Loading...
Search for:
fakhimghanbarzadeh--b
0.053 seconds
Total 3062 records
Pathway to the galactic distribution of planets: Combined Spitzer and ground-based Microlens parallax measurements of 21 single-lens events
, Article Astrophysical Journal ; Volume 804, Issue 1 , 2015 ; 0004637X (ISSN) ; Gould, A ; Udalski, A ; Menzies, J. W ; Bond, I. A ; Shvartzvald, Y ; Street, R. A ; Hundertmark, M ; Beichman, C. A ; Yee, J. C ; Carey, S ; Poleski, R ; Skowron, J ; Kozłowski, S ; Mróz, P ; Pietrukowicz, P ; Pietrzyński, G ; Szymański, M. K ; Soszyński, I ; Ulaczyk, K ; Wyrzykowski, Ł ; Albrow, M ; Beaulieu, J. P ; Caldwell, J. A. R ; Cassan, A ; Coutures, C ; Danielski, C ; Prester, D. D ; Donatowicz, J ; Lončarić, K ; McDougall, A ; Morales, J. C ; Ranc, C ; Zhu, W ; Abe, F ; Barry, R. K ; Bennett, D. P ; Bhattacharya, A ; Fukunaga, D ; Inayama, K ; Koshimoto, N ; Namba, S ; Sumi, T ; Suzuki, D ; Tristram, P. J ; Wakiyama, Y ; Yonehara, A ; Maoz, D ; Kaspi, S ; Friedmann, M ; Bachelet, E ; Jaimes, R. F ; Bramich, D. M ; Tsapras, Y ; Horne, K ; Snodgrass, C ; Wambsganss, J ; Steele, I. A ; Kains, N ; Bozza, V ; Dominik, M ; JØrgensen, U. G ; Alsubai, K. A ; Ciceri, S ; D'Ago, G ; HaugbØlle, T ; Hessman, F. V ; Hinse, T. C ; Juncher, D ; Korhonen, H ; Mancini, L ; Popovas, A ; Rabus, M ; Rahvar, S ; Scarpetta, G ; Schmidt, R. W ; Skottfelt, J ; Southworth, J ; Starkey, D ; Surdej, J ; Wertz, O ; Zarucki, M ; Gaudi, B. S ; Pogge, R. W ; Depoy, D. L ; Sharif University of Technology
Institute of Physics Publishing
2015
Abstract
We present microlens parallax measurements for 21 (apparently) isolated lenses observed toward the Galactic bulge that were imaged simultaneously from Earth and Spitzer, which was ∼1 AU west of Earth in projection. We combine these measurements with a kinematic model of the Galaxy to derive distance estimates for each lens, with error bars that are small compared to the Sun's galactocentric distance. The ensemble therefore yields a well-defined cumulative distribution of lens distances. In principle, it is possible to compare this distribution against a set of planets detected in the same experiment in order to measure the Galactic distribution of planets. Since these Spitzer observations...
An isolated stellar-mass black hole detected through astrometric microlensing
, Article Astrophysical Journal ; Volume 933, Issue 1 , 2022 ; 0004637X (ISSN) ; Anderson, J ; Casertano, S ; Bond, H.E ; Udalski, A ; Dominik, M ; Calamida, A ; Bellini, A ; Brown, T. M ; Rejkuba, M ; Bajaj, V ; Kains, N ; Ferguson, H. C ; Fryer, C.L ; Yock, P ; Mróz, P ; Kozłowski, S ; Pietrukowicz, P ; Poleski, R ; Skowron, J ; Soszyński, I ; Szymański, M. K ; Ulaczyk, K ; Wyrzykowski, L ; Barry, R. K ; Bennett, D. P ; Bond, I. A ; Hirao, Y ; Silva, S. I ; Kondo, I ; Koshimoto, N ; Ranc, C ; Rattenbury, N. J ; Sumi, T ; Suzuki, D ; Tristram, P. J ; Vandorou, A ; Beaulieu, J.-P ; Marquette, J.-B ; Cole, A ; Fouqué, P ; Hill, K ; Dieters, S ; Coutures, C ; Dominis-Prester, D ; Bennett, C ; Bachelet, E ; Menzies, J ; Albrow, M ; Pollard, K ; Gould, A ; Yee, J. C ; Allen, W ; Almeida, L. A ; Christie, G ; Drummond, J ; Gal-Yam, A ; Gorbikov, E ; Jablonski, F ; Lee, C.-U ; Maoz, D ; Manulis, I ; McCormick, J ; Natusch, T ; Pogge, R. W ; Shvartzvald, Y ; Jørgensen, U. G ; Alsubai, K. A ; Andersen, M. I ; Bozza, V ; Novati, S. C ; Burgdorf, M ; Hinse, T. C ; Hundertmark, M ; Husser, T.-O ; Kerins, E ; Longa-Peña, P ; Mancini, L ; Penny, M ; Rahvar, S ; Ricci, D ; Sajadian, S ; Skottfelt, J ; Snodgrass, C ; Southworth, J ; Tregloan-Reed, J ; Wambsganss, J ; Wertz, O ; Tsapras, Y ; Street, R. A ; Bramich, D.M ; Horne, K ; Steele, I. A ; Sahu, K. C ; Sharif University of Technology
Institute of Physics
2022
Abstract
We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in the direction of the Galactic bulge. HST imaging, conducted at eight epochs over an interval of 6 yr, reveals a clear relativistic astrometric deflection of the background star's apparent position. Ground-based photometry of MOA-11-191/OGLE-11-462 shows a parallactic signature of the effect of Earth's motion on the microlensing...