Search Publications
AGNs in massive galaxy clusters: Role of galaxy merging, infalling groups, cluster mass, and dynamical state
Koulouridis, E.; Drigga, E.; Gkini, A.
Context. There is compelling evidence that active galactic nuclei (AGNs) in high-density regions have undergone a different evolution than their counterparts in the field, indicating that they are strongly affected by their environment. However, we still lack a comprehensive understanding of the dominant mechanisms that trigger the nucleus and the…
Anatomy of an ionized bubble: NIRCam grism spectroscopy of the z = 6.6 double-peaked Lyman-α emitter COLA1 and its environment
Conroy, Charlie; Sobral, David; Tacchella, Sandro +10 more
The increasingly neutral intergalactic gas at z > 6 impacts the Lyman-α (Lyα) flux observed from galaxies. One luminous galaxy, COLA1, stands out because of its unique double-peaked Lyα line at z = 6.6, unseen in any simulation of reionization. Here, we present JWST/NIRCam wide-field slitless spectroscopy in a 21 arcmin2 field center…
Hunting for complex cyanides in protostellar ices with the JWST. A tentative detection of CH3CN and C2H5CN
Manoj, P.; van Dishoeck, E. F.; Nazari, P. +20 more
Nitrogen-bearing complex organic molecules have been commonly detected in the gas phase but not yet in interstellar ices. This has led to the long-standing question of whether these molecules form in the gas phase or in ices. The James Webb Space Telescope (JWST) offers the sensitivity, spectral resolution, and wavelength coverage needed to detect…
Metal-poor stars with disc-like orbits. Possible traces of the Galactic disc at very early epochs
Massari, D.; De Angeli, F.; Riello, M. +5 more
We used photometric metallicity estimates for about 700 000 stars in the surroundings of the Sun, with very accurate distances and 3D motions measures from Gaia DR3, to explore the properties of the metal-poor (−2.0 < [Fe/H] ≤ −1.5; MP) and very metal-poor ([Fe/H] ≤ −2.0; VMP) stars with disc kinematics in the sample. We confirm the presence of…
Binarity at LOw Metallicity (BLOeM): A spectroscopic VLT monitoring survey of massive stars in the SMC
van Loon, J. Th.; Wang, C.; Crowther, P. A. +75 more
Surveys in the Milky Way and Large Magellanic Cloud have revealed that the majority of massive stars will interact with companions during their lives. However, knowledge of the binary properties of massive stars at low metallicity, and therefore in conditions approaching those of the Early Universe, remain sparse. We present the Binarity at LOw Me…
The ALMA-CRISTAL survey: Discovery of a 15 kpc-long gas plume in a z = 4.54 Lyman-α blob
Lutz, D.; Förster Schreiber, N. M.; Veilleux, S. +25 more
Massive star-forming galaxies in the high-redshift universe host large reservoirs of cold gas in their circumgalactic medium (CGM). Traditionally, these reservoirs have been linked to diffuse H I Lyman-α (Lyα) emission extending beyond ≈10 kpc scales. In recent years, millimeter and submillimeter observations have started to identify even colder g…
TIPSY: Trajectory of Infalling Particles in Streamers around Young stars. Dynamical analysis of the streamers around S CrA and HL Tau
Yen, Hsi-Wei; Williams, Jonathan P.; Birnstiel, Til +3 more
Context. Elongated trails of infalling gas, often referred to as "streamers," have recently been observed around young stellar objects (YSOs) at different evolutionary stages. This asymmetric infall of material can significantly alter star and planet formation processes, especially in the more evolved YSOs.
Aims: In order to ascertain the inf…
The NIRSpec Wide GTO Survey
Maseda, Michael V.; Parlanti, Eleonora; Carniani, Stefano +20 more
The Near-infrared Spectrograph (NIRSpec) on the James Webb Space Telescope is uniquely suited to studying galaxies in the distant Universe with its combination of multi-object capabilities and sensitivity over a large range in wavelength (0.6 ‑ 5.3 µm). Here we present the NIRSpec Wide survey, part of the NIRSpec Instrument Science Team's Gu…
Cepheid Metallicity in the Leavitt Law (C- MetaLL) survey. IV. The metallicity dependence of Cepheid period-luminosity relations
Clementini, G.; Ripepi, V.; Molinaro, R. +10 more
Context. Classical Cepheids (DCEPs) play a fundamental role in the calibration of the extragalactic distance ladder, which eventually leads to the determination of the Hubble constant (H0) thanks to the period-luminosity (PL) and period-Wesenheit (PW) relations exhibited by these pulsating variables. Therefore, it is of great importance…
Imaging detection of the inner dust belt and the four exoplanets in the HR 8799 system with JWST's MIRI coronagraph
Henning, Thomas; Güdel, Manuel; Colina, Luis +35 more
Context. The MIRI instrument on board JWST is now offering high-contrast imaging capacity at mid-IR wavelengths, thereby opening a completely new field of investigation for characterizing young exoplanetary systems.
Aims: The multiplanet system HR 8799 is the first target observed with MIRI's coronagraph as part of the MIRI-EC Guaranteed Time…