The Formation of Brown Dwarfs: Observations

We review the current state of observational work on the formation of brown dwarfs, focusing on their initial mass function, velocity and spatial distributions at birth, multiplicity, accretion, and circumstellar disks. The available measurements of these various properties are consistent with a common formation mechanism for brown dwarfs and stars. In particular, the existence of widely separated binary brown dwarfs and a probable isolated proto-brown dwarf indicate that some substellar objects are able to form in the same manner as stars through unperturbed cloud fragmentation. Additional mechanisms such as ejection and photoevaporation may play a role in the birth of some brown dwarfs, but there is no observational evidence to date to suggest that they are the key elements that make it possible for substellar bodies to form.Comment: Protostars and Planets V, in pres

The Rejection of the Epicurean Ideal of Pleasure in Late Antique Sources: not Only Misunderstandings

No disponible en català. Vegeu resum en anglèsEpicureanism was seen by its opponents, both ‘pagan’ and Christian, as the philosophy of pleasure and atheism. From the theological point of view, the accusation of atheism was incorrect, since Epicurus and the Epicureansadmitted of the existence of deities, and posited them as models of moral perfection, while denying their interest in human affairs, i. e. providence. This denial aimed at guaranteeing their imperturbability (ataraxia). From the ethical point of view, the ideal of pleasure (hedone), on which I shall concentrate here, was grossly misunderstood or distorted by the opponents of Epicureanism, who generally did not take into consideration the moderation, equilibrium, and serenity that the superior ‘catastematic pleasure’ (Epicurus’s real ideal of pleasure) involved. I shall analyse the attitude of late-antique sources, especially Christian, toward Epicureanism and its ethics. A great many of Usener’s and Arrighetti’s fragments of Epicurus indeed come from Christian late-antique authors, such as Clement, Origen, Eusebius, Lactantius, and Augustine, but other patristic authors should be added, such as Basil and Gregory of Nyssa. Even if patristic interest in Epicureanism is often critical, and sometimes imprecise or distorted, nevertheless it is tangible. I shall focus on the authors who make the most interesting use of Epicurean sources, particularly with respect to the ethical doctrine: Origen, Dionysius of Alexandria, Lactantius, Ambrose, Jerome and Augustine, Gregory Nyssen, and Nazianzen, the only one who really understood and praised Epicurus’s notion of hedone. I shall also argue that the fading away of the availability and use of good sources on Epicureanism, along with the disappearance of the Epicurean school itself, brought about an impoverishment in the understanding of, and hostility to, Epicurus and Epicureanism

Religion and Science in Gregory of Nyssa: The Unity of the Creative and Scientific Logos

I have chosen to focus on Gregory of Nyssa’s approach to science, for this conference, because, among all the religious thinkers I know, he is one of the very richest theologians and mystics and, at the same time, the one most interested in science, with a positive attitude towards it. Indeed, Gregory († 394ca.) was not only one of the most outstanding theologians in Christian Patristics – a direct heir of the great philosopher, theologian and exegete Origen of Alexandria – but he was also deeply interested in science. These two aspects, theology and science, are not opposed to one another in Gregory’s thought, since both proceed from the same logos. The logos, in its most perfect form, is Christ, the Logos of God, whose full expression is found in Christian revelation (both in Scripture and, more directly, in the very Person of Jesus Christ). But it is also the same logos that has always illuminated all human intellectual achievements in philosophy and science, even among “pagans,” because it is present in every rational creature or logikon as such. Thus, to seek a rational justification and explanation – at the level of the philosophical and scientific logos – of doctrines that come from the logos of Scripture (such as the doctrine of the resurrection) is for Gregory an operation that is not only fully legitimate but also necessary on a very theoretical plane. In sum, for Gregory, science, philosophy and theology are all grounded in the logos and thus ultimately consistent with each other. This paper is one of a collection that originated in the IAHR Special Conference “Religions, Science and Technology in Cultural Contexts:  Dynamics of Change”, held at The Norwegian University of Science and Technology on March 1–2, 2012. For an overall introduction see the article by Ulrika Mårtensson, also published here

Kinematic and stellar population properties of the counter-rotating components in the S0 galaxy NGC 1366

Context. Many disk galaxies host two extended stellar components that rotate in opposite directions. The analysis of the stellar populations of the counter-rotating components provides constraints on the environmental and internal processes that drive their formation. Aims. The S0 NGC 1366 in the Fornax cluster is known to host a stellar component that is kinematically decoupled from the main body of the galaxy. Here we successfully separated the two counter-rotating stellar components to independently measure the kinematics and properties of their stellar populations. Methods. We performed a spectroscopic decomposition of the spectrum obtained along the galaxy major axis and separated the relative contribution of the two counter-rotating stellar components and of the ionized-gas component. We measured the line-strength indices of the two counter-rotating stellar components and modeled each of them with single stellar population models that account for the \u3b1/Fe overabundance. Results. We found that the counter-rotating stellar component is younger, has nearly the same metallicity, and is less \u3b1/Fe enhanced than the corotating component. Unlike most of the counter-rotating galaxies, the ionized gas detected in NGC 1366 is neither associated with the counter-rotating stellar component nor with the main galaxy body. On the contrary, it has a disordered distribution and a disturbed kinematics with multiple velocity components observed along the minor axis of the galaxy. Conclusions. The different properties of the counter-rotating stellar components and the kinematic peculiarities of the ionized gas suggest that NGC 1366 is at an intermediate stage of the acquisition process, building the counter-rotating components with some gas clouds still falling onto the galaxy. \ua9 ESO 2017

Historical solar Ca II K observations at the Rome and Catania observatories

Here we present the little explored Ca II K archives from the Rome and the Catania observatories and analyse the digitised images from these archives to derive plage areas.Comment: 5 pages, 3 figures, to be published in "Nuovo Cimento C" as proceeding of the Third Meeting of the Italian Solar and Heliospheric Communit

Stories of courage in a group of adults with Substance Use Disorder

The treatment for drug addiction is considered a difficult path for the most of patients. As matter of fact, individuals with Substance Use Disorder (SUD) experience numerous challenges before, during and after the treatment (e.g. tackling an unpredictable, uncertain and paradoxically negative future, tackling the anxiety and anticipatory fear of physical pain associated with abstinence; decide to go beyond self-justification and self-deception). Courage could be considered a positive and functional resource to help people with SUD to face challenges and difficulties related to treatment. In connection therewith, the aim of this study was to examine, using an embedded mix method analysis, the personal stories of courage of 80 individuals with SUD in order to identify the themes and types of courage used in their life. The analysis carried out showed that individuals with SUD reported more frequently stories of courage related to their SUD condition respect to other life situation. Moreover, the quantitative analysis showed that participants used more frequently psychological courage respect to moral and physical courage when these stories were referred to their SUD condition then other life situations