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  • 1
    Publikationsdatum: 2017-12-02
    Beschreibung: Galaxies, Vol. 5, Pages 93: Linear Polarization Properties of Parsec-Scale AGN Jets Galaxies doi: 10.3390/galaxies5040093 Authors: Alexander Pushkarev Yuri Kovalev Matthew Lister Tuomas Savolainen Margo Aller Hugh Aller Mary Hodge We used 15 GHz multi-epoch Very Long Baseline Array (VLBA) polarization sensitive observations of 484 sources within a time interval 1996–2016 from the MOJAVE program, and also from the NRAO data archive. We have analyzed the linear polarization characteristics of the compact core features and regions downstream, and their changes along and across the parsec-scale active galactic nuclei (AGN) jets. We detected a significant increase of fractional polarization with distance from the radio core along the jet as well as towards the jet edges. Compared to quasars, BL Lacs have a higher degree of polarization and exhibit more stable electric vector position angles (EVPAs) in their core features and a better alignment of the EVPAs with the local jet direction. The latter is accompanied by a higher degree of linear polarization, suggesting that compact bright jet features might be strong transverse shocks, which enhance magnetic field regularity by compression.
    Digitale ISSN: 2075-4434
    Thema: Physik
    Publiziert von MDPI
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2016-11-11
    Beschreibung: Drawing on a survey of large-scale ecological restoration initiatives, we find that managers face contradictory demands. On the one hand, they have to raise funds from a variety of sources through competitive procedures for individual projects. These projects require the specification of deliverable outputs within a relatively short project period. On the other hand, ecologists argue that the complexity of ecosystem processes means that it is not possible to know how to deliver predetermined outcomes and that governance should be adaptive, long-term and implemented through networks of stakeholders. This debate parallels a debate in public administration between New Public Management and more recent proposals for a new approach, sometimes termed Public Value Management. Both of these approaches have strengths. Projectification provides control and accountability to funders. Adaptive governance recognises complexity and provides for long-term learning, building networks and adaptive responses. We suggest an institutional architecture that aims to capture the major benefits of each approach based on public support dedicated to ecological restoration and long-term funding programmes.
    Digitale ISSN: 2073-445X
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Publiziert von MDPI
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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