Tag: Galaxy
Most LRDs fit case B recombination, with one major exception
—
in AstronomyWhat the study found Most Little Red Dots (LRDs), compact extragalactic objects with a v-shaped optical spectrum and broad lines, are broadly consistent with case B recombination, a standard model for hydrogen emission in ionized gas. One object, RUBIES-EGS-4233_49140 at redshift 6.68, shows a strong and unusual deviation. Why the authors say this matters The…
Changing-look AGNs appear to be typical host-galaxy systems
—
in AstrophysicsWhat 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…
NUV-blue spirals show star-forming outer disks
—
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
—
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.
Milky Way circular velocity measured from stellar abundances
—
in AstrophysicsA new data-driven method measures the Milky Way’s circular velocity using element abundance gradients, deriving rotation parameters at the solar radius.
Cored stellar systems can remain stable in cuspy dark matter halos
—
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.
