Search Publications
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…
Wide Post-common Envelope Binaries from Gaia: Orbit Validation and Formation Models
El-Badry, Kareem; Mazeh, Tsevi; Yamaguchi, Natsuko +3 more
Astrometry from Gaia DR3 has enabled the discovery of a sample of 3000+ binaries containing white dwarfs (WD) and main-sequence (MS) stars in relatively wide orbits, with orbital periods P orb = (100–1000) days. This population was not predicted by binary population synthesis models before Gaia and—if the Gaia orbits are robust—likely r…
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…
Surviving the waves: evidence for a dark matter cusp in the tidally disrupting Small Magellanic Cloud
Massana, Pol; Erkal, Denis; De Leo, Michele +3 more
We use spectroscopic data for
EDGE: The direct link between mass growth history and the extended stellar haloes of the faintest dwarf galaxies
Orkney, Matthew D. A.; Pontzen, Andrew; Noël, Noelia E. D. +9 more
Ultra-faint dwarf galaxies (UFDs) are commonly found in close proximity to the Milky Way and other massive spiral galaxies. As such, their projected stellar ellipticity and extended light distributions are often thought to owe to tidal forces. In this paper, we study the projected stellar ellipticities and faint stellar outskirts of tidally isolat…
High-redshift, Small-scale Tests of Ultralight Axion Dark Matter Using Hubble and Webb Galaxy UV Luminosities
Hložek, Renée; Marsh, David J. E.; Winch, Harrison +1 more
We calculate the abundance of UV-bright galaxies in the presence of ultralight axion (ULA) dark matter (DM), finding that axions suppress their formation with a non-trivial dependence on redshift and luminosity. We set limits on axion DM using UV luminosity function (UVLF) data, excluding a single axion as all the DM for m ax < 10
IPA: Class 0 Protostars Viewed in CO Emission Using JWST
Manoj, P.; Narang, Mayank; Bourke, Tyler L. +24 more
We investigate the bright CO fundamental emission in the central regions of five protostars in their primary mass assembly phase using new observations from JWST's Near-Infrared Spectrograph and Mid-Infrared Instrument. CO line emission images and fluxes are extracted for a forest of ∼150 rovibrational transitions from two vibrational bands, v = 1…
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…
The cosmic dipole in the Quaia sample of quasars: a Bayesian analysis
Lewis, Geraint F.; Mittal, Vasudev; Oayda, Oliver T.
We present a Bayesian analysis of the Quaia sample of 1.3 million quasars as a test of the cosmological principle. This principle postulates that the Universe is homogeneous and isotropic on sufficiently large scales, forming the basis of prevailing cosmological models. However, recent analyses of quasar samples have found a matter dipole inconsis…
Ticking away: The long-term X-ray timing and spectral evolution of eRO-QPE2
Merloni, A.; Ponti, G.; Miniutti, G. +11 more
Quasi-periodic eruptions (QPEs) are repeated X-ray flares from galactic nuclei that recur every few hours to days, depending on the source. Despite some diversity in the recurrence and amplitude of eruptions, their striking regularity has motivated theorists to associate QPEs with orbital systems. Among the known QPE sources, eRO-QPE2 has shown th…