The GOLF experiment on board SOHO is designed to measure global oscillations of the disk-integrated sunlight with high sensitivity and with long term stability...
On the nature of the extragalactic number counts in the K-band
Context: The galaxy number counts has been traditionally used to test models of galaxy evolution. However, the origin of significant differences in the shape of...
On the nature of transverse coronal waves revealed by wavefront dislocations
Context. Coronal waves are an important aspect of the dynamics of the plasma in the corona. Wavefront dislocations are topological features of most waves in...
On the nature of two low-dot{M} X-ray bursters: 1RXS J170854.4-321857 and 1RXS J171824.2-402934
We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single...
On the origin of dwarf elliptical galaxies: the fundamental plane
Context: Early-type dwarf (dE) galaxies are the most common type of galaxies observed in the Universe. Their study has important cosmological implications...
On the origin of reverse polarity patches found by Hinode in sunspot penumbrae
Context: The topology of penumbral magnetic fields is poorly known. The satellite Hinode has recently revealed penumbral structures of a magnetic polarity that...
On the origin of stars with and without planets. Tc trends and clues to Galactic evolution
We explore a sample of 148 solar-like stars to search for a possible correlation between the slopes of the abundance trends versus condensation temperature...
On the origin of the γ-ray emission from the flaring blazar PKS 1222+216
The flat-spectrum radio quasar PKS 1222+216 (4C+21.35, z = 0.432) was detected in the very high energy γ-ray band by MAGIC during a highly active γ-ray phase...
On the period ratio P1/2P2 in the oscillations of coronal loops
Aims.With strong evidence of fast and slow magnetoacoustic modes arising in the solar atmosphere there is scope for improved determinations of coronal...