English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present our XMM-Newton observation of the fastest rotating spiral galaxyUGC 12591. We detect hot gas halo emission out to 110 kpc from the galaxycenter, and constrain the halo gas mass to be smaller than 3.5e11 solar masses.We also measure the temperature of the hot gas as T=0.64\pm0.03 keV. Combiningour X-ray constraints and the near-infrared and radio measurements in theliterature, we find a baryon mass fraction of 0.03-0.04 in UGC 12591,suggesting a missing baryon mass of 75% compared with the cosmological meanvalue. Combined with another recent measurement in NGC 1961, the resultstrongly argues that the majority of missing baryons in spiral galaxies doesnot reside in their hot halos. We also find that UGC 12591 lies significantlybelow the baryonic Tully-Fisher relationship. Finally, we find that the baryonfractions of massive spiral galaxies are similar to those of galaxy groups withsimilar masses, indicating that the baryon loss is ultimately controlled by thegravitational potential well. The cooling radius of this gas halo is small,similar to NGC 1961, which argues that the majority of stellar mass of thisgalaxy is not assembled as a result of cooling of this gas halo.

XMM-Newton Detects a Hot Gaseous Halo in the Fastest Rotating Spiral Galaxy UGC 12591