Search Publications
Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: the Be-O correlation
Bonifacio, P.; Caffau, E.; Spite, M. +3 more
Context. Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles.
Aims: We investigate the Be abundance in the extremely metal-poor star 2MASS J1808-5104 ([Fe/H] = -3.84) with the aim of constraining inhomogeneities or the presence of late decay…
Nuclear angular momentum of early-type galaxies hosting nuclear star clusters
Lyubenova, Mariya; Tsatsi, Athanassia
Context. Nucleation is a common phenomenon in all types of galaxies and at least 70% of them host nuclear star clusters (NSCs) in their centres. Many of the NSCs co-habit with supermassive black holes and follow similar scaling relations with host galaxy properties. Unlike black holes, NSCs, preserve the signature of their evolutionary path imprin…
Properties of LBGs with [OIII] detection at z ∼ 3.5. The importance of including nebular emission data in SED fitting
Burgarella, Denis; Boquien, Médéric; Yuan, Fang-Ting +3 more
Context. Nebular emission lines are critical to measure physical properties in the ionized gas (e.g., metallicity, the star formation rate, or dust attenuation). They also account for a significant fraction of broadband fluxes, in particular at the highest redshifts, and therefore can strongly affect the determination of other physical properties,…
Exploring the damping of Alfvén waves along a long off-limb coronal loop, up to 1.4 R⊙
Mason, H. E.; Del Zanna, G.; Gupta, G. R.
The Alfvén wave energy flux in the corona can be explored using the electron density and velocity amplitude of the waves. The velocity amplitude of Alfvén waves can be obtained from the non-thermal velocity of spectral line profiles. Previous calculations of the Alfvén wave energy flux with height in active regions and polar coronal holes have pro…
Two years with comet 67P/Churyumov-Gerasimenko: H2O, CO2, and CO as seen by the ROSINA/RTOF instrument of Rosetta
Lasue, J.; Wurz, P.; Altwegg, K. +18 more
Context. The ESA Rosetta mission investigated the environment of comet 67P/Churyumov-Gerasimenko (hereafter 67P) from August 2014 to September 2016. One of the experiments on board the spacecraft, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) included a COmet Pressure Sensor (COPS) and two mass spectrometers to analyze the…
Elemental composition in quiescent prominences
Vial, J. -C.; Parenti, S.; Del Zanna, G.
Context. The first ionization potential (FIP) bias is currently used to trace the propagation of solar features ejected by the wind and solar eruptions (coronal mass ejections). The FIP bias also helps us to understand the formation of prominences, as it is a tracer for the solar origin of prominence plasma.
Aims: This work aims to provide el…
Spectroscopic binaries RV Tauri and DF Cygni
Bowman, Dominic M.; Manick, Rajeev; Van Winckel, Hans +7 more
Context. Some RV Tauri stars show a long-term photometric variability in their mean magnitudes. DF Cygni (DF Cyg), the only RV Tauri star in the original Kepler field, and the prototype RV Tauri (RV Tau) are two such stars.
Aims: The focus of this paper is on two famous but still poorly understood RV Tauri stars: RV Tau and DF Cyg. We aim to …
The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18
Hatzidimitriou, D.; Gilmore, G.; Bayo, A. +34 more
Context. Pismis 18 is a moderately populated, intermediate-age open cluster located within the solar circle at a Galactocentric distance of about seven kpc. Few open clusters have been studied in detail in the inner disc region before the Gaia-ESO Survey.
Aims: New data from the Gaia-ESO Survey allowed us to conduct an extended radial velocit…
MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy
Humphrey, A.; Villar-Martín, M.; De Breuck, C. +9 more
We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z = 2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas. In both Lyα λ1216 and He II λ1640 lines, we observe emission with velocity shifts of Δv ≃ -1000 km s-1 from the systemic redshift of the galaxy. Thes…
Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +34 more
Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The Anhur region in the southern part of the comet's larger lobe was found to be highly eroded, enriched in volatiles, and highly active.
Aims: We analyze high-…