The SLUGGS Survey: HST/ACS Mosaic Imaging of the NGC 3115 Globular Cluster System

摘要: We present HST/ACS $g$ and $z$ photometry half-light radii $R_{\rm h}$ measurements of 360 globular cluster (GC) candidates around the nearby S0 galaxy NGC 3115. also include Subaru/Suprime-Cam $g$, $r$, $i$ 421 additional candidates. The well-established color bimodality GC system is obvious in photometry. find evidence for a "blue tilt" blue GCs, wherein GCs get redder as luminosity increases, indicative mass-metallicity relationship. gradient both red subpopulations, with each group clusters becoming bluer at larger distances from similar strength but monotonic more significant clusters. On average, have ~10% than This average difference less typically observed early-type galaxies does match that measured literature M104, suggesting morphology inclination may affect size between However, scatter on large. identify 31 extended typical which we consider ultra-compact dwarf (UCD) Many these objects are fainter UCDs. While it likely number will be background contaminants, six UCD spectroscopically confirmed. To explore low-mass X-ray binaries system, our ACS Suprime-Cam detections to corresponding Chandra sources. 45 - matches, 16 among subpopulation 29 subpopulation. These X-ray/GC coincidence fractions most systems, probably due increased depth data compared previous studies systems.