Search Publications
Discrepancies between CFHTLenS cosmic shear and Planck: new physics or systematic effects?
Verde, Licia; Jimenez, Raul; Kitching, Thomas D. +1 more
There is currently a discrepancy in the measured value of the amplitude of matter clustering, parametrized using σ8, inferred from galaxy weak lensing, and cosmic microwave background (CMB) data, which could be an indication of new physics, such as massive neutrinos or a modification to the gravity law, or baryon feedback. In this paper…
The temporal evolution of exposed water ice-rich areas on the surface of 67P/Churyumov-Gerasimenko: spectral analysis
Mottola, S.; Barucci, M. A.; Kappel, D. +16 more
Water ice-rich patches have been detected on the surface of comet 67P/Churyumov-Gerasimenko by the VIRTIS (Visible InfraRed and Thermal Imaging Spectrometer) hyperspectral imager on board the Rosetta spacecraft, since the orbital insertion in late 2014 August. Among these, three icy patches have been selected, and VIRTIS data are used to analyse t…
67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun
Lamy, P. L.; Fulle, M.; Rodrigo, R. +36 more
GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From 2014 August to 2016 June, Rosetta escorted comet 67P during its journey around the Sun. Here, we focus on …
The Carina Nebula and Gum 31 molecular complex - I. Molecular gas distribution, column densities, and dust temperatures
Elia, Davide; Molinari, Sergio; Burton, Michael +6 more
We report high-resolution observations of the 12CO(1-0) and 13CO(1-0) molecular lines in the Carina Nebula and the Gum 31 region obtained with the 22-m Mopra telescope as part of The Mopra Southern Galactic Plane CO Survey. We cover 8 deg2 from l = 285° to 290°, and from b = -1.5° to +0.5°. The molecular gas column…
The mosaic multiple stellar populations in ω Centauri: the horizontal branch and the main sequence
Di Criscienzo, M.; D'Antona, F.; Tailo, M. +2 more
We interpret the stellar population of ω Centauri by means of a population synthesis analysis, following the most recent observational guidelines for input metallicities, helium and [(C+N+O)/Fe] contents. We deal at the same time with the main sequences, sub-giant and horizontal branch (HB) data. The reproduction of the observed colour-magnitude f…
Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky
Simionescu, A.; Fabian, A. C.; Markevitch, M. +9 more
We present the results of a very deep (500 ks) Chandra observation, along with tailored numerical simulations, of the nearest, best resolved cluster cold front in the sky, which lies 90 kpc (19 arcmin) to the north-west of M 87. The northern part of the front appears the sharpest, with a width smaller than 2.5 kpc (1.5 Coulomb mean free paths; at …
Herschel protocluster survey: a search for dusty star-forming galaxies in protoclusters at z = 2-3
Lehmer, B. D.; Smail, Ian; Alexander, D. M. +15 more
We present a Herschel/Spectral and Photometric Imaging Receiver (SPIRE) survey of three protoclusters at z = 2-3 (2QZCluster, HS1700, SSA22). Based on the SPIRE colours (S350/S250 and S500/S350) of 250 µm sources, we selected high-redshift dusty star-forming galaxies potentially associated with the…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - X. The radial distribution of stellar populations in NGC 2808
Milone, A. P.; Bedin, L. R.; Piotto, G. +4 more
Due to their extreme helium abundance, the multiple stellar populations of the globular cluster NGC 2808 have been widely investigated from a photometric, spectroscopic, and kinematic perspective. The most striking feature of the colour-magnitude diagram of NGC 2808 is the triple main sequence (MS), with the red MS corresponding to a stellar popul…
Extreme star formation events in quasar hosts over 0.5 < z < 4
Wang, L.; Feltre, A.; Hatziminaoglou, E. +7 more
We explore the relationship between active galactic nuclei (AGN) and star formation in a sample of 513 optically luminous type 1 quasars up to redshifts of ∼4 hosting extremely high star formation rates (SFRs). The quasars are selected to be individually detected by the Herschel SPIRE instrument at >3σ at 250 µm, leading to typical SFRs o…
Towards the statistical detection of the warm-hot intergalactic medium in intercluster filaments of the cosmic web
Prochaska, J. Xavier; Tejos, Nicolas; Morris, Simon L. +6 more
Modern analyses of structure formation predict a universe tangled in a `cosmic web' of dark matter and diffuse baryons. These theories further predict that at low z, a significant fraction of the baryons will be shock-heated to T ∼ 105-107 K yielding a warm-hot intergalactic medium (WHIM), but whose actual existence has elude…