No abstract

This paper builds on the author's previous theoretical work on the role of processes such as enclosures, market discipline and governance. It discusses the middle class in terms of a stratified field of subjectivity within the planetary wage hierarchy produced by these processes. It discusses the thesis that the middle class, qua middle class, will never be able to contribute to bring about a fundamental change in the capitalist system of livelihood reproduction. The production in common centered on middle class values-however historically and culturally specific they are-is always production in common within the system. Our common action as middle class action, whether as consumers, workers, or citizens, reproduces the system of value and value hierarchy that is the benchmark, the referent point for our cooperation. The paper then discusses some of the implications of the conundrum faced by those who seek alternatives: there will be no "beginning of history" without the middle class, nor there will be one with the middle class.

No abstract

Aims. Open Universe for blazars is a set of high-transparency multi-frequency data products for blazar science, and the tools designed to generate them. Blazars are drawing growing interest following the consolidation of their position as the most abundant type of source in the extragalactic very-high energy γ-ray sky, and because of their status as prime candidate sources in the nascent field of multi-messenger astrophysics. As such, blazar astrophysics is becoming increasingly data driven, depending on the integration and combined analysis of large quantities of data from the entire span of observational astrophysics techniques. The project was therefore chosen as one of the pilot activities within the United Nations Open Universe Initiative. Methods. We aim to deliver innovative data science tools for multi-messenger astrophysics. In this work we developed a data analysis pipeline called Swift-DeepSky based on the Swift XRTDAS software and the XIMAGE package, encapsulated into a Docker container. Swift-DeepSky downloads and reads low-level data, generates higher-level products, detects X-ray sources and estimates several intensity and spectral parameters for each detection, thus facilitating the generation of complete and up-to-date science-ready catalogues from an entire space-mission dataset. The Docker version of the pipeline -whose concept can be reproduced with other missions -and its derived products is publicly available from the Open Universe Website at openuniverse.asi.it Results. We present the results of a detailed X-ray image analysis based on Swift-DeepSky that was run on all Swift XRT observations including a known blazar, carried out during the first 14 years of operations of the Neil Gehrels Swift Observatory. Short exposures executed within one week of each other have been added to increase sensitivity, which ranges between ∼ 1 × 10 −12 and ∼ 1 × 10 −14 erg cm −2 s −1 (0.3-10.0 keV). After cleaning for problematic fields, the resulting database includes over 27,000 images integrated in different X-ray bands, and a catalogue, called 1OUSXB, that provides intensity and spectral information for 33,396 X-ray sources, 8,896 of which are single or multiple detections of 2,308 distinct blazars. All the results can be accessed on-line in a variety of ways: e.g., from the Open Universe portal at openuniverse.asi.it, through Virtual Observatory services, via the VOU-Blazar tool and the SSDC SED builder. One of the most innovative aspects of this work is that the results can be safely reproduced and extended by anyone.

Blazars research is one of the hot topics of contemporary extragalactic astrophysics. That is because these sources are the most abundant type of extragalactic γ-ray sources and are suspected to play a central role in multi-messenger astrophysics. We have used swift$\_$xrtproc, a tool to carry out an accurate spectral and photometric analysis of the Swift-XRT data of all blazars observed by Swift at least 50 times between December 2004 and the end of 2020. We present a database of X-ray spectra, best-fit parameter values, count-rates and flux estimations in several energy bands of over 31,000 X-ray observations and single snapshots of 65 blazars. The results of the X-ray analysis have been combined with other multi-frequency archival data to assemble the broad-band Spectral Energy Distributions (SEDs) and the long-term lightcurves of all sources in the sample. Our study shows that large X-ray luminosity variability on different timescales is present in all objects. Spectral changes are also frequently observed with a “harder-when-brighter” or “softer-when-brighter” behaviour depending on the SED type of the blazars. The peak energy of the synchrotron component (νpeak) in the SED of HBL blazars, estimated from the log-parabolic shape of their X-ray spectra, also exhibits very large changes in the same source, spanning a range of over two orders of magnitude in Mrk421 and Mrk501, the objects with the best data sets in our sample.