Zobrazeno 1 - 10
of 227
pro vyhledávání: '"Andrea M. Ghez"'
Autor:
Abhimat K. Gautam, Tuan Do, Andrea M. Ghez, Devin S. Chu, Matthew W. Hosek Jr., Shoko Sakai, Smadar Naoz, Mark R. Morris, Anna Ciurlo, Zoë Haggard, Jessica R. Lu
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 2, p 164 (2024)
We present the first estimate of the intrinsic binary fraction of young stars across the central ≈0.4 pc surrounding the supermassive black hole (SMBH) at the Milky Way Galactic center (GC). This experiment searched for photometric variability in 1
Externí odkaz:
https://doaj.org/article/4ef7177a78ed44e399737a1e01103f3e
Autor:
Grant C. Weldon, Tuan Do, Gunther Witzel, Andrea M. Ghez, Abhimat K. Gautam, Eric E. Becklin, Mark R. Morris, Gregory D. Martinez, Shoko Sakai, Jessica R. Lu, Keith Matthews, Matthew W. Hosek Jr., Zoë Haggard
Publikováno v:
The Astrophysical Journal Letters, Vol 954, Iss 1, p L33 (2023)
Sgr A* is the variable electromagnetic source associated with accretion onto the Galactic center supermassive black hole. While the near-infrared (NIR) variability of Sgr A* was shown to be consistent over two decades, unprecedented activity in 2019
Externí odkaz:
https://doaj.org/article/5008823664f14417aa9362fcf5917073
Autor:
Clarissa R. Do Ó, Kelly K. O’Neil, Quinn M. Konopacky, Tuan Do, Gregory D. Martinez, Jean-Baptiste Ruffio, Andrea M. Ghez
Publikováno v:
The Astronomical Journal, Vol 166, Iss 2, p 48 (2023)
The eccentricity of a substellar companion is an important tracer of its formation history. Directly imaged companions often present poorly constrained eccentricities. A recently developed prior framework for orbit fitting called “observable-based
Externí odkaz:
https://doaj.org/article/de1ac44218f745f68442ad800d73959a
Autor:
Zhuo Chen, Tuan Do, Andrea M. Ghez, Matthew W. Hosek Jr., Anja Feldmeier-Krause, Devin S. Chu, Rory O. Bentley, Jessica R. Lu, Mark R. Morris
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 79 (2023)
We report the first star formation history study of the Milky Ways nuclear star cluster (NSC), which includes observational constraints from a large sample of stellar metallicity measurements. These metallicity measurements were obtained from recent
Externí odkaz:
https://doaj.org/article/c8209fb522634bdeb96531ad00760a77
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
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 2, p 136 (2023)
We present two decades of new high-angular-resolution near-infrared data from the W. M. Keck Observatory that reveal extreme evolution in X7, an elongated dust and gas feature, presently located half an arcsecond from the Galactic Center supermassive
Externí odkaz:
https://doaj.org/article/a18ceb2002754caea92e9029994775fd
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
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
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