Search Publications
Joint HST, VLT/MUSE, and XMM-Newton observations to constrain the mass distribution of the two strong lensing galaxy clusters: MACS J0242.5-2132 and MACS J0949.8+1708
Lewis, Geraint F.; Mahler, Guillaume; Lagattuta, David J. +6 more
We present the strong lensing analysis of two galaxy clusters: MACS J0242.5-2132 (MACS J0242, z = 0.313) and MACS J0949.8+1708 (MACS J0949, z = 0.383). Their total matter distributions are constrained, thanks to the powerful combination of observations with the Hubble Space Telescope (HST) and the Multi-Unit Spectroscopic Explorer instrument. Usin…
Polycyclic aromatic hydrocarbon size tracers
Boersma, C.; Peeters, E.; Maragkoudakis, A. +1 more
We examine the dependence of polycyclic aromatic hydrocarbon (PAH) band intensity ratios as a function of the average number of carbon atoms and assess their effectiveness as tracers for PAH size, utilizing the data, models, and tools provided by the NASA Ames PAH Infrared Spectroscopic Data base. To achieve this, we used spectra from mixtures of …
High-energy particle enhancements in the solar wind upstream Mercury during the first BepiColombo flyby: SERENA/PICAM and MPO-MAG observations
Kallio, E.; Barabash, S.; Livi, S. +27 more
Context. The first BepiColombo Mercury flyby offered the unique opportunity to simultaneously characterize the plasma and the magnetic field properties of the solar wind in the vicinity of the innermost planet of the Solar System (0.4 AU).
Aims: In this study, we use plasma observations by SERENA/PICAM and magnetic field measurements by MPO-M…
A Bayesian chemical evolution model of the DustPedia galaxy M74
Meneghetti, Massimo; Pozzi, Francesca; Calura, Francesco +8 more
We introduce a new, multizone chemical evolution model of the DustPedia galaxy M74, calibrated by means of Markov Chain Monte Carlo methods. We take into account the observed stellar and gas density profiles and use Bayesian analysis to constrain two fundamental parameters characterizing the gas accretion and star formation time-scale, i.e. the in…
A sub-Neptune transiting the young field star HD 18599 at 40 pc
Tamura, M.; Liu, H.; Zhang, H. +66 more
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599 , a young (300 Myr), nearby (d = 40…
HD 42477: coupled r modes, g modes, and a p mode in an A0Vnne star
Handler, G.; Lee, U.; Saio, H. +4 more
Several studies have shown that a number of stars pulsating in p modes lie between the β Cep and δ Sct instability strips in the Hertzsprung-Russell (HR) Diagram. At present, there is no certain understanding of how p modes can be excited in this Teff range. The goal of this work is to disprove the conjecture that all stars pulsating in…
On the phenomenology of magnetosheath jets with insight from theory, modelling, numerical simulations and observations by Cluster spacecraft
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +5 more
During recent years magnetosheath plasma structures called "jets" are identified in spacecraft data as localized regions in the magnetosheath where the dynamic pressure is enhanced compared to the background. Although the nomenclature and detection algorithms vary from author to author, magnetosheath jets are part of a larger class of phenomena wh…
Discovery of periodicities in two highly variable intermediate polars towards the Galactic centre
Mori, Kaya; Morris, Mark R.; Rea, Nanda +5 more
Aims: We performed a systematic analysis of X-ray point sources within 1.°5 of the Galactic centre using archival XMM-Newton data. While doing so, we discovered Fe Kα complex emission and pulsation in two highly variable sources, 4XMM J174917.7-283329 and 4XMM J174954.6-294336. In this work we report the findings of the …
Rotation and activity in late-type members of the young cluster ASCC 123
Bragaglia, A.; Frasca, A.; Alonso-Santiago, J. +1 more
ASCC 123 is a little-studied young and dispersed open cluster. Recently, we conducted the first research devoted to it. In this paper, we complement our previous work with Transiting Exoplanet Survey Satellite (TESS) photometry for the 55 likely members of the cluster. We pay special attention to seven of these high-probability members, all with F…
The largest bright ULX population in a galaxy: X-ray variability and luminosity function in the Cartwheel ring galaxy
Wolter, A.; Belfiore, A.; Salvaggio, Chiara +1 more
We analyse all the available Chandra observations of the Cartwheel galaxy and its compact group, taken between 2001 and 2008, with the main aim of addressing the variability in the X-ray band for this spectacular collisional ring galaxy. We focus on the study of point-like sources, in particular we are interested in ultraluminous X-ray sources (UL…