Search Publications
The VMC survey. L. Type II Cepheids in the Magellanic Clouds: Period-luminosity relations in the near-infrared bands
Ripepi, V.; Molinaro, R.; Marconi, M. +8 more
Context. Type II Cepheids (T2Cs) are the less frequently used counterparts of classical or type I Cepheids (CCs) which provide the primary calibration of the distance ladder for measuring the Hubble constant in the local Universe. In the era of the "Hubble tension", T2C variables together with the RR Lyrae stars and the tip of the red giant branch…
A systematic study of the ultra-fast outflow responses to luminosity variations in active galactic nuclei
Guainazzi, Matteo; Bianchi, Stefano; Kara, Erin +7 more
Context. Ultra-fast outflows (UFOs) have been revealed in a large number of active galactic nuclei (AGN) in the past two decades. Their extreme velocities and high ionization states make them a promising candidate for AGN feedback on the evolution of the host galaxy. However, their exact underlying driving mechanism is not yet fully understood.
Chemistry across dust and gas gaps in protoplanetary disks. Modelling the co-spatial molecular rings in the HD 100546 disk
van Dishoeck, E. F.; Leemker, M.; Wölfer, L. +2 more
Context. Nearby extended protoplanetary disks are commonly marked by prominent rings in dust emission, possibly carved by forming planets. High-resolution observations show that both the dust and the gas are structured. These molecular structures may be related to radial and azimuthal density variations in the disk and/or the disk chemistry.
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The hydrostatic-to-lensing mass bias from resolved X-ray and optical-IR data
Macías-Pérez, J. F.; Perotto, L.; Pointecouteau, E. +11 more
An accurate reconstruction of galaxy cluster masses is key to use this population of objects as a cosmological probe. In this work we present a study on the hydrostatic-to-lensing mass scaling relation for a sample of 53 clusters whose masses were reconstructed homogeneously in a redshift range between z = 0.05 and 1.07. The M500 mass f…
Unveiling the ice and gas nature of active centaur (2060) Chiron using the James Webb Space Telescope
Villanueva, G. L.; Lunine, J. I.; Stansberry, J. +15 more
Context. (2060) Chiron is a large centaur that has been reported active on multiple occasions at relatively large heliocentric distances, including during aphelion passage. Studies of Chiron's coma during active periods have resulted in the detection of C≡N and CO outgassing. Additionally, Chiron is surrounded by a disk of debris that varies with …
Gaia Focused Product Release: A catalogue of sources around quasars to search for strongly lensed quasars
Prusti, T.; Mazeh, T.; Zucker, S. +398 more
Context. Strongly lensed quasars are fundamental sources for cosmology. The Gaia space mission covers the entire sky with the unprecedented resolution of 0.18″ in the optical, making it an ideal instrument to search for gravitational lenses down to the limiting magnitude of 21. Nevertheless, the previous Gaia Data Releases are known to be incomple…
Exploring the dependence of chemical traits on metallicity. Chemical trends for red giant stars with asteroseismic ages
Casamiquela, L.; Winther, M. L.; Blanco-Cuaresma, S. +5 more
Context. Given the massive spectroscopic surveys and the Gaia mission, the Milky Way has turned into a unique laboratory to be explored using abundance ratios that show a strong dependence on time. Within this framework, the data provided through asteroseismology serve as a valuable complement. Even so, it has been demonstrated that chemical trait…
Multi-year characterisation of the broad-band emission from the intermittent extreme BL Lac 1ES 2344+514
Covino, S.; Antonelli, L. A.; D'Elia, V. +238 more
Aims: The BL Lac 1ES 2344+514 is known for temporary extreme properties characterised by a shift of the synchrotron spectral energy distribution (SED) peak energy νsynch, p above 1 keV. While those extreme states have only been observed during high flux levels thus far, additional multi-year observing campaigns are required to achi…
Reconnaissance ultracool spectra in the Euclid Deep Fields
Martín, E. L.; Lodieu, N.; Zhang, J. -Y.
Context. The Euclid spacecraft has been launched and will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telescope will scan repeatedly throughout its mission. The photometric and spectroscopic standards in the EDFs are important benchmarks, c…
The phase-space distribution of the M 81 satellite system
Müller, Oliver; Heesters, Nick; Lelli, Federico +3 more
The spatial distribution of dwarf galaxies around their host galaxies is a critical test for the standard model of cosmology because it probes the dynamics of dark matter halos and is independent of the internal baryonic processes of galaxies. Comoving planes of satellites have been found around the Milky Way, the Andromeda galaxy, and the nearby …