Search Publications
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: single-probe measurements from DR12 galaxy clustering - towards an accurate model
Rubiño-Martín, J. A.; Brownstein, Joel R.; Ho, Shirley +28 more
We analyse the broad-range shape of the monopole and quadrupole correlation functions of the Baryon Oscillation Spectroscopic Survey Data Release 12 (DR12) CMASS and LOWZ galaxy sample to obtain constraints on the Hubble expansion rate H(z), the angular-diameter distance DA(z), the normalized growth rate f(z)σ8(z) and the phy…
The X-ray properties of Be/X-ray pulsars in quiescence
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +2 more
Observations of accreting neutron stars (NSs) with strong magnetic fields can be used not only for studying the accretion flow interaction with the NS magnetospheres, but also for understanding the physical processes inside NSs and for estimating their fundamental parameters. Of particular interest are (I) the interaction of a rotating NS (magneto…
The birth and growth of a solar wind cavity around a comet - Rosetta observations
Behar, E.; Nilsson, H.; Goetz, C. +2 more
The Rosetta mission provided detailed observations of the growth of a cavity in the solar wind around comet 67P/Churyumov-Gerasimenko. As the comet approached the Sun, the plasma of cometary origin grew enough in density and size to present an obstacle to the solar wind. Our results demonstrate how the initial slight perturbations of the solar win…
On the initial binary population for star cluster simulations
Kroupa, Pavel; Belloni, Diogo; Rocha-Pinto, Helio J. +2 more
Colour-magnitude diagrams (CMDs) are powerful tools that might be used to infer stellar properties in globular clusters (GCs), for example, the binary fraction and their mass ratio (q) distribution. In the past few years, observations have revealed that q distributions of GC main-sequence binaries are generally flat, and a distribution characteriz…
Globular clusters with Gaia
Marinoni, S.; Pancino, E.; Bellazzini, M. +1 more
The treatment of crowded fields in Gaia data will only be a reality in a few years from now. In particular, for globular clusters, only the end-of-mission data (public in 2022-2023) will have the necessary full crowding treatment and will reach sufficient quality for the faintest stars. As a consequence, the work on the deblending and decontaminat…
Kinematics of OB-associations in Gaia epoch
Dambis, A. K.; Mel'nik, A. M.
We use stellar proper motions from the Tycho-Gaia Astrometric Solution (TGAS) catalogue to study the kinematics of OB-associations. The TGAS proper motions of OB-associations generally agree well with the Hipparcos proper motions. The parameters of the Galactic rotation curve obtained with TGAS and Hipparcos proper motions agree within the errors.…
The search for multiple populations in Magellanic Cloud clusters - I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121
Dalessandro, E.; Salaris, M.; Larsen, S. +14 more
We started a photometric survey using the WFC3/UVIS instrument onboard the Hubble Space Telescope to search for multiple populations within Magellanic Cloud star clusters at various ages. In this paper, we introduce this survey. As first results of this programme, we also present multiband photometric observations of NGC 121 in different filters t…
A centrally heated dark halo for our Galaxy
Binney, James; Cole, D. R.
We construct a new family of models of our Galaxy in which dark matter and disc stars are both represented by distribution functions that are analytic functions of the action integrals of motion. The potential that is self-consistently generated by the dark matter, stars, and gas is determined, and parameters in the distribution functions are adju…
The black hole binary V404 Cygni: a highly accreting obscured AGN analogue
Motta, S. E.; Sánchez-Fernández, C.; Kuulkers, E. +2 more
Typical black hole binaries in outburst show spectral states and transitions, characterized by a clear connection between the inflow on to the black hole and outflows from its vicinity. The transient stellar mass black hole binary V404 Cyg apparently does not fit in this picture. Its outbursts are characterized by intense flares and intermittent p…
The lensing and temperature imprints of voids on the cosmic microwave background
Cai, Yan-Chuan; Neyrinck, Mark; Mao, Qingqing +3 more
We have searched for the signature of cosmic voids in the cosmic microwave background (CMB), in both the Planck temperature and lensing-convergence maps; voids should give decrements in both. We use ZOBOV voids from the Data Release 12 Sloan Digital Sky Survey CMASS galaxy sample. We base our analysis on N-body simulations, to avoid a posteriori b…