Tag: Galaxies: Formation, Evolution, Phenomena
Cluster stellar mass growth is mostly established by redshift 0.8
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in AstronomyWhat 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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in AstrophysicsWhat 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…
AGN jet lobe growth matches self-similar scaling
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in AstrophysicsWhat 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…
NUV-blue spirals show star-forming outer disks
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in AstronomyStudy reveals why optically red spiral galaxies show ultraviolet-blue colors: quenched centers with active outer disks sustained by fresh gas accretion or galaxy interactions.
Deep Chandra observations of a relaxed z = 1.16 galaxy cluster
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in AstrophysicsChandra X-ray observations of SPT-CL J2215-3537 resolve the cool core of this z = 1.16 relaxed galaxy cluster, establishing a high-redshift benchmark for cluster evolution studies.
RUBIES finds many massive quiescent galaxies at 2 < z < 5
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in AstrophysicsSpectroscopic observations confirm that massive quiescent galaxies were surprisingly common at redshifts 2-5, challenging galaxy formation simulations.
Cored stellar systems can remain stable in cuspy dark matter halos
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in AstrophysicsSimulations demonstrate that cored stellar systems remain stable within cuspy dark matter halos over Hubble timescales, refuting recent claims that such configurations would falsify cold dark matter.
