Zobrazeno 1 - 10
of 259
pro vyhledávání: '"A. M. Ghez"'
Autor:
Siyao Jia, Ningyuan Xu, Jessica R. Lu, D. S. Chu, K. Kosmo O’Neil, W. B. Drechsler, M. W. Hosek Jr., S. Sakai, T. Do, A. Ciurlo, A. K. Gautam, A. M. Ghez, E. Becklin, M. R. Morris, R. O. Bentley
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 18 (2023)
We measure the 3D kinematic structures of the young stars within the central 0.5 pc of our Galactic Center using the 10 m telescopes of the W. M. Keck Observatory over a time span of 25 yr. Using high-precision measurements of positions on the sky an
Externí odkaz:
https://doaj.org/article/a0e42b7dec214243a422826ae716123f
Autor:
Hadrien Paugnat, Tuan Do, Abhimat K. Gautam, Gregory D. Martinez, Andrea M. Ghez, Shoko Sakai, Grant C. Weldon, Matthew W. Hosek Jr., Zoë Haggard, Kelly Kosmo O’Neil, Eric E. Becklin, Gunther Witzel, Jessica R. Lu, Keith Matthews
Publikováno v:
The Astrophysical Journal, Vol 977, Iss 2, p 228 (2024)
In this work, we measure the spectral index of Sagittarius A* (Sgr A*) between the H (1.6 μ m) and $K^{\prime} $ (2.2 μ m) broadband filters in the near-infrared (NIR), sampling over a factor ∼40 in brightness, the largest range probed to date by
Externí odkaz:
https://doaj.org/article/f4a053e8546746fbbe66085c7dc7e5ea
Autor:
Anna Ciurlo, Randall D. Campbell, Mark R. Morris, Tuan Do, Andrea M. Ghez, Eric E. Becklin, Rory O. Bentley, Devin S. Chu, Abhimat K. Gautam, Yash A. Gursahani, Aurélien Hees, Kelly Kosmo O’Neil, Jessica R. Lu, Gregory D. Martinez, Smadar Naoz, Shoko Sakai, Rainer Schödel
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the origina
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8cc8e0ed31d12406ff5bafb27fc65127
Autor:
Zhuo Chen, Tuan Do, Andrea M. Ghez, Matthew W. Hosek, Anja Feldmeier-Krause, Devin S. Chu, Rory O. Bentley, Jessica R. Lu, Mark R. Morris
We report the first star formation history study of the Milky Way's nuclear star cluster (NSC) that includes observational constraints from a large sample of stellar metallicity measurements. These metallicity measurements were obtained from recent s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1065b7c7ab4e8cef467396fdff22104
http://arxiv.org/abs/2212.01397
http://arxiv.org/abs/2212.01397
Autor:
Anna Ciurlo, Paolo Turri, Gunther Witzel, Jessica R. Lu, Tuan Do, Breann N. Sitarski, Michael P. Fitzgerald, Andrea M. Ghez, Carlos Alvarez, Sean K. Terry, Greg Doppmann, James E. Lyke, Sam Ragland, Randall Campbell, Keith Matthews
Images obtained with single-conjugate adaptive optics (AO) show spatial variation of the point spread function (PSF) due to both atmospheric anisoplanatism and instrumental aberrations. The poor knowledge of the PSF across the field of view strongly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54c29c82e5c9efbd58bb2bb3dc515f25
http://arxiv.org/abs/2210.10940
http://arxiv.org/abs/2210.10940
Autor:
Paolo Turri, Jessica R. Lu, Gunther Witzel, Anna Ciurlo, Tuan Do, Andrea M. Ghez, Michael P. Fitzgerald, Matthew C. Britton, Sam Ragland, Sean K. Terry
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems. 8
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68e546723c8aec33d839560a612a8e99
https://doi.org/10.1117/1.jatis.8.3.039002
https://doi.org/10.1117/1.jatis.8.3.039002
Autor:
Bardia H. Fahim, A. M. Ghezelbash
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 8, Pp 1-14 (2024)
Abstract We construct new classes of the dynamical black hole solutions in five or higher dimensional Einstein–Maxwell theory, coupled to a dilaton field, in the presence of an arbitrary cosmological constant. The dilaton field interacts non-trivia
Externí odkaz:
https://doaj.org/article/64d88a84e6a842ed99655a284ad21c7a
Autor:
Jessica R. Lu, Emily Ramey, Matthew W. Hosek, Mark Morris, Abhimat K. Gautam, Keith Matthews, Siyao Jia, Shoko Sakai, Sam Ragland, Tuan Do, Eric E. Becklin, Andrea M. Ghez, Ruoyi Yin, Peter Wizinowich, Steve Robinson, James E. Lyke
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems. 8
We present an analysis of the long-term performance of the W. M. Keck observatory laser guide star adaptive optics (LGS-AO) system and explore factors that influence the overall AO performance most strongly. Astronomical surveys can take years or dec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::337647b112e27590395308ae951ac544
https://doi.org/10.1117/1.jatis.8.2.028004
https://doi.org/10.1117/1.jatis.8.2.028004
The Galactic Center black hole and the nuclear star cluster are surrounded by a clumpy ring of gas and dust (the circumnuclear disk, CND) that rotates about them at a standoff distance of ~1.5 pc. The mass and density of individual clumps in the CND
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0006ba820984bee9da5d2c9d510f0c0
http://arxiv.org/abs/2204.11539
http://arxiv.org/abs/2204.11539
Autor:
Matthew W. Hosek, Tuan Do, Jessica R. Lu, Mark R. Morris, Andrea M. Ghez, Gregory D. Martinez, Jay Anderson
Publikováno v:
The Astrophysical Journal. 939:68
We present new absolute proper motion measurements for the Arches and Quintuplet clusters, two young massive star clusters near the Galactic center. Using multi-epoch HST observations, we construct proper motion catalogs for the Arches ($\sim$35,000
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c506cb9af36d15f86897cfbb62f590c
https://doi.org/10.3847/1538-4357/ac8bd6
https://doi.org/10.3847/1538-4357/ac8bd6