Search Publications
Detailed α abundance trends in the inner Galactic bulge
Schultheis, M.; Ryde, N.; Rich, R. M. +7 more
Context. Until now, heavy interstellar extinction has meant that only a few studies of chemical abundances have been possible in the inner Galactic bulge. However, it is crucial to learn more about this structure in order to better understand the formation and evolution of the centre of the Galaxy and galaxies in general.
Aims: In this paper,…
Simultaneous millimetric and X-ray intraday variability in the radio-quiet AGN MCG+08-11-11
Bianchi, S.; Behar, E.; Petrucci, P. -O. +10 more
Most of the active galactic nuclei (AGN) are radio quiet (RQ) and, differently from radio-loud (RL) AGN, they do not show a signature of large-scale or powerful jets. The physical origin of their radio emission thus remains broadly unclear. The observation of flat and inverted radio spectra at gigahertz frequencies seems to support, however, the p…
26Al gamma rays from the Galaxy with INTEGRAL/SPI
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +2 more
Context. The presence of radioactive 26Al at 1.8 MeV reveals an ongoing process of nucleosynthesis in the Milky Way. Diffuse emission from its decay can be measured with gamma-ray telescopes in space. The intensity, line shape, and spatial distribution of the 26Al emission allow for studies of these nucleosynthesis sources. T…
HARPS radial velocity search for planets in the Scorpius-Centaurus association. A combination with the HARPS and SOPHIE young nearby stars (YNS) surveys
Meunier, N.; Messina, S.; Kiefer, F. +13 more
Context. The Scorpius-Centaurus (Sco-Cen) young and nearby massive star-forming region is particularly well suited for extrasolar planet searches with both direct imaging and radial velocity (RV) techniques. The RV search, however, is challenging, as the stars are faster rotators on average than their older stellar counterparts of similar spectral…
Complete X-ray census of M dwarfs in the solar neighborhood. I. GJ 745 AB: Coronal-hole stars in the 10 pc sample
Güdel, M.; Orlando, S.; Stelzer, B. +4 more
Context. X-ray emission is the most sensitive diagnostic of magnetic activity in M dwarfs and, hence, of the dynamo in low-mass stars. Moreover it is crucial for quantifying the influence of the stellar irradiation on the evolution of planet atmospheres.
Aims: We have embarked in a systematic study of the X-ray emission in a volume-limited sa…
Tracing the Galactic disk with planetary nebulae using Gaia DR3. Distance catalog, velocities, populations, and radial metallicity gradients of Galactic planetary nebulae
Bucciarelli, B.; Stanghellini, L.
Aims: We study the population of Galactic planetary nebulae (PNe) and their central stars (CSPNe) through the analysis of their distances and Galactic distribution. The PN distances are obtained by means of a revised statistical distance scale, based on an astrometrically-defined sample of their central stars from the third Gaia Data Release …
Electron density revealing the boundaries of Mercury's magnetosphere via serendipitous measurements by SORBET during BepiColombo first and second Mercury swing-bys
Pantellini, F.; Issautier, K.; Kasaba, Y. +3 more
Aims: We aim to establish the boundaries of Mercury's magnetosphere through a comparison of the drops and rises of the electron density revealed by PWI/SORBET, during BepiColombo's first and second swing-bys of Mercury carried out on 1 October 2021 and 23 June 2022, with global 3D magnetohydrodynamic simulations.
Methods: SORBET was swit…
The age, kinematics, and metallicity of nearby Sun-like stars and the history of the Milky Way disc
Gondoin, P.
Contact. Investigating how the Milky Way formed and has evolved is an important topic in astrophysics that requires the determination of precise ages for large samples of stars over long periods.
Aims: The present study addresses the formation history of nearby Sun-like stars using the emission reversal in the cores of their Ca II H&K Fra…
An advanced thermal roughness model for airless planetary bodies. Implications for global variations of lunar hydration and mineralogical mapping of Mercury with the MERTIS spectrometer
Hiesinger, Harald; Helbert, Jörn; Wöhler, Christian +1 more
We present a combined reflectance and thermal radiance model for airless planetary bodies. The Hapke model provides the reflected component. The developed thermal model is the first to consistently use rough fractal surfaces, self-scattering, self-heating, and disk-resolved bolometric albedo for entire planets. We validated the model with disk-res…
A LOFAR sample of luminous compact sources coincident with nearby dwarf galaxies
Shimwell, T. W.; Vedantham, H. K.; Kaplan, D. L. +5 more
The vast majority of extragalactic compact continuum radio sources are associated with star formation or jets from (super)massive black holes and, as such, are more likely to be found in association with starburst galaxies or early-type galaxies. Two new populations of radio sources were recently identified: (a) compact and persistent sources (PRS…