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 the results of a joint \chandra-\hst study of the X-ray binarypopulation in the massive, high-density globular cluster NGC 6388. NGC 6388 hasone of the highest predicted X-ray binary production rate of any Galacticcluster. We detected a large population of 61 \chandra sources within thehalf-mass radius with L$_X > 5 \times 10^{30}$ \ergs. From the X-ray colors,luminosities, (lack of) variability, and spectral fitting, we identify five aslikely quiescent low-mass X-ray binaries. Due to the extremely crowded natureof the core of NGC 6388, finding optical identifications to \chandra sources ischallenging. We have identified four blue, optically variable counterparts tospectrally hard X-ray sources, evidence that these are bright cataclysmicvariables (CVs). One showed variability of 2 magnitudes in V, indicative of adwarf nova eruption. One other likely CV is identified by its X-ray spectrum(partial covering with high $N_H$) and strong variability, making five likelyCVs identified in this cluster. The relatively bright optical magnitudes ofthese sources put them in the same class as CV1 in M15 and the brightest CVs in47 Tuc.

X-ray Binaries in the Ultrahigh Encounter Rate Globular Cluster NGC 6388