Search Publications
Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: A moderate changing-state AGN?
Done, C.; Grosso, N.; Porquet, D. +4 more
Context. The X-ray broadband spectra of the bare active galactic nucleus (AGN) Mrk 110, obtained by simultaneous XMM-Newton and NuSTAR observations performed in November 2019 and April 2020, are characterised by the presence of a prominent and absorption-free smooth soft X-ray excess, moderately broad O VII and Fe Kα emission lines, and a lack of …
Mid-infrared spectra of T Tauri disks: Modeling the effects of a small inner cavity on CO2 and H2O emission
Tabone, Benoît; van Dishoeck, Ewine F.; Vlasblom, Marissa +1 more
Context. The inner few AU of disks around young stars, where terrestrial planets are thought to form, are best probed in the infrared. The James Webb Space Telescope is now starting to characterize the chemistry of these regions in unprecedented detail, building on earlier results of the Spitzer Space Telescope that the planet-forming zone of disk…
MUSE adaptive-optics spectroscopy confirms dual active galactic nuclei and strongly lensed systems at sub-arcsec separation
Marconi, A.; Vignali, C.; Ginolfi, M. +21 more
The novel Gaia multi peak (GMP) technique has proven to be able to successfully select dual and lensed active galactic nuclei (AGN) candidates at sub-arcsecond separations. Both populations are important because dual AGN represent one of the central, still largely untested, predictions of ΛCDM cosmology, and compact lensed AGN allow us to probe th…
MINDS: Mid-infrared atomic and molecular hydrogen lines in the inner disk around a low-mass star
Henning, Thomas; Waters, L. B. F. M.; Güdel, Manuel +27 more
Context. Understanding the physical conditions of circumstellar material around young stars is crucial to star and planet formation studies. In particular, very low-mass stars (M★ < 0.2 M⊙) are interesting sources to characterize as they are known to host a diverse population of rocky planets. Molecular and atomic hydrogen…
Metallicities for more than 10 million stars derived from Gaia BP/RP spectra
Hansen, T. T.; Xylakis-Dornbusch, T.; Christlieb, N. +3 more
Context. The third Gaia Data Release, which includes BP/RP spectra for 219 million sources, has opened a new window into the exploration of the chemical history and evolution of the Milky Way. The wealth of information encapsulated in these data is far greater than their low resolving power (R ~ 50) would suggest at first glance, as shown in many …
The Galaxy Activity, Torus, and Outflow Survey (GATOS): V. Unveiling PAH survival and resilience in the circumnuclear regions of AGNs with JWST
Rigopoulou, D.; Hönig, S. F.; Gandhi, P. +30 more
This study analyses JWST MIRI/MRS observations of the infrared (IR) polycyclic aromatic hydrocarbon (PAH) bands in the nuclear (∼0.4″ at 11 µm; ∼75 pc) and circumnuclear regions (inner ∼kpc) of local active galactic nuclei (AGNs) from the Galactic Activity, Torus, and Outflow Survey (GATOS). We examine the PAH properties in the circumnuclear…
The Prince and the Pauper: Evidence for the early high-redshift formation of the Galactic α-poor disc population
Laporte, Chervin F. P.; Buck, Tobias; Serenelli, Aldo +5 more
Context. The presence of [α/Fe]-[Fe/H] bi-modality in the Milky Way disc has intrigued the Galactic archaeology community over more than two decades.
Aims: Our goal is to investigate the chemical, temporal, and kinematical structure of the Galactic discs using abundances, kinematics, and ages derived self-consistently with the new Bayesian fr…
The ALMA-CRISTAL survey: Dust temperature and physical conditions of the interstellar medium in a typical galaxy at z = 5.66
Förster Schreiber, N. M.; Bowler, R. A. A.; De Looze, I. +25 more
We present new λrest = 77 µm dust continuum observations from the Atacama Large Millimeter/submillimeter Array of HZ10 (CRISTAL-22). This dusty main sequence galaxy at z = 5.66 was observed as part of the [CII] Resolved Ism in STar-forming Alma Large program (CRISTAL). The high angular resolution of the ALMA Band 7 and new Band 9 …
MINCE. II. Neutron capture elements
Steffen, M.; Hansen, C. J.; Bonifacio, P. +24 more
Context. Most of the studies on the determination of the chemical composition of metal-poor stars have been focused on the search of the most pristine stars, searching for the imprints of the ejecta of the first supernovae. Apart from the rare and very interesting r-enriched stars, few elements are measurable in the very metal-poor stars. On the o…
Age uncertainties of red giants due to cumulative rotational mixing of progenitors calibrated by asteroseismology
Aerts, C.; Van Reeth, T.; Fritzewski, D. J. +2 more
Context. Galactic archaeology largely relies on precise ages of distant evolved stars in the Milky Way. Nowadays, asteroseismology can deliver ages for many red giants observed with high-cadence, high-precision photometric space missions such as CoRoT, Kepler, K2, TESS, and soon PLATO.
Aims: Our aim is to quantify the age uncertainties of cur…