Search Publications
Visual and ultraviolet flux variability of the bright CP star θ Aurigae
Krtička, J.; Lüftinger, T.; Mikulášek, Z. +1 more
Context. Chemically peculiar stars of the upper part of the main sequence show periodical variability in line intensities and continua, modulated by the stellar rotation, which is attributed to the existence of chemical spots on the surface of these stars. The flux variability is caused by the changing redistribution rate of the radiative flux pre…
The nuclear gas disk of NGC 1566 dissected by SINFONI and ALMA
Moser, L.; Combes, F.; García-Burillo, S. +5 more
We present the results of near-infrared (NIR) H- and K-band European Southern Observatory SINFONI integral field spectroscopy (IFS) of the Seyfert galaxy
Identification of new transitional disk candidates in Lupus with Herschel
Prusti, T.; Pilbratt, G. L.; Bouy, H. +4 more
Context. New data from the Herschel Space Observatory are broadening our understanding of the physics and evolution of the outer regions of protoplanetary disks in star-forming regions. In particular they prove to be useful for identifying transitional disk candidates.
Aims: The goals of this work are to complement the detections of disks and…
Spatial deconvolution of spectropolarimetric data: an application to quiet Sun magnetic elements
Ruiz Cobo, B.; Quintero Noda, C.; Orozco Suárez, D. +1 more
Context. One of the difficulties in extracting reliable information about the thermodynamical and magnetic properties of solar plasmas from spectropolarimetric observations is the presence of light dispersed inside the instruments, known as stray light.
Aims: We aim to analyze quiet Sun observations after the spatial deconvolution of the data…
Unusual A2142 supercluster with a collapsing core: distribution of light and mass
Park, Changbom; Nevalainen, Jukka; Tempel, Elmo +6 more
Context. Superclusters of galaxies can be used to test cosmological models of the formation and evolution of the largest structures in the cosmic web, and of galaxy and cluster evolution in superclusters.
Aims: We study the distribution, masses, and dynamical properties of galaxy groups in the A2142 supercluster.
Methods: We analyse the …
A distinct magnetic property of the inner penumbral boundary. Formation of a stable umbra-penumbra boundary in a sunspot
Jurčák, J.; Bello González, N.; Schlichenmaier, R. +1 more
Context. A sunspot emanates from a growing pore or protospot. In order to trigger the formation of a penumbra, large inclinations at the outskirts of the protospot are necessary. The penumbra develops and establishes by colonising both umbral areas and granulation. Evidence for a unique stable boundary value for the vertical component of the magne…
A solar tornado observed by EIS. Plasma diagnostics
Fletcher, L.; Schmieder, B.; Labrosse, N. +1 more
Context. The term "solar tornadoes" has been used to describe apparently rotating magnetic structures above the solar limb, as seen in high resolution images and movies from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO). These often form part of the larger magnetic structure of a prominence, however the links b…
New constraints on the dust surrounding HR 4796A
Pinte, C.; Augereau, J. -C.; Mawet, D. +7 more
Context. HR 4796A is surrounded by a well-structured and very bright circumstellar disc shaped like an annulus with many interesting features: very sharp inner and outer edges, brightness asymmetries, centre offset, and suspected distortions in the ring.
Aims: We aim to constrain the properties of the dust surrounding the star HR 4796A, in pa…
Radio continuum properties of luminous infrared galaxies. Identifying the presence of an AGN in the radio
Murphy, E. J.; Armus, L.; Vardoulaki, E. +7 more
Context. Luminous infrared galaxies (LIRGs) are systems enshrouded in dust, which absorbs most of their optical/UV emission and radiates it again in the mid- and far-infrared. Radio observations are largely unaffected by dust obscuration, enabling us to study the central regions of LIRGs in an unbiased manner.
Aims: The main goal of this proj…
Relationship between the column density distribution and evolutionary class of molecular clouds as viewed by ATLASGAL
Henning, Th.; Beuther, H.; Kainulainen, J. +2 more
We present the first study of the relationship between the column density distribution of molecular clouds within nearby Galactic spiral arms and their evolutionary status as measured from their stellar content. We analyze a sample of 195 molecular clouds located at distances below 5.5 kpc, identified from the ATLASGAL 870 µm data. We define…