Swirling around filaments: are large-scale structure vortices spinning up dark halos?

The kinematic analysis of dark matter and hydrodynamical simulations suggests that the vorticity in large-scale structure is mostly confined to, and predominantly aligned with their filaments, with an excess of probability of 20 per cent to have the angle between vorticity and filaments direction lower than 60 degrees relative to random orientations. The cross sections of these filaments are typically partitioned into four quadrants with opposite vorticity sign, arising from multiple flows, originating from neighbouring walls. The spins of halos embedded within these filaments are consistently aligned with this vorticity for any halo mass, with a stronger alignment for the most massive structures up to an excess of probability of 165 per cent. On large scales, adiabatic/cooling hydrodynamical simulations display the same vorticity in the gas as in the dark matter. The global geometry of the flow within the cosmic web is therefore qualitatively consistent with a spin acquisition for smaller halos induced by this large-scale coherence, as argued in Codis et al. (2012). In effect, secondary anisotropic infall (originating from the vortex-rich filament within which these lower-mass halos form) dominates the angular momentum budget of these halos. The transition mass from alignment to orthogonality is related to the size of a given multi-flow region with a given polarity. This transition may be reconciled with the standard tidal torque theory if the latter is augmented so as to account for the larger scale anisotropic environment of walls and filaments.Comment: 17 pages, 19 figures, 3 tables. accepted for publication in MNRA

Ocular trauma in the Finnish elderly - Helsinki Ocular Trauma Study

Purpose To describe epidemiology, causes, treatments and outcomes of all ocular injuries in southern Finland among people aged 61 and older. MethodsResultsAll new ocular trauma patients, admitted to the Helsinki University Eye Hospital, during 1year in 2011-2012. The data were from hospital records and prospectively from patient questionnaires. The follow-up time was 3months. The incidence for ocular injuries among the elderly was 38/100000/year. From 118 patients 69% were men. The mean age was 70.9years old (median 67). The hospitalization rate was 14%. Injury types were minor traumas (48%), contusions (22%), chemical injuries (10%), eyelid wounds (8%), open globe injuries (OGI; 7%) and orbital fractures (5%). The injuries occurred at home (58%), institutions (12%) and in other public places (12%). The main causes of ocular injury were falls (22%), sticks (19%), superficial foreign bodies (18%) and chemicals (12%). All OGI and 88% of contusions needed a lifelong follow-up. A permanent visual or functional impairment occurred in 15 (13%) patients. Of these 53% were OGI, 40% contusions and 7% chemical injuries. The causes of permanent injuries were falls (seven cases, 47%), work tools, sports equipment, sticks, chemicals and eyeglasses. The incidence for legal blindness was 2.3/100000. ConclusionMinor trauma was the most frequent type, and home was the location of the most occurred eye injuries. Falls were the most frequent and serious cause, but behavioural causes were not significant. Preventive measures should be directed towards the main identified causes and risk factors of the eye injuries in the elderly.Peer reviewe

Dancing in the dark: galactic properties trace spin swings along the cosmic web

A large-scale hydrodynamical cosmological simulation, Horizon-AGN, is used to investigate the alignment between the spin of galaxies and the cosmic filaments above redshift 1.2. The analysis of more than 150000 galaxies per time step in the redshift range 1.2 < z < 1.8 with morphological diversity shows that the spin of low-mass blue galaxies is preferentially aligned with their neighbouring filaments, while high-mass red galaxies tend to have a perpendicular spin. The reorientation of the spin of massive galaxies is provided by galaxy mergers, which are significant in their mass build-up. We find that the stellar mass transition from alignment to misalignment happens around 3 × 1010 M⊙. Galaxies form in the vorticity-rich neighbourhood of filaments, and migrate towards the nodes of the cosmic web as they convert their orbital angular momentum into spin. The signature of this process can be traced to the properties of galaxies, as measured relative to the cosmic web. We argue that a strong source of feedback such as active galactic nuclei is mandatory to quench in situ star formation in massive galaxies and promote various morphologies. It allows mergers to play their key role by reducing post-merger gas inflows and, therefore, keeping spins misaligned with cosmic filament

Planck pre-launch status : The Planck mission

Peer reviewe

John Lane Idol, Jr. — A Thomas Wolfe Companion

Rouberol Jean. John Lane Idol, Jr. — A Thomas Wolfe Companion. In: Revue Française d'Etudes Américaines, N°38, novembre 1988. L'indianité : contextes et perspectives. p. 404

De Falkner à Faulkner : La rose blanche de Memphis

Rouberol Jean. De Falkner à Faulkner : La rose blanche de Memphis. In: Caliban, n°26, 1989. Le Sud avant Faulkner. pp. 105-110

Michel Gresset and Patrick Samway, S.J., eds. — Faulkner and Idealism: Perspectives from Paris

Rouberol Jean. Michel Gresset and Patrick Samway, S.J., eds. — Faulkner and Idealism: Perspectives from Paris. In: Revue Française d'Etudes Américaines, N°23, février 1985. Aspects du Sud aujourd'hui. p. 134

L'immigration européenne aux Etats-Unis (1880-1910), textes recueillis par Jean Cazemajou

Rouberol Jean. L'immigration européenne aux Etats-Unis (1880-1910), textes recueillis par Jean Cazemajou. In: Revue Française d'Etudes Américaines, N°33, juillet 1987. Visions des Etats-Unis. p. 459

Jean Beauté, Un grand juriste anglais, Sir Edward Coke (1552-1634): ses idées politiques et constitutionnelles, préface de Jean-Jacques Chevallier

Rouberol Monique. Jean Beauté, Un grand juriste anglais, Sir Edward Coke (1552-1634): ses idées politiques et constitutionnelles, préface de Jean-Jacques Chevallier. In: XVII-XVIII. Bulletin de la société d'études anglo-américaines des XVIIe et XVIIIe siècles. N°2, 1976. p. 43

Shakespeare and Southern Writers: A Study in Influence ; edited by Philip C. Kolin

Rouberol Jean. Shakespeare and Southern Writers: A Study in Influence ; edited by Philip C. Kolin. In: Revue Française d'Etudes Américaines, N°38, novembre 1988. L'indianité : contextes et perspectives. p. 404