The hunt for red AGN: a new infrared diagnostic

We introduce a new infrared diagnostic to separate galaxies on the basis of their dominant infrared emission: stellar or nuclear. The main novelty with respect to existing diagnostics, is the usage of a broad band encompassing at the same time the 9.7micron Silicate absorption feature and one of the adjacent broad PAH (polycyclic aromatic hydrocarbon) features. This provides a robust estimate of the near- to mid-infrared continuum slope and enables a clear distinction among different classes of galaxies up to a redshift z=2.5. The diagnostic can be applied to a wealth of archival data from the ISO, Spitzer, and Akari surveys as well as future JWST surveys. Based on data in the GOODS, Lockman Hole, and North Ecliptic Pole (NEP) fields, we find out that approximately 70% active galactic nuclei detected with X-ray and optical spectroscopy dominate the total mid-infrared emission. Finally, we estimate that AGN contribute less than 30% of the mid-infrared extragalactic integrated emission.Comment: 5 pages, 4 figures, accepted for publication in MNRA

Self-Recognition in Data Visualization: How People See Themselves in Social Visualizations

Self-recognition is an intimate act performed by people. Inspired by Paul Ricoeur, we reflect upon the action of self-recognition, especially when data visualization represents the observer itself. Along the article, the reader is invited to think about this specific relationship through concepts like the personal identity stored in information systems, the truthfulness at the core of self-recognition, and the mutual-recognition among community members. In the context of highly interdisciplinary research, we unveil two protagonists in data visualization: the designer and the observer - the designer as the creator and the observer as the viewer of a visualization. This article deals with some theoretical aspects behind data visualization, a discipline more complex than normally expected. We believe that data visualization deserves a conceptual framework, and this investigation pursues this intention. For this reason, we look at the designer as not just a technician in the visualization production, but as a contemporary ethnologist - the designer as a professional working in a social environment to comprehend the context and formulate a specific inquiry with the help of appropriate visual languages

Extending museum beyond physical space:A Data-Driven Study of Aldo Rossi's Analogous City as a Mobile Museum Object

Aldo Rossi composed the famous collage known as Analogous City for the Venice Biennale in 1976. This text presents a visual study of the collage through both physical and digital means: a mobile app works in conjunction with a reprint of the Analogous City in the format of a city map. Forty years after its creation, the collage’s original elements are finally identified and collected, and the mechanisms of composition are disclosed thanks to Fabio Reinhart’s contribution. The map of the Analogous City is analyzed in both historical and museum viewpoints, focusing on the reflections that emerged when exhibiting in Maastricht, Milan, Lausanne, Bergamo, and Rome. Although the map was designed as an interactive installation for these exhibitions, it has turned out to be also an educational tool useful outside museums. If Aldo Rossi created an artwork to think about the reconstruction of the city, likewise, the map of the Analogous City helps to rethink museums by designing their objects in a way they can leave the exhibition for a second life in the city

Ars Memorativa as the Genesis of Information Design:A Conversation with Manuel Lima

Manuel Lima is one of the most prominent figures of data visualization since the publication of Visual Complexity (Lima 2011). In this conversation, Manuel Lima traces back the origin of data visualization to Ars Memorativa, an ancient mnemonic technique to organize information and facilitate its recall. Going back to the origins is an obsession that brought him to collect and arrange into books images of information design from both physical and digital archives. By doing this, Manuel Lima tackled issues related to the digital objects and their creation, use, and preservation, with a point of view capable of combining the passion for visualizing information and the profession of UX design. This conversation, which took place between Lisbon and Milan on Wednesday 28 July, 2021, comes from a blurb that Manuel Lima wrote for Mapping Affinities (Rodighiero 2021). The discussion is part of the project From Data to Wisdom, and is supported by Fundação para a Ciência e a Tecnologia through the grant POCI-01-0145-FEDER-029717, and the Swiss National Science Foundation through the grant 194442. This text, originally created for the forthcoming book From Data to Wisdom (Higuera Rubio et al. 2022), is published as a preview for Nightingale, the journal of the Data Visualization Society

Digital Humanities 2014: representing a controverted definition

The network portrays all keywords used in the Digital Humanities 2014 conference, which will take place in Lausanne, Switzerland. The keywords‚ represented by nodes‚have been freely chosen by each author attending the conference, contributed via their papers and posters. Edges represent keywords appearing together in a contribution. The weight of the edges measures the occurrence of keywords pairs, multiplied by the number of authors creating them. The visualization is meant as a talking point, to foster a debate about the controversial definition of the Digital Humanities domain

Printing Walkable Visualizations

This article concerns a specific actor in the actualization process, the media. The conventional media for visualizations is the computer screen, a visual device that supports the practices of design and reading. However, visualizations also appear in other ways, for example as posters, articles, books, or projections. This article focuses, in particular, on a pretty unusual medium called floor or walkable visualization

Visualizing Complex Organizations with Data

The Affinity Map is a project founded by the ENAC whose aim is to provide an instrument to understand organizations. The photograph shows the disclosure of the first map for the ENAC Research Day. The visualization was presented to scholars who are displayed in the representation itself

Mapping affinities: visualizing academic practice through collaboration

Academic affinities are one of the most fundamental hidden dynamics that drive scientific development. Some affinities are actual, and consequently can be measured through classical academic metrics such as co-authoring. Other affinities are potential, and therefore do not have visible traces in information systems; for instance, some peers may share scientific interests without actually knowing it. This thesis illustrates the development of a map of affinities for scientific collectives, which is intended to be relevant to three audiences: the management, the scholars themselves, and the external public. Our case study involves the School of Architecture, Civil and Environmental Engineering of EPFL, which consists of three institutes, seventy laboratories, and around one thousand employees. The actual affinities are modeled using the data available from the academic systems reporting publications, teaching, and advising, whereas the potential affinities are addressed through text mining of the documents registered in the information system. The major challenge for designing such a map is to represent the multi-dimensionality and multi-scale nature of the information. The affinities are not limited to the computation of heterogeneous sources of information, they also apply at different scales. Therefore, the map shows local affinities inside a given laboratory, as well as global affinities among laboratories. The thesis presents a graphical grammar to represent affinities. This graphical system is actualized in several embodiments, among which a large-scale carpet of 250 square meters and an interactive online system in which the map can be parameterized. In both cases, we discuss how the actualization influences the representation of data, in particular the way key questions could be appropriately addressed considering the three target audiences: the insights gained by the management and the relative decisions, the understanding of the researchersâ own positioning in the academic collective that might reveal opportunities for new synergies, and eventually the interpretation of the structure from an external standpoint that suggesting the relevance of the tool for communication