the peculiarities of the training data often manifest as strongly biased predictions on the data of interest. Typically, training sets are derived fr…
Predictions of Energy and Helicity in Four Major Eruptive Solar Flares
Qiu, Jiong; Longcope, Dana W.; Kazachenko, Maria D. +1 more
In order to better understand the solar genesis of interplanetary magnetic clouds (MCs), we model the magnetic and topological properties of four large eruptive solar flares and relate them to observations. We use the three-dimensional Minimum Current Corona model (Longcope, 1996, Solar Phys.169, 91) and observations of pre-flare photospheric magn…
Ammonia clathrate hydrates as new solid phases for Titan, Enceladus, and other planetary systems
Kumar, R.; Shin, K.; Udachin, K. A. +2 more