Search Publications

The origin of organic emission in NGC 2071

Johnstone, D.; Fich, M.; McCoey, C. +2 more

Context. The physical origin behind organic emission lines in embedded low-mass star formation has been fiercely debated over the last two decades. A multitude of scenarios have been proposed, from a hot corino to PDRs on cavity walls to shock excitation.
Aims: The aim of this paper is to determine the location and the corresponding physical …

Constraining primordial vector mode from B-mode polarization

Saga, Shohei; Shiraishi, Maresuke; Ichiki, Kiyotomo

The B-mode polarization spectrum of the Cosmic Microwave Background (CMB) may be the smoking gun of not only the primordial tensor mode but also of the primordial vector mode. If there exist nonzero vector-mode metric perturbations in the early Universe, they are known to be supported by anisotropic stress fluctuations of free-streaming particles …

Numerical simulations of stellar jets and comparison between synthetic and observed maps: clues to the launch mechanism

Bacciotti, F.; Maurri, L.; Rubini, F. +2 more

High angular resolution spectra obtained with the Hubble Space Telescope Imaging Spectrograph (HST/STIS) provide rich morphological and kinematical information about the stellar jet phenomenon, which allows us to test theoretical models efficiently. In this work, numerical simulations of stellar jets in the propagation region are executed with the…

1D-FDTD Characterization of Ionosphere Influence on Ground Penetrating Radar Data Inversion

Seu, Roberto; Picardi, Giovanni; Restano, Marco

Declinations in the Almagest: accuracy, epoch, and observers

Brandt, John C.; Zimmer, Peter; Jones, Patricia B.

Almagest declinations attributed to Timocharis, Aristyllos, Hipparchus, and Ptolemy are investigated through comparisons of the reported declinations with the declinations computed from modern positions translated to the earlier epochs. Consistent results indicate an observational accuracy of ≈ 0.1° and epochs of: Timocharis, c. 298 BC; Aristyllos…

Solar wind-driven thermospheric winds over the Venus North Polar region

Fedorov, A.; Barabash, S.; Lundin, R. +3 more

Data from the neutral particle imager (NPI) on Venus Express reveals the presence of a persistent +Y (Venus Solar-Oriented) flow of Energetic Neutral Atoms (ENAs) in the Venus polar thermosphere. The overall flow morphology and altitude distribution of ENAs, solar wind H⁺ (SWH⁺), and ionospheric O⁺ imply that SWH

BICEP's acceleration

Contaldi, Carlo R.

The recent Bicep2 [1] detection of, what is claimed to be primordial B-modes, opens up the possibility of constraining not only the energy scale of inflation but also the detailed acceleration history that occurred during inflation. In turn this can be used to determine the shape of the inflaton potential V(ϕ) for the first time - if a single, sca…

X-ray emission from the galactic supernova remnant G12.0-0.1

Koyama, Katsuji; Bamba, Aya; Yamauchi, Shigeo

We present results of the Suzaku/XIS observation around the radio supernova remnant (SNR) G12.0-0.1. No significant diffuse emission extending in or along the radio shell was observed. Instead, two compact X-ray sources, Suzaku J181205-1835 and Suzaku J181210-1842, were found in or near G12.0-0.1. Suzaku J181205-1835 is located at the north-west o…

Outflow and plasma acceleration in Titan's induced magnetotail: Evidence of magnetic tension forces

Kurth, W. S.; Leblanc, F.; Edberg, N. J. T. +11 more

Cassini plasma wave and particle observations are combined with magnetometer measurements to study Titan's induced magnetic tail. In this study, we report and analyze the plasma acceleration in Titan's induced magnetotail observed in flybys T17, T19, and T40. Radio and Plasma Wave Science observations show regions of cold plasma with electron dens…

Spectroscopic Study of a Dark Lane and a Cool Loop in a Solar Limb Active Region by Hinode/EIS

Moon, Y. -J.; Lee, Kyoung-Sun; Lee, Jin-Yi +1 more

We investigated a cool loop and a dark lane over a limb active region on 2007 March 14 using the Hinode/EUV Imaging Spectrometer. The cool loop is clearly seen in the spectral lines formed at the transition region temperature. The dark lane is characterized by an elongated faint structure in the coronal spectral lines and is rooted on a bright poi…