Modeling of the multiwavelength emission of M87 with H.E.S.S. observations

M87 is the first extragalactic source detected in the TeV range that is not a blazar. The large scale jet of M87 is not aligned with the line of sight. Modification of standard emission models of TeV blazars appears necessary to account for the gamma-ray observations made by H.E.S.S. despite this misalignment. We present a new multi-blob synchrotron self-Compton model that deals explicitly with large viewing angles and moderate values of the Lorentz factor inferred from MHD simulations of jet formation.Comment: 4 pages, 4 figures; to appear in "SF2A 2007 proceedings", eds. J. Bouvier, A. Chalabaev and C. Charbonne

Nicolas Bouvier ou la réinvention du voyage en Orient au XXe siècle

International audience"Nicolas Bouvier, mort à Genève, sa ville natale, en 1998, fit entre 1953 et 1956 un immense périple à travers l'Asie. Parti dans une petite Fiat avec son ami le peintre Thierry Vernet, il traversa la Serbie, la Macédoine, la Turquie, l'Iran, pour aboutir – provisoirement – en Afghanistan. C'est l'itinéraire raconté dans L'Usage du monde, son premier ouvrage, paru en 1963, et considéré comme un chef-d'œuvre de la littérature de voyage du XXe siècle. Le Poisson-Scorpion, qui narre la suite du même voyage, c'est-à-dire un séjour à Ceylan (aujourd'hui Sri Lanka), ne sera publié qu'en 1981. Ce sont ces deux récits qu'on voudrait examiner ici. Contrairement à l'habitude, je mettrai ces textes en relation avec une certaine tradition du nomadisme littéraire. Je montrerai ensuite en quoi Bouvier tente, à travers une volontaire « retraite » du moi, de mettre à distance l'orientalisme des voyageurs du XIXe siècle. Enfin, je proposerai de lire cette quête de l'altérité comme une manière, pour Bouvier, de refonder son identité, et du même coup son rapport de voyageur occidental à l'Orient.

A Monograph of the Helotrephidae, subfamily Helotrephinae (Hem. Heteroptera)

Since the family Helotrephidae was described, the authors have been able to borrow (thanks to the courtesy of Prof. Bouvier and Dr. Séguy, of the National Museum of Natural History, Paris, and of Dr. Bischoff, of the Zoological Museum, Berlin), the type material of Helotrephes bouvieri Kirk. and H. martini Kirk., a specimen of H. emerita Horv., and a new species which it is proposed to describe as H. kirkaldyi.Peer reviewe

Camelot Remade

The objective of this design was to reinvent Jacqueline Bouvier Kennedy’s wedding dress. The dress embodies two details, which are intriguing about 1950’s designs: a full skirt and cinched waist

Sublating Kant and the Old Metaphysics: A Reading of the Transition from Being to Essence in Hegel's Logic

Kant’s “transcendental” or “critical” philosophy is an instance of what can be called the “critique of immediacy.” As part of his critical project, Kant argues that one cannot merely assume that there is a reestablished harmony between thought and being. Instead, one must effect a “return to the subject” and examine the forms of thought themselves, in order to determine the extent to which thought and being are commensurable. As a result of his “transcendental turn,” Kant concludes that what at first appears as immediately given to thought is always already (at least partly) the result of some kind of activity or mediation on the part of the thought itself. Hegel approves of Kant’s critical orientation: Kant correctly demanded to know “how far the forms of thought were capable of leading to the knowledge of truth,” and correctly concluded that “the forms of thought must be made into an object of investigation.” However, for Hegel, the problem with Kant was that he aimed to examine the forms of thought as if they were necessarily separated from being itself. Thus the Kantian strategy, for Hegel, led to a twofold absurdly

Magnetic shuffling of coronal downdrafts

Channelled fragmented downflows are ubiquitous in magnetized atmospheres, and have been recently addressed from an observation after a solar eruption. We study the possible back-effect of the magnetic field on the propagation of confined flows. We compare two 3D MHD simulations of dense supersonic plasma blobs downfalling along a coronal magnetic flux tube. In one, the blobs move strictly along the field lines; in the other, the initial velocity of the blobs is not perfectly aligned to the magnetic field and the field is weaker. The aligned blobs remain compact while flowing along the tube, with the generated shocks. The misaligned blobs are disrupted and merged by the chaotic shuffling of the field lines, and structured into thinner filaments; Alfven wave fronts are generated together with shocks ahead of the dense moving front. Downflowing plasma fragments can be chaotically and efficiently mixed if their motion is misaligned to field lines, with broad implications, e.g., disk accretion in protostars, coronal eruptions and rain.Comment: 9 pages, 4 figures, proposed for acceptance, movies available upon request to the first autho

The Effect of Age upon CEO Compensation: A Cross-Industry Study

The compensation of CEO’s has been at the forefront of the public’s mind for the past few years. During the recession, one could not go a day without hearing about the atrocious salaries and bonuses that executives were being paid. Although it only recently became an explosive topic, academics have been researching all aspects of compensation for many years. One of the earliest looked at the idea of pay for performance (Jensen and Murphy 1990), and the field has taken off from there. Many studies have been done on the determinants of compensation, and I was interested in how age relates to compensation. I created a model for determining compensation, but also took it one step further and looked at the compensation structure across different industries as well. I found that age did indeed influence compensation levels, but that it only had some effect on pay structure and only in certain industries