Search Publications
Understanding shock dynamics in the inner heliosphere with modeling and Type II radio data: The 2010-04-03 event
St. Cyr, O. C.; Odstrcil, D.; Gopalswamy, N. +3 more
The 2010 April 03 solar event was studied using observations from STEREO SECCHI, SOHO LASCO, and Wind kilometric Type II data (kmTII) combined with WSA-Cone-ENLIL model simulations performed at the Community Coordinated Modeling Center (CCMC). In particular, we identified the origin of the coronal mass ejection (CME) using STEREO EUVI and SOHO EIT…
On the prospective detection of polyoxymethylene in comet 67P/Churyumov-Gerasimenko with the COSIMA instrument onboard Rosetta
Briois, Christelle; Cottin, Hervé; Fray, Nicolas +5 more
The presence of polyoxymethylene (POM) in cometary grains has been debated years ago. Although never proven, its presence can not be excluded. Rosetta, the ESA mission to comet 67P/Churyumov-Gerasimenko, may answer this question. On board the spacecraft, COSIMA (COmetary Secondary Ion Mass Analyzer) will analyze the grains ejected from the nucleus…
The continuum intensity as a function of magnetic field. II. Local magnetic flux and convective flows
Solanki, S. K.; Borrero, J. M.; Kobel, P.
Context. To deepen our understanding of the role of small-scale magnetic fields in active regions (ARs) and in the quiet Sun (QS) on the solar irradiance, it is fundamental to investigate the physical processes underlying their continuum brightness. Previous results showed that magnetic elements in the QS reach larger continuum intensities than in…
Dynamics of long-period ULF waves in the plasma sheet: Coordinated space and ground observations
Zhang, T. L.; Nakamura, R.; Baumjohann, W. +11 more
Spacecraft and ground-based observations are used to study characteristics of ultralow frequency waves in the plasma sheet from the postmidnight to morning local time sectors in the terrestrial magnetosphere. Field line resonance (FLR) type oscillations with discrete and latitude-dependent frequencies in the ranges of 1.7-2.0 and 3.0-3.2 mHz are o…
Auto-consistent metallicity and star formation history of the nearest blue compact dwarf galaxy NGC 6789
Pérez-Montero, E.; García-Benito, R.
We present a detailed auto-consistent study of the nearest blue compact dwarf galaxy NGC 6789 by means of optical and ultraviolet (UV) archive photometry data and optical long-slit Intermediate dispersion Spectrograph and Imaging System-William Herschel Telescope (WHT) spectroscopy observations of the five brightest star-forming knots. The analysi…
Riding the wake of a merging galaxy cluster
Fabian, A. C.; McNamara, B. R.; Russell, H. R. +7 more
Using William Herschel Telescope (WHT) Optically Adaptive System for Imaging Spectroscopy (OASIS) integral field unit observations, we report the discovery of a thin plume of ionized gas extending from the brightest cluster galaxy (BCG) in Abell 2146 to the subcluster X-ray cool core which is offset from the BCG by ∼37 kpc. The plume is greater th…
Forecasting a CME by Spectroscopic Precursor?
van Driel-Gesztelyi, L.; Baker, D.; Green, L. M.
Multi-temperature plasma flows resulting from the interaction between a mature active region (AR) inside an equatorial coronal hole (CH) are investigated. Outflow velocities observed by Hinode EIS ranged from a few to 13 km s−1 for three days at the AR's eastern and western edges. However, on the fourth day, velocities intensified up to…
Multi-Wavelength Photometric and Polarimetric Observations of the Outburst of 3C 454.3 in 2009 December
Fukazawa, Yasushi; Sakon, Itsuki; Sasada, Mahito +11 more
In 2009 December, the bright blazar 3C 454.3 exhibited a strong outburst in the optical, X-ray, and gamma-ray regions. We performed photometric and polarimetric monitoring of this outburst in the optical and near-infrared bands with TRISPEC and HOWPol attached to the Kanata telescope. We also observed this outburst in the infrared band with AKARI,…
An HST Imaging Survey of Low-mass Stars in the Chamaeleon I Star-forming Region
Apai, D.; Pascucci, I.; Robberto, M. +7 more
We present new Hubble Space Telescope/WFPC2 observations of 20 fields centered around T Tauri stars in the Chamaeleon I star-forming region. Images have been obtained in the F631N ([O I] λ6300), F656N (Hα), and F673N ([S II] λλ6716, 6731) narrow-band filters, plus the Johnson V-band equivalent F547M filter. We detect 31 T Tauri stars falling withi…
The spectroscopic orbits and physical parameters of GG Carinae
Ferrer, O. E.; Quiroga, C.; Brandi, E. +3 more
Aims: GG Car is an eclipsing binary classified as a B[e] supergiant star. The aims of our study are to improve the orbital elements of the binary system in order to obtain the actual orbital period of this system. We also compare the spectral energy distribution of the observed fluxes over a wide wavelength range with a model of a circumstell…