Das Bathonium im Klettgau (Mitteljura, Südwest-Deutschland)

Der „Hahn’sche Fossilhorizont“ an der Basis des oberen Abschnitts der Spatkalke des Klettgaus (Südwest-Deutschland) enthält eine kondensierte Ammonitenfauna aus der Convergens- und Macrescens-Subzone der Zigzag-Zone des Unter-Bathoniums. Im untersten Bereich dieses „Hahn’schen Fossilhorizonts“ finden sich jedoch – ergänzend zu dieser kondensierten Fauna aus dem Unter-Bathonium – auch noch aufgearbeitete, artlich nicht bestimmbare Ammoniten, die möglicherweise aus der Parkinsoni-Zone stammen. Die Parkinsoni-Zone reicht jedoch sicher bis direkt an den Übergangsbereich zwischen den Spatkalken und dem „Hahn’schen Fossilhorizont“. Einige für das Unter-Bathonium des Klettgaus neue Ammonitenarten sowie einige wichtige Nachweise für das Mittel- und Ober-Bathonium werden ier vorgestellt.The “Hahn’sche Fossilhorizont” at the base of the upper part of the “Spatkalke” beds in the Klettgau area (southwestern Gemany) yields a condensed ammonite fauna of the Convergens und Macrescens subzones of the Lower Bathonian Zigzag Zone. In the lowermost part of the “Hahn’scher Fossilhorizont” occur (in addition to this condensed fauna from the Lower Bathonian) reworked ammonites, which probably stem from the Parkinsoni Zone. The Parkinsoni Zone is confirmed up to the transition between the “Spatkalke” and the “Hahn’scher Fossilhorizont”. Several ammonite taxa that are new for the Lower Bathonian of the Klettgau area, as well as several taxa that are age-diagnostic of the Middle and Upper Bathonian are presented

Das Bathonium im Klettgau (Mitteljura, Südwest-Deutschland)

Der „Hahn’sche Fossilhorizont“ an der Basis des oberen Abschnitts der Spatkalke des Klettgaus (Südwest-Deutschland) enthält eine kondensierte Ammonitenfauna aus der Convergens- und Macrescens-Subzone der Zigzag-Zone des Unter-Bathoniums. Im untersten Bereich dieses „Hahn’schen Fossilhorizonts“ finden sich jedoch – ergänzend zu dieser kondensierten Fauna aus dem Unter-Bathonium – auch noch aufgearbeitete, artlich nicht bestimmbare Ammoniten, die möglicherweise aus der Parkinsoni-Zone stammen. Die Parkinsoni-Zone reicht jedoch sicher bis direkt an den Übergangsbereich zwischen den Spatkalken und dem „Hahn’schen Fossilhorizont“. Einige für das Unter-Bathonium des Klettgaus neue Ammonitenarten sowie einige wichtige Nachweise für das Mittel- und Ober-Bathonium werden ier vorgestellt.The “Hahn’sche Fossilhorizont” at the base of the upper part of the “Spatkalke” beds in the Klettgau area (southwestern Gemany) yields a condensed ammonite fauna of the Convergens und Macrescens subzones of the Lower Bathonian Zigzag Zone. In the lowermost part of the “Hahn’scher Fossilhorizont” occur (in addition to this condensed fauna from the Lower Bathonian) reworked ammonites, which probably stem from the Parkinsoni Zone. The Parkinsoni Zone is confirmed up to the transition between the “Spatkalke” and the “Hahn’scher Fossilhorizont”. Several ammonite taxa that are new for the Lower Bathonian of the Klettgau area, as well as several taxa that are age-diagnostic of the Middle and Upper Bathonian are presented

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Search for intermediate-mass black hole binaries in the third observing run of Advanced LIGO and Advanced Virgo

International audienceIntermediate-mass black holes (IMBHs) span the approximate mass range 100−105 M⊙, between black holes (BHs) that formed by stellar collapse and the supermassive BHs at the centers of galaxies. Mergers of IMBH binaries are the most energetic gravitational-wave sources accessible by the terrestrial detector network. Searches of the first two observing runs of Advanced LIGO and Advanced Virgo did not yield any significant IMBH binary signals. In the third observing run (O3), the increased network sensitivity enabled the detection of GW190521, a signal consistent with a binary merger of mass ∼150 M⊙ providing direct evidence of IMBH formation. Here, we report on a dedicated search of O3 data for further IMBH binary mergers, combining both modeled (matched filter) and model-independent search methods. We find some marginal candidates, but none are sufficiently significant to indicate detection of further IMBH mergers. We quantify the sensitivity of the individual search methods and of the combined search using a suite of IMBH binary signals obtained via numerical relativity, including the effects of spins misaligned with the binary orbital axis, and present the resulting upper limits on astrophysical merger rates. Our most stringent limit is for equal mass and aligned spin BH binary of total mass 200 M⊙ and effective aligned spin 0.8 at 0.056 Gpc−3 yr−1 (90% confidence), a factor of 3.5 more constraining than previous LIGO-Virgo limits. We also update the estimated rate of mergers similar to GW190521 to 0.08 Gpc−3 yr−1.Key words: gravitational waves / stars: black holes / black hole physicsCorresponding author: W. Del Pozzo, e-mail: [email protected]† Deceased, August 2020