Search Publications
Interpretation of HINODE SOT/SP asymmetric Stokes profiles observed in the quiet Sun network and internetwork
Sánchez Almeida, J.; Berrilli, F.; Del Moro, D. +1 more
Stokes profiles emerging from the magnetized solar photosphere and observed by SOT/SP aboard the HINODE satellite exhibit a variety of complex shapes. These are indicative of unresolved magnetic structures that have been overlooked in the inversion analyses performed so far. Here we present the first interpretation of the Stokes profile asymmetrie…
Imaging the circumstellar dust around AGB stars with PolCor
Olofsson, G.; Olofsson, H.; Schöier, F. L. +2 more
Aims: The aim of this paper is to investigate how the new imaging Polarimeter and Coronograph (PolCor) at the Nordic Optical Telescope (NOT) can be used in the study of circumstellar structures around AGB stars. The purpose is to prepare for a study of a larger sample.
Methods: We have observed two types of AGB stars using the PolCor ins…
Observing and modeling the dynamic atmosphere of the low mass-loss C-star R Sculptoris at high angular resolution
Höfner, S.; Verhoelst, T.; Hron, J. +4 more
Context. We study the circumstellar environment of the carbon-rich star R Sculptoris using the near- and mid-infrared high spatial resolution observations from the ESO-VLTI focal instruments VINCI and MIDI, respectively.
Aims: These observations aim at increasing our knowledge of the dynamic processes in play within the very close circumstell…
Discovery of a Super-Li-rich Turnoff Star in the Metal-poor Globular Cluster NGC 6397
Lind, Karin; Rich, R. Michael; Koch, Andreas
We report on the discovery of a super-Li-rich turnoff (TO) star in the old (12 Gyr), metal-poor ([Fe/H] = -2.1 dex) globular cluster (GC) NGC 6397, based on high-resolution MIKE/Magellan spectra. This star shows an unusually high lithium abundance of A(Li)NLTE = 4.03 ± 0.06 ± 0.14 dex (or, 4.21, accounting for possible contamination fro…
Hinode/EIS plasma diagnostics in the flaring solar chromosphere
Fletcher, L.; Hannah, I. G.; Graham, D. R.
Context. The impulsive phase of solar flares is a time of rapid energy deposition and heating in the lower solar atmosphere, leading to changes in the temperature, density, ionisation and velocity structure of this region.
Aims: We aim to study the lower atmosphere during the impulsive phase of a flare using imaging and spectroscopic data fro…
HerMES: detection of cosmic magnification of submillimetre galaxies using angular cross-correlation
Pérez-Fournon, I.; Rodighiero, G.; Ivison, R. J. +37 more
Cosmic magnification is due to the weak gravitational lensing of sources in the distant Universe by foreground large-scale structure leading to coherent changes in the observed number density of the background sources. Depending on the slope of the background source number counts, cosmic magnification causes a correlation between the background an…
On the evolution of environmental and mass properties of strong lens galaxies in COSMOS
Finoguenov, A.; Kneib, J. -P.; Ilbert, O. +11 more
Context. Nearly 100 new strong-lens candidates have been discovered in the COSMOS field. Among these, 20 lens candidates with 0.34 ≲ zlens ≲ 1.13 feature multiple images of background sources.
Aims: Using the multi-wavelength coverage of the field and its spectroscopic follow-up, we characterize the evolution with redshift of the e…
The production of Titan's ultraviolet nitrogen airglow
Esposito, Larry W.; Gustin, Jacques; Bradley, E. Todd +11 more
The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed Titan's dayside limb in the extreme ultraviolet (EUV) and far ultraviolet (FUV) on 22 June 2009 from a mean distance of 23 Titan radii. These high-quality observations reveal the same EUV and FUV emissions arising from photoelectron excitation and photofragmentation of molecular nitrogen…
Abell 611. II. X-ray and strong lensing analyses
Giordano, F.; Ettori, S.; Gavazzi, R. +10 more
We present the results of our analyses of the X-ray emission and of the strong lensing systems in the galaxy cluster Abell 611 [z = 0.288]. This cluster is an optimal candidate for a comparison of the mass reconstructions obtained through X-ray and lensing techniques, because of its very relaxed dynamical appearance and its exceptional strong lens…
Coronal Seismology Using EIT Waves: Estimation of the Coronal Magnetic Field Strength in the Quiet Sun
Zhukov, A. N.; Dolla, L.; Rodriguez, L. +1 more
Coronal EIT waves have been observed for many years. The nature of EIT waves is still contentious, however, there is strong evidence that some of them might be fast magnetosonic waves, or at least have a fast magnetosonic wave component. The fast magnetosonic wave speed is formed from two components; the Alfvén speed (magnetic) and the sound speed…