Search Publications
Overview of an extensive multi-wavelength study of GX 339-4 during the 2010 outburst
D'Avanzo, P.; Goldoni, P.; Rahoui, F. +8 more
Context. The microquasar GX 339-4 experienced a new outburst in 2010: it was observed simultaneously at various wavelengths from radio up to soft γ-rays. We focus on observations that are quasi-simultaneous with those made with the INTEGRAL and RXTE satellites: these were collected in 2010 March-April during our INTEGRAL target of opportunity prog…
Twelve-hour spikes from the Crab Pevatron
Walter, R.; Ferrigno, C.; Balbo, M. +1 more
Aims: The
Methods: We divide the available data into three different sets, corres…
Dynamics and plasma properties of an X-ray jet from SUMER, EIS, XRT, and EUVI A & B simultaneous observations
Madjarska, M. S.
Context. Small-scale transient phenomena in the quiet Sun are believed to play an important role in coronal heating and solar wind generation. One of them, called “X-ray jet”, is the subject of our study.
Aims: We intend to investigate the dynamics, evolution, and physical properties of this phenomenon.
Methods: We combine multi-instrume…
Low abundance, strong features: window-dressing crystalline forsterite in the disk wall of HD 100546
Waters, L. B. F. M.; Dominik, C.; Henning, Th. +10 more
Context. Forsterite is one of the crystalline dust species that is often observed in protoplanetary disks and solar system comets. Being absent in the interstellar medium, it must be produced during the disk lifetime. It can therefore serve as a tracer of dust processing and disk evolution, which can lead to a better understanding of the physical …
Advection and dispersal of small magnetic elements in the very quiet Sun
Asensio Ramos, A.; Martínez González, M. J.; Manso Sainz, R.
We track small magnetic structures on very quiet regions (internetwork) of the Sun. We follow the footpoints of small-scale magnetic loops that appear on the photosphere at granular scales using spectropolarimetric and magnetographic data obtained with Hinode. We find two different regimes for their wanderings. Within granules (where they appear),…
The nature of nuclear Hα emission in LINERs
González-Martín, O.; Márquez, I.; Masegosa, J. +1 more
To get insight into the nature of the ionized gas in the nuclear region of LINERs, we performed a study of HST Hα imaging of 32 LINERs. The main conclusion from this analysis is that, for the large majority of LINERs (84%), an unresolved nuclear source has been identified along with extended emission with equivalent sizes ranging from a few tens t…
Relationship between multiple type II solar radio bursts and CME observed by STEREO/SECCHI
Cho, K. -S.; Moon, Y. -J.; Shanmugaraju, A. +3 more
Aims: Two or more type II bursts are occasionally observed in close time sequence during solar eruptions, which are known as multiple type II bursts. The origin of the successive burst has been interpreted in terms of coronal mass ejections (CMEs) and/or flares. Detailed investigations of the relationship between CMEs and the bursts enable us…
Collapsed, uncollapsed, and hidden magnetic flux on the quiet Sun
Stenflo, J. O.
Since the first applications of the Stokes V line ratio in the early 1970s and the Hanle depolarization effect in the early 1980s we have had a dualistic view of quiet-Sun magnetism: intermittent kG flux tubes surrounded by an ocean of turbulent fields with strengths of order 10-100 G. There has been the concern that this dualism could be an artef…
HESS J1943+213: a candidate extreme BL Lacertae object
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +199 more
Context. The H.E.S.S. Cherenkov telescope array has been surveying the Galactic plane for new VHE (>100 GeV) gamma-ray sources.
Aims: We report on a newly detected point-like source, HESS J1943+213. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which was proposed to have radio and infrared counterparts.
…
On the degeneracy of the tidal Love number k2 in multi-layer planetary models: application to Saturn and GJ 436b
Stevenson, D. J.; Nettelmann, N.; Kramm, U. +1 more
Context. In order to accurately model giant planets, a whole set of observational constraints is needed. As the conventional constraints for extrasolar planets like mass, radius, and temperature allow for a large number of acceptable models, a new planetary parameter is desirable in order to further constrain planetary models. Such a parameter may…