Search Publications
Gamma-ray burst optical light-curve zoo: comparison with X-ray observations
Chincarini, G.; Bernardini, M. G.; Margutti, R. +2 more
Aims: We present a comprehensive analysis of the optical and X-ray light curves (LCs) and spectral energy distributions (SEDs) of a large sample of gamma-ray burst (GRB) afterglows to investigate the relationship between the optical and X-ray emission after the prompt phase. We consider all data available in the literature, which where obtain…
Propagating Waves Transverse to the Magnetic Field in a Solar Prominence
Schmieder, B.; Kucera, T. A.; Knizhnik, K. +3 more
We report an unusual set of observations of waves in a large prominence pillar that consist of pulses propagating perpendicular to the prominence magnetic field. We observe a huge quiescent prominence with the Solar Dynamics Observatory Atmospheric Imaging Assembly in EUV on 2012 October 10 and only a part of it, the pillar, which is a foot or bar…
Tight Correlations between Massive Galaxy Structural Properties and Dynamics: The Mass Fundamental Plane was in Place by z ~ 2
van Dokkum, Pieter G.; Franx, Marijn; Bezanson, Rachel +3 more
The fundamental plane (FP) is an empirical relation between the size, surface brightness, and velocity dispersion of early-type galaxies. This relation has been studied extensively for early-type galaxies in the local universe to constrain galaxy formation mechanisms. The evolution of the zero point of this plane has been extended to high redshift…
Constraints on the Brans-Dicke gravity theory with the Planck data
Chen, Xuelei; Li, Yi-Chao; Wu, Feng-Quan
Based on the new cosmic microwave background temperature data from the Planck satellite, the nine-year polarization data from the Wilkinson Microwave Anisotropy Probe, and the baryon acoustic oscillation distance ratio data from the Sloan Digital Sky Survey and Six-Degree-Field surveys, we place a new constraint on the Brans-Dicke theory. We adopt…
The accretion flow to the intermittent accreting millisecond pulsar, HETE J1900.1-2455, as observed by XMM-Newton and RXTE
Egron, E.; Papitto, A.; Di Salvo, T. +6 more
We present a study of the accretion flow to the intermittent accreting millisecond pulsar, HETE J1900.1-2455, based on observations made simultaneously by XMM-Newton and RXTE. The 0.33-50 keV energy spectrum is described by the sum of a hard Comptonized component produced in an optically thin τ ≃ 1 corona, a soft thermal kTin ≃ 0.2 keV …
Detecting Nanoflare Heating Events in Subarcsecond Inter-moss Loops Using Hi-C
Golub, Leon; Winebarger, Amy R.; De Pontieu, Bart +10 more
The High-resolution Coronal Imager (Hi-C) flew aboard a NASA sounding rocket on 2012 July 11 and captured roughly 345 s of high-spatial and temporal resolution images of the solar corona in a narrowband 193 Å channel. In this paper, we analyze a set of rapidly evolving loops that appear in an inter-moss region. We select six loops that both appear…
Light sterile neutrinos in cosmology and short-baseline oscillation experiments
Gariazzo, S.; Giunti, C.; Laveder, M.
We analyze the most recent cosmological data, including Planck, taking into account the possible existence of a sterile neutrino with a mass at the eV scale indicated by short-baseline neutrino oscillations data in the 3+1 framework. We show that the contribution of local measurements of the Hubble constant induces an increase of the value of the …
A ~ 3.8 hr Periodicity from an Ultrasoft Active Galactic Nucleus Candidate
Lin, Dacheng; Godet, Olivier; Webb, Natalie A. +2 more
Very few galactic nuclei are found to show significant X-ray quasi-periodic oscillations (QPOs). After carefully modeling the noise continuum, we find that the ~3.8 hr QPO in the ultrasoft active galactic nucleus candidate 2XMM J123103.2+110648 was significantly detected (~5σ) in two XMM-Newton observations in 2005, but not in the one in 2003. The…
Conditions at the magnetopause of Saturn and implications for the solar wind interaction
Delamere, P. A.; Bagenal, F.; Desroche, M. +1 more
Using idealized models of the magnetosheath and magnetospheric magnetic fields, plasma densities, and plasma flow, we test for the steady state viability of processes mediating the interaction between the solar wind and the magnetosphere of Saturn. The magnetopause is modeled as an asymmetric paraboloid with a standoff distance of ∼25 RS
Unveiling a Population of Galaxies Harboring Low-mass Black Holes with X-Rays
Silverman, J. D.; Brandt, W. N.; Xue, Y. Q. +7 more
We report the discovery of three low-mass black hole (BH) candidates residing in the centers of low-mass galaxies at z < 0.3 in the Chandra Deep Field-South Survey. These BHs are initially identified as candidate active galactic nuclei based on their X-ray emission in deep Chandra observations. Multi-wavelength observations are used to strength…