Context. The identification of the sources that reionized the Universe and their specific contribution to this process are key missing pieces of our knowledge of the early Universe. Faint star-forming galaxies may be the main contributors to the ionizing photon budget during the epoch of reionization, but their escaping photons cannot be detected directly due to inter-galactic medium opacity. Hence, it is essential to characterize the properties of faint galaxies with significant Lyman continuum photon leakage up to z 4 to (...) define indirect indicators allowing analogues to be found at the highest redshift. Aims. Long gamma-ray bursts explode typically in star-forming regions of faint, star-forming galaxies. Through LGRB afterglow spectroscopy it is possible to detect directly LyC photons. Our aim is to use LGRBs as tools to study LyC leakage from faint, star-forming galaxies at high redshift. Methods. Here we present the observations of LyC emission in the afterglow spectra of GRB 191004B at z = 3:5055, together with those of the other two previously known LyC-emitting LGRB, to determine their LyC escape fraction and compare their properties. Results. From the afterglow spectrum of GRB 191004B we determine a neutral hydrogen column density at the LGRB redshift of og =17:2 0:15, and negligible extinction. The only metal absorption lines detected are C iv and Si iv. In contrast to GRB 050908 and GRB 060607A, the host galaxy of GRB 191004B displays significant Ly emission. From its Ly emission and the non-detection of Balmer emission lines we constrain its star-formation rate to 1 SFR 4:7 M yr. 1. We fit the Ly emission with a shell model and find parameters values consistent with the observed ones. The absolute LyC escape fractions we find for GRB 191004B, GRB 050908 and GRB 060607A are of 0:35+0:10.0:11, 0:08+0:05.0:04 and :20+0:05.0:05, respectively. We compare the LyC escape fraction of LGRBs to the values of other LyC emitters found from the literature, showing that LGRB afterglows can be powerful tools to study LyC escape for faint high-redshift star-forming galaxies. Indeed we could push LyC leakage studies to much higher absolute magnitudes. The host galaxies of the three LGRB presented here have all M1600 >.19:5 mag, with the GRB 060607A host at M1600 >.16 mag. LGRB hosts may therefore be particularly suitable for exploring the ionizing escape fraction in galaxies that are too faint or distant for conventional techniques. Furthermore the time investment is very small compared to galaxy studies. (shrink)

What is property? Not so long ago, at least in the western legal tradition, answering this question might have been possible by adverting to a very small number of resources – perhaps as few as the...

The “family rule” paper by Dr Foreman proposes a way of resolving the present uncertainty about medical law on children's consent and refusal. This commentary reviews how doctors' decisions are already well protected by English law and respected by the courts. The “family rule” appears to be likely only to complicate the already diffuse law on parental consent, and to weaken further the competent minor's position in cases of uncertainty and disagreement. It leaves the difficult questions about defining and assessing (...) children's competence unanswered. This commentary suggests that these questions would be better resolved through professionally determined standards of good practice that respect children and parents, rather than through rules or laws. (shrink)

An edition of the letters of Erasmus, regarded as one of the greatest humanist writers. All 12 volumes of this work have been reissued, complete with their scholarly apparatus of commentary and notes, as well as plates.

An edition of the letters of Erasmus, regarded as one of the greatest humanist writers. All 12 volumes of this work have been reissued, complete with their scholarly apparatus of commentary and notes, as well as plates.

Phenomenology and experimental psychology have been largely interested in the same thing when it comes to attention. By building on the work of Aron Gurwitsch, especially his ideas of attention and restructuration, this paper attempts to articulate common ground in psychology and phenomenology of attention through discussion of a new way to think about multistability in some phenomena. What psychology views as an attentionality-intentionality phenomenon, phenomenology views as an intentionality-attentionality phenomenon. The proposal is that an awareness of this restructuring of (...) attentionality and intentionality can benefit both approaches to attention. After reviewing Husserl’s position on attentionality and intentionality, this paper examines multistable phenomena, redefines the attentional transformation called restructuring, discusses disciplinary perspectives on attention and gives an example using common ground. (shrink)

Aristote, tout aussi bien que Descartes et Kant, fonde en fait la science sur les exigences ou postulats de la raison. L’idéalisme moderne justifie ces postulats en considérant le monde comme l’expression de l’esprit; c’est là une solution traditionnelle remontant à l'antique théorie du Logos ; seulement les idéalistes nient la dualité de l’être et de la pensée ; à cette doctrine d’immanence, on oppose une doctrine ou l’etre et la pensée tirent leur unité ou homogénéité relative d’une unité transcendante, (...) qui n’est pas du même ordre. Les postulats de la raison ont alors une valeur objective parce que la raison est expression d’être. (shrink)

‘Some of Martial's shortest epigrams are also the obscurest’, observes P. T. Eden, apropos of 1.102. This two-line poem has certainly generated a remarkable diversity of interpretations. All the critics are agreed that the portrait of Venus owned by the courtesan Lycoris is in some way botched or unattractive, but, beyond this, their explanations differ widely.

Let P be any one of the following combinatorial properties: weak P-pointness, weak (semi-) Q-pointness, weak (semi-)selectivity, ω-closedness. We deal with the following two questions: (1) What is the least cardinal κ such that there exists an ideal with κ many generators that does not have the property P? (2) Can one extend every ideal with the property P to a prime ideal with the property P?