期刊
Astrophysical Journal Letters
卷 810, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/810/2/L20
关键词
globular clusters: individual (NGC 6553); gravitational lensing: micro; infrared: stars; surveys
资金
- BASAL CATA Center for Astrophysics and Associated Technologies [PFB-06]
- Millennium Institute of Astrophysics MAS from the Ministry of Economy, Development, and Tourism through Programa Iniciativa Cientifica Milenio [ICM P07-021-F]
- FONDECYT [3130320, 3130552, 1130196, 1120741, 1141141, 11130630]
- CONICYT-PCHA Magster Nacional [2014/2015-22141509]
- Doctoral Scholarship FIB-UV
- CONICYT-Gemini [32120033]
- FIC-R Fund [30321072]
- CNPq/Brazil [310636/2013-2, 481468/2013-7]
- ESO Public Survey programme [179.B-2002]
We report the discovery of a large timescale candidate microlensing event of a bulge stellar source based on near-infrared observations with the VISTA Variables in the Via Lactea Survey (VVV). The new microlensing event is projected only 3.5 arcmin away from the center of the globular cluster NGC 6553. The source appears to be a bulge giant star with magnitude K-s = 13.52, based on the position in the color-magnitude diagram. The foreground lens may be located in the globular cluster, which has well-known parameters such as distance and proper motions. If the lens is a cluster member, we can directly estimate its mass simply following Paczynski which is a modified version of the more general case due to Refsdal. In that case, the lens would be a massive stellar remnant, with M = 1.5-3.5M(circle dot). If the blending fraction of the microlensing event appears to be small, and this lens would represent a good isolated black hole (BH) candidate, that would be the oldest BH known. Alternative explanations (with a larger blending fraction) also point to a massive stellar remnant if the lens is located in the Galactic disk and does not belong to the globular cluster.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据