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

Using archival {\it Chandra} observations with a total effective exposure of323 ks, we derive an updated catalog of point sources in the bulge globularcluster M28. The catalog contains 502 X-ray sources within an area of$\sim475\, \rm arcmin^{2}$, and more than $90\%$ of these sources are firstdetected in this cluster. We find significant dips in the radial distributionprofiles of X-ray sources in M28, with the projected distance and width of thedistribution dip for bright ($L_{X} \gtrsim 4.5\times 10^{30} {\rm\ erg\\,s^{-1}}$) X-ray sources are larger than the faint ($L_{X} \lesssim 4.5\times10^{30} {\rm\ erg\ \,s^{-1}}$) sources. The "generalized King model" fittinggive a slightly larger average mass for the bright sources($1.30\pm0.15\,M_{\odot}$) than the faint sources ($1.09\pm0.14\,M_{\odot}$),which support a universal mass segregation delay between heavy objects in GCs.Compared with 47 Tuc and Terzan 5, we show that the dynamical age of M28 iscomparable to Terzan 5 and much smaller than 47 Tuc, but it is evolving morefast (i.e., with smaller two-body relaxation timescale) than 47 Tuc. Thesefeatures may suggest an acceleration effect of cluster dynamical evolution bytidal shock in M28. Besides, we find an abnormal deficiency of X-ray sources inthe central region ($R \lesssim 1.5 \rm~arcmin$) of M28 than its outskirts,which indicate that M28 may have suffered an early phase of primordial binarydisruption within its central region, and mass segregation effect will erasesuch a phenomenon as cluster evolve to older dynamical age.

Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters. III. Signs of Binary Disruption in M28