@inproceedings{oai:jaxa.repo.nii.ac.jp:00038319,
 author = {大西, 浩次 and 細川, 瑞彦 and 福島, 登志夫 and Onishi, Koji and Hosokawa, Mizuhiko and Fukushima, Toshio},
 book = {VLBI技術による宇宙研究シンポジウム, Symposium on Space Research with VLBI Technology},
 month = {Mar},
 note = {The observed position of QSOs may vary due to the gravitational deflection by foreground objects. This effect is eminent in the direction of the Galactic Center. To measure the distance to the Galactic Center with the relative error of a few percent, in addition to the astrometric microlensing by individual stars in the Galaxy, the macro lens effect, the collective gravitational deflection by the core and the bulge of the Galaxy must be considered. This effect is important because it has a secular component. Its magnitude is 0.4 micro-as/yr in the case of internal motion of QSOs by the core and reaches 0.6 micro-as/yr in the case of the collective motion produced by both the core and the bulge. The measurement of these effects will provide valuable information on the density and mass function of the Galactic Center., 資料番号: AA0048096002},
 pages = {4--10},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {MACRO lens toward the Galactic Center: Secular component of apparent proper motion of QSOs induced by gravitational lens of the galaxy},
 year = {2005}
}