TY - JOUR
T1 - The first confirmed microlens in a globular cluster
AU - Pietrukowicz, P.
AU - Minniti, D.
AU - Jetzer, Ph
AU - Alonso-García, J.
AU - Udalski, A.
PY - 2012/1/10
Y1 - 2012/1/10
N2 - In 2000July/August a microlensing event occurred at a distance of 233 from the center of the globular cluster M22 (NGC 6656), observed against the dense stellar field of the Milky Way bulge. We have used the adaptive optics system NACO at the ESO Very Large Telescope to resolve the two objects that participated in the event: the lens and the source. The position of the objects measured in 2011July is in agreement with the observed relative proper motion of M22 with respect to the background bulge stars. Based on the brightness of the microlens components we find that the source is a solar-type star located at a distance of 6.0 1.5 kpc in the bulge, while the lens is a 0.18 0.01 M ⊙ dwarf member of the globular cluster located at the known distance of 3.2 0.2 kpc from the Sun.
AB - In 2000July/August a microlensing event occurred at a distance of 233 from the center of the globular cluster M22 (NGC 6656), observed against the dense stellar field of the Milky Way bulge. We have used the adaptive optics system NACO at the ESO Very Large Telescope to resolve the two objects that participated in the event: the lens and the source. The position of the objects measured in 2011July is in agreement with the observed relative proper motion of M22 with respect to the background bulge stars. Based on the brightness of the microlens components we find that the source is a solar-type star located at a distance of 6.0 1.5 kpc in the bulge, while the lens is a 0.18 0.01 M ⊙ dwarf member of the globular cluster located at the known distance of 3.2 0.2 kpc from the Sun.
KW - globular clusters: individual (M22)
KW - gravitational lensing: micro
KW - instrumentation: adaptive optics
UR - http://www.scopus.com/inward/record.url?scp=84555195794&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/744/2/L18
DO - 10.1088/2041-8205/744/2/L18
M3 - Article
AN - SCOPUS:84555195794
SN - 2041-8205
VL - 744
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L18
ER -