Search Publications
The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel
Massardi, M.; Enia, A. F. M.; Negrello, M. +6 more
We investigate the radio/far-infrared (FIR) correlation for a sample of 28 bright high-redshift (1 ≲ z ≲ 4) star-forming galaxies selected in the FIR from the Herschel-ATLAS fields as candidates to be strongly gravitationally lensed. The radio information comes either from high sensitivity dedicated Australia Telescope Compact Array observations a…
Probing computational methodologies in predicting mid-infrared spectra for large polycyclic aromatic hydrocarbons
Rigopoulou, D.; García-Bernete, I.; Roche, P. F. +3 more
We extend the prediction of vibrational spectra to large sized polycyclic aromatic hydrocarbon (PAH) molecules comprising up to ~1500 carbon atoms by evaluating the efficiency of several computational chemistry methodologies. We employ classical mechanics methods (Amber and Gaff) with improved atomic point charges, semi-empirical (PM3, and density…
Constraining density and metallicity of the Milky Way's hot gas halo from O VII spectra and ram-pressure stripping
Martynenko, Nickolay
Milky Way's (MW) hot gaseous halo extends up to the Galactic virial radius (~200 kpc) and contains a significant component of baryon mass of the Galaxy. The halo properties can be constrained from X-ray spectroscopic observations and from satellite galaxies' ram-pressure stripping studies. Results of the former method crucially depend on the gas m…
Synthetic photometry of OB star clusters with stochastically sampled IMFs: analysis of models and HST observations
Grebel, Eva K.; Charlot, Stephane; Wofford, Aida +13 more
We present a pilot library of synthetic NUV, U, B, V, and I photometry of star clusters with stochastically sampled IMFs and ionized gas for initial masses, Mi = 103, 104, and 105 M⊙; t = 1, 3, 4, and 8 Myr; Z = 0.014 and Z = 0.002; and log(US) = -2 and -3. We compare the library wi…
Low X-ray surface brightness clusters: implications on the scatter of the M-T and L-T relations
Andreon, S.; Moretti, A.; Trinchieri, G.
We aim at studying scaling relations of a small but well-defined sample of galaxy clusters that includes the recently discovered class of objects that are X-ray faint for their mass. These clusters have an average low X-ray surface brightness, a low gas fraction, and are underrepresented (by a factor of 10) in X-ray surveys or entirely absent in S…
Measuring the smearing of the Galactic 511-keV signal: positron propagation or supernova kicks?
Calore, Francesca; Siegert, Thomas; Panther, Fiona H. +4 more
We use 15 years of $\gamma$-ray data from INTEGRAL/SPI in a refined investigation of the morphology of the Galactic bulge positron annihilation signal. Our spatial analysis confirms that the signal traces the old stellar population in the bulge and reveals for the first time that it traces the boxy bulge and nuclear stellar bulge. Using a 3D smoot…
First evidence of a collision between two unrelated open clusters in the Milky Way
Piatti, Andrés E.; Malhan, Khyati
We report the first evidence of an ongoing collision between two star clusters in our Galaxy, namely IC 4665 and Collinder 350. These are open clusters located at a distance of ~330 pc from the Sun and ~100 pc above the Galactic plane, and they both have prograde motions with only a small difference in their velocities (Collinder 350 moves $\sim 5…
Astrometric star-cluster membership probability: application to the case of M 37 with Gaia EDR3
Bedin, L. R.; Griggio, M.
In this work, starting from the well-accepted relations in literature, we introduce a new formalism to compute the astrometric membership probabilities for sources in star clusters, and we provide an application to the case of the open cluster M 37. The novelty of our approach is a refined - and magnitude-dependent - modelling of the parallax dist…
Detection of 7Be II in the Small Magellanic Cloud
Izzo, Luca; Selvelli, Pierluigi; Della Valle, Massimo +8 more
We analyse high-resolution spectra of two classical novae that exploded in the Small Magellanic Cloud (SMC). 7Be II resonance transitions are detected in both ASASSN-19qv and ASASSN-20ni novae. This is the first detection outside the Galaxy and confirms that thermo-nuclear runaway reactions, leading to the 7Be formation, are …
Identifying the population of stable ν6 resonant asteroids using large data bases
Carruba, V.; Aljbaae, S.; Domingos, R. C. +2 more
Large observational surveys, like those that will be conducted at the Vera C. Rubin Observatory, are expected to discover up to one million new asteroids in the first year of operation. This will more than double the data base of known asteroids. New methods will be needed to handle the large influx of data. Here, we tested some of these new appro…