2 papers
astro-ph.SR2018
A search for black hole microlensing signatures in globular cluster NGC 6656 (M 22)
N. Kains, A. Calamida, K. C. Sahu +3
We report the results of a study aiming to detect signs of astrometric microlensing caused by an intermediate-mass black hole (IMBH) in the center of globular cluster M 22 (NGC 665…
astro-ph.SR2018
A High-Precision Trigonometric Parallax to an Ancient Metal-Poor Globular Cluster
T. M. Brown, S. Casertano, J. Strader +5
Using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST), we have obtained a direct trigonometric parallax for the nearest metal-poor globular cluster, NGC 6397. Al…