Search Publications
Compton-thick AGN in the NuSTAR Era X: Analysing seven local CT-AGN candidates
Pozzi, F.; Vignali, C.; Gilli, R. +14 more
Context. We present the broad-band X-ray spectral analysis (0.6-50 keV) of seven Compton-thick active galactic nuclei (CT-AGN; line-of-sight (LOS) column density > 1024 cm−2) candidates selected from the Swift-BAT 100 month catalogue using archival NuSTAR data.
Aims: We aim to obtain a complete census of the heavily o…
The Gaia-ESO survey: Placing constraints on the origin of r-process elements
Guiglion, G.; Randich, S.; Bragaglia, A. +19 more
Context. A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the …
INTEGRAL study of MAXI J1535−571, MAXI J1820+070, and MAXI J1348 − 630 outbursts. I. Detection and polarization properties of the high-energy emission
Belloni, T.; Petrucci, P. -O.; Rodriguez, J. +5 more
In black hole X-ray binaries, a nonthermal high-energy component is sometimes detected at energies above 200 keV. The origin of this high-energy component is debated and distinct spectral modelizations can lead to different interpretations. High-energy polarimetry measurements with the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) ena…
A Bayesian estimation of the Milky Way's circular velocity curve using Gaia DR3
Thomas, Guillaume F.; Kipper, Rain; Kolka, Indrek +5 more
Aims: Our goal is to calculate the circular velocity curve of the Milky Way, along with corresponding uncertainties that quantify various sources of systematic uncertainty in a self-consistent manner.
Methods: The observed rotational velocities are described as circular velocities minus the asymmetric drift. The latter is described by th…
3D chemical structure of the diffuse turbulent interstellar medium. II. The origin of CH+: A new solution to an 80-year mystery
Godard, B.; Hennebelle, P.; Pineau des Forêts, G. +2 more
Aims: The high abundances of CH+ in the diffuse interstellar medium (ISM) are a long-standing issue of our understanding of the thermodynamical and chemical states of the gas. We investigate here the formation of CH+ in turbulent and multiphase environments, where the heating of the gas is almost solely driven by the photoelectric …
Raising the observed metallicity floor with a 3D non-LTE analysis of SDSS J102915.14+172927.9
Hansen, T. T.; Amarsi, A. M.; Lind, K. +4 more
Context. The first stars marked the end of the cosmic dark ages, produced the first heavy elements, and set the stage for the formation of the first galaxies. Accurate chemical abundances of ultra metal-poor stars ([Fe/H] < −4) can be used to infer the properties of the first stars and thus the formation mechanism for low-mass second-generation…
Relation between metallicities and spectral energy distributions of Herbig Ae/Be stars. A potential link with planet formation
Montesinos, B.; Mendigutía, I.; Kama, M. +5 more
Context. Most studies devoted to Herbig Ae/Be stars (HAeBes) assume solar metallicity. However, the stellar metallicity, [M/H], is a fundamental parameter that can strongly differ depending on the source and may have important implications for planet formation. It has been proposed that the deficit of refractory elements observed in the surfaces o…
Matter ejections behind the highs and lows of the transitional millisecond pulsar PSR J1023+0038
Covino, S.; D'Avanzo, P.; Campana, S. +23 more
Transitional millisecond pulsars are an emerging class of sources that link low-mass X-ray binaries to millisecond radio pulsars in binary systems. These pulsars alternate between a radio pulsar state and an active low-luminosity X-ray disc state. During the active state, these sources exhibit two distinct emission modes (high and low) that altern…
A compact multi-planet system transiting HIP 29442 (TOI-469) discovered by TESS and ESPRESSO. Radial velocities lead to the detection of transits with low signal-to-noise ratio
Bouchy, F.; Rebolo, R.; Zapatero Osorio, M. R. +52 more
Context. One of the goals of the Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) Guaranteed Time Observations (GTO) consortium is the precise characterisation of a selected sample of planetary systems discovered by TESS. One such target is the K0V star HIP 29442 (TOI-469), already known to host a validate…
The ALMA Frontier Fields Survey. VI. Lensing-corrected 1.1 mm number counts in Abell 2744, MACSJ0416.1-2403, MACSJ1149.5+2223, Abell 370, and Abell S1063
Kneissl, R.; Demarco, R.; Bauer, F. E. +8 more
Context. Probing the faint end of the number counts at millimeter wavelengths is important in order to identify the origin of the extragalactic background light in this regime. Aided by strong gravitational lensing, ALMA observations toward massive galaxy clusters have opened a window to probe this origin, allowing us to resolve sub-milliJansky du…