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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…
Cassini observations of ionospheric photoelectrons at large distances from Titan: Implications for Titan's exospheric environment and magnetic tail
Lewis, G. R.; Coates, A. J.; Jones, G. H. +6 more
Discrete peaks near 24.1 eV are seen in electron spectra measured in Titan's ionosphere by the ELS (Electron Spectrometer), part of the Cassini Plasma Spectrometer (CAPS), and are interpreted as photoelectrons. These photoelectrons are generated as a result of ionization of N2 by the strong solar He II (30.4 nm) line. They are generally…
The influence of spectral solar irradiance data on stratospheric heating rates during the 11 year solar cycle
Weber, M.; Solanki, S. K.; Krivova, N. A. +7 more
Heating rate calculations with the FUBRad shortwave (SW) radiation parameterization have been performed to examine the effect of prescribed spectral solar fluxes from the NRLSSI, MPS and IUP data sets on SW heating rates over the 11 year solar cycle 22. The corresponding temperature response is derived from perpetual January General Circulation Mo…
Model Selection for Spectropolarimetric Inversions
Orozco Suárez, D.; Asensio Ramos, A.; Martínez González, M. J. +3 more
Inferring magnetic and thermodynamic information from spectropolarimetric observations relies on the assumption of a parameterized model atmosphere whose parameters are tuned by comparison with observations. Often, the choice of the underlying atmospheric model is based on subjective reasons. In other cases, complex models are chosen based on obje…
The Kinematics of HH 34 from HST Images with a Nine-year Time Baseline
Stapelfeldt, K. R.; Raga, A. C.; Lora, V. +3 more
We study archival HST [S II] 6716+30 and Hα images of the HH 34 outflow, taken in 1998.71 and in 2007.83. The ~9 yr time baseline and the high angular resolution of these observations allow us to carry out a detailed proper-motion study. We determine the proper motions of the substructure of the HH 34S bow shock (from the [S II] and Hα frames) and…
LBQS 0103-2753: A Binary Quasar in a Major Merger
Junkkarinen, V.; Shields, G. A.; Chapman, S. C. +3 more
We present Hubble Space Telescope (HST) and United Kingdom Infrared Telescope spectra and images of the 2 kpc (0farcs3) binary quasar LBQS 0103-2753 (z = 0.858). The HST images (V and I bands) show tidal features demonstrating that this system is a major galaxy merger in progress. A two-color composite image brings out knots of star formation alon…