Search Publications
Multiwavelength investigation of the candidate Galactic PeVatron MGRO J1908+06
Mereghetti, S.; Sidoli, L.; La Palombara, N. +3 more
The candidate PeVatron MGRO J1908+06, which shows a hard spectrum beyond 100 TeV, is one of the most peculiar γ-ray sources in the Galactic plane. Its complex morphology and some possible counterparts spatially related with the very high energy (VHE) emission region, preclude to distinguish between a hadronic and leptonic nature of the γ-ray emiss…
Solar wind temperature-velocity relationship over the last five solar cycles and Forbush decreases associated with different types of interplanetary disturbance
Melkumyan, A. A.; Belov, A. V.; Abunina, M. A. +4 more
The behaviour of the solar wind (SW) proton temperature and velocity and their relationship during Forbush decreases (FDs) associated with various types of solar source - coronal mass ejections (CMEs) and coronal holes (CHs) - have been studied. Analysis of cosmic ray variations, SW temperature, velocity, density, plasma beta, and magnetic field (…
Confirmation of ξ1 CMa's ultra-slow rotation: magnetic polarity reversal and a dramatic change in magnetospheric UV emission lines
Wade, G. A.; Fullerton, A. W.; Shultz, M. E. +5 more
The magnetic β Cep pulsator ξ1 CMa has the longest rotational period of any known magnetic B-type star. It is also the only magnetic B-type star with magnetospheric emission that is known to be modulated by both rotation and pulsation. We report here the first unambiguous detection of a negative longitudinal magnetic field in ξ1
TOI-220 b: a warm sub-Neptune discovered by TESS
Bouchy, F.; Deeg, H.; Deleuil, M. +77 more
In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary m…
Comparing hypervelocity star populations from the Large Magellanic Cloud and the Milky Way
Rossi, E. M.; Marchetti, T.; Evans, F. A. +2 more
We predict and compare the distributions and properties of hypervelocity stars (HVSs) ejected from the centres of the Milky Way (MW) and the Large Magellanic Cloud (LMC). In our model, HVSs are ejected at a constant rate - equal in both galaxies - via the Hills mechanism and are propagated in a combined potential, where the LMC orbits the MW on it…
Detecting globular cluster tidal extensions with Bayesian inference - I. Analysis of ω Centauri with Gaia EDR3
Ferguson, A. M. N.; Peñarrubia, J.; Kuzma, P. B.
The peripheral regions of globular clusters (GCs) are extremely challenging to study due to their low surface brightness nature and the dominance of Milky Way contaminant populations along their sightlines. We have developed a probabilistic approach to this problem through utilizing a mixture model in spatial and proper motion space that separatel…
Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
Charlton, Jane C.; Kacprzak, Glenn G.; Nanayakkara, Themiya +5 more
The relationship between a galaxy's properties and its circumgalactic medium (CGM) provides a unique view of how galaxies evolve. We present an interesting edge-on (i = 86°) disc galaxy (G1547) where the CGM is probed by a background quasar at a distance of 84 kpc and within 10° of the galaxy major axis. G1547 does not have any detectable CGM abso…
Giant molecular cloud formation at the interface of colliding supershells in the large magellanic cloud
Inoue, Tsuyoshi; Kawamura, Akiko; Fukui, Yasuo +8 more
We investigate the H I envelope of the young, massive GMCs in the star-forming regions N48 and N49, which are located within the high column density H I ridge between two kpc-scale supergiant shells, LMC 4 and LMC 5. New long-baseline H I 21 cm line observations with the Australia Telescope Compact Array (ATCA) were combined with archival shorter …
AzTEC survey of the central molecular zone: increasing spectral index of dust with density
Wang, Q. Daniel; Wilson, Grant W.; Tang, Yuping
The central molecular zone (CMZ) of our Galaxy hosts an extreme environment analogous to that found in typical starburst galaxies in the distant Universe. In order to understand dust properties in environments like our CMZ, we present results from a joint spectral energy distribution analysis of our AzTEC/Large Millimeter Telescope survey, togethe…
Stellar feedback in a clumpy galaxy at z 3.4
Le Floc'h, E.; Rodighiero, G.; Zanella, A. +18 more
Giant star-forming regions (clumps) are widespread features of galaxies at z ≈ 1-4. Theory predicts that they can play a crucial role in galaxy evolution, if they survive to stellar feedback for >50 Myr. Numerical simulations show that clumps' survival depends on the stellar feedback recipes that are adopted. Up to date, observational constrain…