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 report $Suzaku$ X-ray observations of the dark subhalo associated with themerging group of NGC 4839 in the Coma cluster. The X-ray image exhibits anelongated tail toward the southwest. The X-ray peak shifts approximately $1'$away from the weak-lensing mass center toward the opposite direction of theComa cluster center. We investigated the temperature, normalization, pressure,and entropy distributions around the subhalo. Excluding the X-ray tail, thetemperature beyond the truncation radius is 8-10$~\rm keV$, which is two timeshigher than that of the subhalo and the X-ray tail. The pressure is nearlyuniform excluding southern part of the subhalo at two times of the truncationradius. We computed the gas mass within the truncation radius and the X-raytail. While the gas fraction within the truncation radius is about 5 timessmaller than that of regular groups, the gas mass in the subhalo and the X-raytail to weak-lensing mass ratio is consistent with that of regular groups.Assuming the infall velocity, $2000~\rm km~s^{-1}$, the ram pressure is 1.4times greater than gravitational force per unit area. Assuming theKelvin-Helmholtz instabilities, the total lost mass is approximately$3\times10^{11}~M_{\odot}$. If this gas had originally been within thetruncation radius, the gas mass fraction of the subhalo would have beencomparable with those of regular groups before infalling to the Coma cluster.

X-Ray observations of a subhalo associated with the NGC 4839 group infalling toward the Coma cluster