Search Publications
Chemical abundances and deviations from the solar S/O ratio in the gas-phase interstellar medium of galaxies based on infrared emission lines
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +3 more
Context. The infrared (IR) range is extremely useful in the context of chemical abundance studies of the gas-phase interstellar medium (ISM) due to the large variety of ionic species traced in this regime, the negligible effects from dust attenuation or temperature stratification, and the amount of data that has been and will be released in the co…
Detection of the lowest mass ratio contact binary in the universe: TYC 3801-1529-1
Li, Kai; Chen, Xu; Guo, Di-Fu +7 more
This paper presents the first analysis of the contact binary TYC 3801-1529-1. We observed four sets of multiple bands complete light curves and one set of radial velocity curve of the primary component. Based on a simultaneous investigation of our observed and TESS light curves and the radial velocity curve, we found that TYC 3801-1529-1 is an ext…
TOI-837 b: Characterisation, formation, and evolutionary history of an infant warm Saturn-mass planet
Baratella, M.; Marzari, F.; Sozzetti, A. +15 more
Context. The detection and characterisation of planets younger than ~100 Myr offer the opportunity to get snapshots of systems immediately after their formation, where the main evolutionary processes that sculpt mature planetary systems are still ongoing. Known infant exoplanets are currently scarce, and dedicated surveys are required to increase …
Genuine Retrieval of the AGN Host Stellar Population (GRAHSP)
Nandra, Kirpal; Li, Junyao; Netzer, Hagai +11 more
Context. The assembly and co-evolution of super-massive black holes (SMBHs) and their host galaxy stellar population is one of the key open questions in modern galaxy evolution. Observationally constraining this question is challenging. Important parameters of galaxies, such as the stellar mass (M⋆) and star formation rate (SFR), are in…
Application of hydrostatic local thermodynamic equilibrium atmosphere models to interpretations of supersoft X-ray source spectra
Werner, K.; Doroshenko, V.; Suleimanov, V. F. +1 more
Supersoft X-ray sources (SSSs) are accreting white dwarfs (WDs) with stable or recurrent thermonuclear burning on their surfaces. High-resolution X-ray spectra of such objects are rather complex, often consist of several components, and are difficult to interpret accurately. The main emission source is the hot surface of the WD and the emergent ra…
A comparative high-resolution spectroscopic analysis of in situ and accreted globular clusters
Massari, D.; Bellazzini, M.; Mucciarelli, A. +2 more
Globular clusters (GCs) are extremely intriguing systems that help in reconstructing the assembly of the Milky Way via the characterisation of their chemo-chrono-dynamical properties. In this study, we use high-resolution spectroscopic archival data from UVES and UVES-FLAMES at the VLT to compare the chemistry of GCs dynamically tagged as either G…
Quasars as standard candles: VI. Spectroscopic validation of the cosmological sample
Marconi, Alessandro; Signorini, Matilde; Risaliti, Guido +6 more
A sample of quasars has been recently assembled to investigate the non-linear relation between their monochromatic luminosities at 2500 Å and 2 keV and to exploit quasars as a new class of 'standardized candles'. The use of this technique for cosmological purposes relies on the non-evolution with redshift of the UV-optical spectral properties of q…
CIRCLEZ : Reliable photometric redshifts for active galactic nuclei computed solely using photometry from Legacy Survey Imaging for DESI
Shirley, R.; Salvato, M.; Buchner, J. +25 more
Context. Photometric redshifts for galaxies hosting an accreting supermassive black hole in their center, known as active galactic nuclei (AGNs), are notoriously challenging. At present, they are most optimally computed via spectral energy distribution (SED) fittings, assuming that deep photometry for many wavelengths is available. However, for AG…
ALMA-ALPINE [CII] survey: The sub-kpc morphology of three main sequence galaxy systems at z ∼ 4.5 revealed by ALMA
Pozzi, F.; Béthermin, M.; Giavalisco, M. +25 more
Context. Going from a redshift of 6 down to nearly 4, galaxies grow rapidly from low-mass galaxies towards the more mature types of massive galaxies seen at cosmic noon. Growth via gas accretion and mergers undoubtedly shape this evolution, however, there is considerable uncertainty at present over the contribution of each of these processes to th…
High-resolution ALMA observations of compact discs in the wide-binary system Sz 65 and Sz 66
Ricci, L.; Huang, J.; Benisty, M. +11 more
Context. Substructures in disc density are ubiquitous in the bright extended discs that are observed with high resolution. These substructures are intimately linked to the physical mechanisms driving planet formation and disc evolution. Surveys of star-forming regions find that most discs are in fact compact, less luminous, and do not exhibit thes…