Search Publications
Transit probabilities in secularly evolving planetary systems
Triaud, Amaury H. M. J.; Wyatt, Mark C.; Read, Matthew J.
This paper considers whether the population of known transiting exoplanets provides evidence for additional outer planets on inclined orbits, due to the perturbing effect of such planets on the orbits of inner planets. As such, we develop a semi-analytical method for calculating the probability that two mutually inclined planets are observed to tr…
The properties, origin and evolution of stellar clusters in galaxy simulations and observations
Dale, D. A.; Calzetti, D.; Smith, L. J. +16 more
We investigate the properties and evolution of star particles in two simulations of isolated spiral galaxies, and two galaxies from cosmological simulations. Unlike previous numerical work, where typically each star particle represents one `cluster', for the isolated galaxies we are able to model features we term `clusters' with groups of particle…
Predicting emission line fluxes and number counts of distant galaxies for cosmological surveys
Cimatti, A.; Daddi, E.; Rodighiero, G. +9 more
We estimate the number counts of line emitters at high redshift and their evolution with cosmic time based on a combination of photometry and spectroscopy. We predict the H α, H β, [O II], and [O III] line fluxes for more than 35 000 galaxies down to stellar masses of ∼109 M⊙ in the COSMOS and GOODS-S fields, applying standar…
Separating galaxies from the cluster dark matter halo in Abell 611
Zitrin, A.; Koekemoer, A.; Postman, M. +7 more
We investigate the mass content of galaxies in the core of the galaxy cluster Abell 611. We perform a strong lensing analysis of the cluster core and use velocity dispersion measurements for individual cluster members as additional constraints. Despite the small number of multiply-imaged systems and cluster members with central velocity dispersion…
Structured star formation in the Magellanic inter-Cloud region
Da Costa, G. S.; Belokurov, V.; Koposov, S. E. +5 more
We use a new contiguous imaging survey conducted using the Dark Energy Camera to investigate the distribution and properties of young stellar populations in the Magellanic inter-Cloud region. These young stars are strongly spatially clustered, forming a narrow chain of low-mass associations that trace the densest H I gas in the Magellanic Bridge a…
A multiwavelength investigation of candidate millisecond pulsars in unassociated γ-ray sources
Greiner, J.; Belfiore, A.; Marelli, M. +7 more
About one-third of the 3033 γ-ray sources in the Third Fermi-LAT Gamma-ray Source Catalogue (3FGL) are unidentified and do not have even a tentative association with a known object; hence, they are defined as unassociated. Among Galactic γ-ray sources, pulsars represent the largest class, with over 200 identifications to date. About one-third of t…
MOCCA-SURVEY Database I: Is NGC 6535 a dark star cluster harbouring an IMBH?
Kamann, Sebastian; Bianchini, Paolo; Askar, Abbas +3 more
We describe the dynamical evolution of a unique type of dark star cluster model in which the majority of the cluster mass at Hubble time is dominated by an intermediate-mass black hole (IMBH). We analysed results from about 2000 star cluster models (Survey Database I) simulated using the Monte Carlo code MOnte Carlo Cluster simulAtor and identifie…
First observations of W Virginis stars with K2: detection of period doubling
Smolec, R.; Szabados, L.; Pál, A. +5 more
We present the first analysis of W Vir stars observed by the Kepler space telescope in the K2 mission. Clear cycle-to-cycle variations were detected in the light curves of KT Sco and the globular cluster member M80-V1. While the variations in the former star seem to be irregular on the short time-scale of the K2 data, the latter appears to experie…
Nuclear absorption and emission in the AGN merger NGC 6240 : the hard X-ray view
Nardini, Emanuele
We present the analysis of four NuSTAR observations of the luminous infrared galaxy merger NGC 6240 , hosting a close pair of highly obscured active galactic nuclei (AGNs). Over a period of about 2 yr, the source exhibits hard X-ray variability of the order of 20 per cent, peaking around 20 keV. When the two AGNs are resolved with Chandra , column…
The effect of stellar and AGN feedback on the low-redshift Lyman α forest in the Sherwood simulation suite
Viel, Matteo; Sijacki, Debora; Kim, Tae-Sun +4 more
We study the effect of different feedback prescriptions on the properties of the low-redshift (z ≤ 1.6) Lyα forest using a selection of hydrodynamical simulations drawn from the Sherwood simulation suite. The simulations incorporate stellar feedback, active galactic nuclei (AGN) feedback and a simplified scheme for efficiently modelling the low co…