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Tag: Astronomy and Astrophysics

  • Pancakes in 2D cosmic structure are mostly C-shaped

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    What the study found In 2D cold dark matter cosmologies, the study found that many pancakes evolve into filaments, while pancakes that evolve into halos are more strongly curved. The shapes are mostly C-shaped, and shell crossing is highly anisotropic, meaning it differs by direction. Why the authors say this matters The authors say this…

  • Cluster stellar mass growth is mostly established by redshift 0.8

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    What the study found The study found that, in a sample of massive galaxy clusters, the characteristic stellar mass in the cluster stellar mass function evolves only slightly from redshift 0.8 to 0.55, and that most measurable growth happens between redshift 0.55 and 0.2. The authors also report evidence that the stellar mass fraction in…

  • LMC corona measurements favor a first-passage orbit

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    What the study found The study found that the Large Magellanic Cloud’s (LMC’s) gaseous halo, or corona, is more consistent with a first-passage orbital model than a second-passage model. In the authors’ simulations, the first-passage case matched the observed present-day velocity and column density profiles more closely. Why the authors say this matters The authors…

  • Higher-order statistics improve constraints on reionization history

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    What the study found Betti numbers, a non-Gaussian statistic that captures topological features, were on average more informative than the power spectra for constraining the average neutral hydrogen fraction. The bispectrum was described as providing limited constraints, but combining higher-order statistics with the cylindrical power spectrum improved the mean figure of merit. Why the authors…

  • Residual-based equivalence links blazar variability and moral surplus

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    What the study found The study says that the anomalous variability of C3 blazars and the moral surplus of individuals measured by the Hikari (光貨) algorithm are structurally equivalent. Why the authors say this matters The authors conclude that both kinds of residuals point to something in the underlying field (間, Ma) that current measurement…

  • Changing-look AGNs appear to be typical host-galaxy systems

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    What the study found The study found that changing-look active galactic nuclei, or CL-AGNs, in this sample generally look like ordinary AGN host systems rather than a separate class. Their black holes roughly follow the same scaling relations seen in inactive galaxies, and their host-galaxy properties do not appear different from those of type 2…

  • Artificial satellite arrays improve axionlike dark matter sensitivity

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    What the study found A proposed Artificial Pulsar Polarization Array (APPA) — a satellite network with multiple pulsed signal transmitters and one receiver satellite — was simulated to test sensitivity to axionlike dark matter. The simulations indicated that APPA could give a tighter upper limit on the axion-photon coupling parameter, g_aγ, than conventional ground-based observations…

  • AGN jet lobe growth matches self-similar scaling

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    What the study found AGN jet lobe growth followed analytic self-similar scaling relations and converged with resolution. The authors also found that the energy split between thermal and kinetic forms departed from the idealized picture and depended strongly on artificial viscosity. Why the authors say this matters The findings indicate that SPH-based jet modeling can…

  • Poster odds for strong gravitational-wave lensing are insensitive to event count

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    What the study found The study finds that posterior odds for strong gravitational-wave lensing become insensitive to the number of gravitational-wave events in the data once strong-lensing time delays are accounted for. The authors also state that selection effects cancel out in the posterior odds and do not affect frequentist approaches to strong-lensing detection. Why…

  • Non-Gaussian redshift-space Minkowski tensors show qualified perturbation-theory success

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    What the study found The study found that perturbation-theory predictions for Minkowski tensors in redshift space are a qualified success when compared with dark matter simulation measurements. It also found that nonperturbative Finger-of-God effects remain significant at relatively large scales, especially in components parallel to the line of sight. Why the authors say this matters…