Results 11 to 20 of about 8,434 (211)
A persistent influence of supernovae on biodiversity over the Phanerozoic. [PDF]
Ecol Evol, 2023 It shows the correlation between diversity and supernovae frequency. Abstract It is an open question what has constrained macroevolutionary changes in marine animal diversity on the time scale of the Phanerozoic. Here, we will show that supernovae appear to have significantly influenced the biodiversity of life.
Svensmark H.
europepmc +2 more sources
EARLY-TYPE HOST GALAXIES OF TYPE II AND Ib SUPERNOVAE [PDF]
The Astrophysical Journal, 2011 Recent studies find that some early-type galaxies host Type II or Ibc supernovae (SNe II, Ibc). This may imply recent star-formation activities in these SNe host galaxies, but a massive star origin of the SNe Ib so far observed in early-type galaxies has been questioned because of their intrinsic faintness and unusually strong Ca lines shown in the ...
Suh, Hyewon +3 more
openaire +2 more sources
The Astrophysical Journal, 2023 The relation between the progenitor mass and the kinetic energy of the explosion is a key toward revealing the explosion mechanism of stripped-envelope core-collapse supernovae (SESNe).
Qiliang Fang, Keiichi Maeda
doaj +1 more source
ChemPlusChem, Volume 88, Issue 12, December 2023., 2023 Large modifications of light emission of benzofuran‐cyanostilbene derivatives in the solid state can be achieved through the insertion of methoxy groups or the extension of benzofuran units, thus making it possible to access a whole range of emission spectra, which present excitonic or excimeric contributions depending on the stacking modes of the ...
Jihad Abdo +4 more
wiley +1 more source
Bridging between Type IIb and Ib Supernovae: SN IIb 2022crv with a Very Thin Hydrogen Envelope
The Astrophysical Journal, 2023 We present optical, near-infrared, and radio observations of supernova (SN) SN IIb 2022crv. We show that it retained a very thin H envelope and transitioned from an SN IIb to an SN Ib; prominent H α seen in the pre-maximum phase diminishes toward the ...
Anjasha Gangopadhyay +28 more
doaj +1 more source
Comparative study of conventional and synchrotron X‐ray electron densities on molecular crystals
Acta Crystallographica Section B, Volume 79, Issue 5, Page 380-391, October 2023., 2023 Four electron density quality single crystal X‐ray diffraction datasets on molecular crystals of melamine were obtained from both state‐of‐the‐art laboratory instruments (Rigaku Synergy with Ag Kα and Mo Kα, Stoe Stadivari with Mo Kα) and an older X‐ray diffractometer (Oxford Diffraction Supernova with Mo Kα) and the data quality and electron density ...
Emilie S. Vosegaard +3 more
wiley +1 more source
Type Ib Supernova 2007uy – a multiwavelegth perspective [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractWe present the results from a comprehensive analysis of a Type Ib supernova (SN) 2007uy in a nearby galaxy NGC 2770 (~30 Mpc), using data from space-based Swift/UVOT, along with ground-based observations at visible, infrared and radio wave bands.
Rupak Roy, Brijesh Kumar
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Coordination chemistry of pnictogenylboranes towards group 6 transition metal Lewis acids
Zeitschrift für anorganische und allgemeine Chemie, Volume 649, Issue 4, February 13, 2023., 2023 Abstract The coordination behavior of different pnictogenylboranes towards group 6 metal Lewis acids is investigated. The resulting complexes with phosphanylboranes [(CO)4M(PH2BH2 ⋅ NMe3)2] (M=Cr, Mo, W; 1–3), arsanylboranes ([(CO)4M(AsH2BH2 ⋅ NMe3)2] (M=Cr, Mo, W; 4–6) and tBu‐substituted phosphanylboranes [(CO)4M(tBuPHBH2 ⋅ NMe3)2] (M=Cr, W; 7–8) are
Felix Lehnfeld +4 more
wiley +1 more source
Chemistry – A European Journal, Volume 27, Issue 22, Page 6783-6794, April 16, 2021., 2021 Anticancer NHC complexes: RhI and IrI N‐heterocyclic carbene (NHC) complexes provide an auspicious class of potential new anticancer agents; however, cellular imaging with luminescent derivatives of these complex types is often hampered by luminescence quenching.
Isabelle Marie Daubit +5 more
wiley +1 more source
Optical Color of Type Ib and Ic Supernovae and Implications for Their Progenitors
The Astrophysical Journal, 2023 Type Ib and Ic supernovae (SNe Ib/Ic) originate from hydrogen-deficient massive star progenitors, of which the exact properties are still much debated.
Harim Jin +2 more
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