Search Publications
APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
Piatti, Andrés E.; Beers, Timothy C.; Placco, Vinicius M. +26 more
The central (`bulge') region of the Milky Way is teeming with a significant fraction of mildly metal-deficient stars with atmospheres that are strongly enriched in cyanogen (12C14N). Some of these objects, which are also known as nitrogen-enhanced stars, are hypothesised to be relics of the ancient assembly history of the Mil…
The first simultaneous X-ray broadband view of Mrk 110 with XMM-Newton and NuSTAR
Grosso, N.; Porquet, D.; Reeves, J. N. +2 more
Context. Soft and hard X-ray excesses, compared to the continuum power-law shape between ∼2−10 keV, are common features observed in the spectra of active galactic nuclei (AGN) and are associated with the accretion disc-corona system around the supermassive black hole. However, the dominant process at work is still highly debated and has been propo…
Solar Orbiter's first Venus flyby: Observations from the Radio and Plasma Wave instrument
Maksimovic, M.; Bale, S. D.; Chust, T. +41 more
Context. On December 27, 2020, Solar Orbiter completed its first gravity assist manoeuvre of Venus (VGAM1). While this flyby was performed to provide the spacecraft with sufficient velocity to get closer to the Sun and observe its poles from progressively higher inclinations, the Radio and Plasma Wave (RPW) consortium, along with other operational…
Recovery and analysis of rest-frame UV emission lines in 2052 galaxies observed with MUSE at 1.5 < z < 6.4
Feltre, A.; Kollatschny, W.; Mahler, G. +17 more
Rest-frame ultraviolet (UV) emission lines probe electron densities, gas-phase abundances, metallicities, and ionization parameters of the emitting star-forming galaxies and their environments. The strongest main UV emission line, Lyα, has been instrumental in advancing the general knowledge of galaxy formation in the early universe. However, obse…
SUPER. V. ALMA continuum observations of z ∼ 2 AGN and the elusive evidence of outflows influencing star formation
Alexander, D. M.; Fiore, F.; Marconi, A. +24 more
We study the impact of active galactic nuclei (AGN) ionised outflows on star formation in high-redshift AGN host galaxies, by combining near-infrared integral field spectroscopic (IFS) observations, mapping the Hα emission and [O III]λ5007 outflows, with matched-resolution observations of the rest-frame far-infrared (FIR) emission. We present high…
Forbidden hugs in pandemic times. II. The luminous red nova variety: AT 2020hat and AT 2020kog
Lundqvist, P.; Reichart, D. E.; Rest, A. +32 more
We present the results of our monitoring campaigns of the luminous red novae (LRNe) AT 2020hat in NGC 5068 and AT 2020kog in NGC 6106. The two objects were imaged (and detected) before their discovery by routine survey operations. They show a general trend of slow luminosity rise, lasting at least a few months. The subsequent major LRN outbursts w…
Deciphering the evolution of the Milky Way discs: Gaia APOGEE Kepler giant stars and the Besançon Galaxy Model
Anders, F.; Chiappini, C.; Figueras, F. +13 more
Context. Thanks to ongoing efforts to compute accurate stellar ages, we are able to characterise stars in different regions of the Milky Way. The Gaia and Kepler space-missions, along with ground-based spectroscopic surveys such as APOGEE, provide a unique way to study the chemo-kinematics relations as a function of age through the Galactic stella…
Identification of pre-stellar cores in high-mass star forming clumps via H2D+ observations with ALMA
Wyrowski, F.; Caselli, P.; Giannetti, A. +5 more
Context. The different theoretical models concerning the formation of high-mass stars make distinct predictions regarding their progenitors, which are the high-mass pre-stellar cores. However, no conclusive observation of such objects has been made to date.
Aims: We aim to study the very early stages of high-mass star formation in two infrare…
The properties of dwarf spheroidal galaxies in the Cen A group. Stellar populations, internal dynamics, and a heart-shaped Hα ring
Coccato, Lodovico; Fahrion, Katja; Müller, Oliver +7 more
Dwarf spheroidal galaxies (dSphs) have been extensively investigated in the Local Group, but their low luminosity and surface brightness make similar work in more distant galaxy groups challenging. Modern instrumentation unlocks the possibility of scrutinizing these faint systems in other environments, expanding the parameter space of group proper…
ALMA 870 µm continuum observations of HD 100546. Evidence of a giant planet on a wide orbit
Lodato, G.; Fedele, D.; Maud, L. +1 more
This paper reports on a new analysis of archival ALMA 870 µm dust continuum observations. Along with the previously observed bright inner ring (r ~ 20-40 au), two addition substructures are evident in the new continuum image: a wide dust gap, r ~ 40-150 au, and a faint outer ring ranging from r ~ 150 au to r ~ 250 au and whose presence was f…