Zobrazeno 1 - 10
of 403
pro vyhledávání: '"Ghez, A. M."'
Autor:
Haggard, Z., Ghez, A. M., Sakai, S., Gautam, A. K., Do, T., Lu, J. R., Hosek, M., Morris, M. R., Granados, S.
The Milky Way's central parsec is a highly extinguished region with a population of high-proper-motion stars. We have tracked 145 stars for $\sim$10 years at wavelengths between 1 and 4 microns to analyze extinction effects in color-magnitude space.
Externí odkaz:
http://arxiv.org/abs/2408.03467
Autor:
Gautam, Abhimat K., Do, Tuan, Ghez, Andrea M., Chu, Devin S., Hosek Jr., Matthew W., Sakai, Shoko, Naoz, Smadar, Morris, Mark R., Ciurlo, Anna, Haggard, Zoe, Lu, Jessica R.
We present the first estimate of the intrinsic binary fraction of young stars across the central $\approx$ 0.4 pc surrounding the supermassive black hole (SMBH) at the Milky Way Galactic center (GC). This experiment searched for photometric variabili
Externí odkaz:
http://arxiv.org/abs/2401.12555
Autor:
Weldon, Grant C., Do, Tuan, Witzel, Gunther, Ghez, Andrea M., Gautam, Abhimat K., Becklin, Eric E., Morris, Mark R., Martinez, Gregory D., Sakai, Shoko, Lu, Jessica R., Matthews, Keith, Hosek Jr., Matthew W., Haggard, Zoë
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:
http://arxiv.org/abs/2308.09749
Publikováno v:
Phys. Rev. D 108, L061301 (2023)
We suggest that "$G$ objects" recently discovered in the Galactic Center may be clouds of gas bound by the gravitational field of stellar-mass black holes produced in the interactions of sublunar primordial black holes with neutron stars. If dark mat
Externí odkaz:
http://arxiv.org/abs/2308.08623
Autor:
Ó, Clarissa R. Do, O'Neil, Kelly K., Konopacky, Quinn M., Do, Tuan, Martinez, Gregory D., Ruffio, Jean-Baptiste, Ghez, Andrea M.
The eccentricity of a sub-stellar 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:
http://arxiv.org/abs/2306.04080
Autor:
Jia, Siyao, Xu, Ningyuan, Lu, Jessica R., Chu, D. S, O'Neil, K. Kosmo, Drechsler, W. B., Hosek Jr., M. W., Sakai, S., Do, T., Ciurlo, A., Gautam, A. K., Ghez, A. M., Becklin, E., Morris, M. R., Bentley, R. O.
We measure the 3D kinematic structures of the young stars within the central 0.5 parsec of our Galactic Center using the 10 m telescopes of the W.~M.~Keck Observatory over a time span of 25 years. Using high-precision measurements of positions on the
Externí odkaz:
http://arxiv.org/abs/2302.02040
Autor:
Ciurlo, Anna, Campbell, Randall D., Morris, Mark R., Do, Tuan, Ghez, Andrea M., Becklin, Eric E., Bentley, Rory O., Chu, Devin S., Gautam, Abhimat K., Gursahani, Yash A., Hees, Aurelien, O'Neil, Kelly Kosmo, Lu, Jessica R., Martinez, Gregory D., Naoz, Smadar, Sakai, Shoko, Schoedel, Rainer
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:
http://arxiv.org/abs/2301.06562
Autor:
Chen, Zhuo, Do, Tuan, Ghez, Andrea M., Hosek Jr., Matthew, Feldmeier-Krause, Anja, Chu, Devin, Bentley, Rory, Lu, Jessica R., Morris, Mark R.
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:
http://arxiv.org/abs/2212.01397
Autor:
Ciurlo, Anna, Turri, Paolo, Witzel, Gunther, Lu, Jessica R., Do, Tuan, Sitarski, Breann N., Fitzgerald, Michael P., Ghez, Andrea M., Alvarez, Carlos, Terry, Sean K., Doppmann, Greg, Lyke, James E., Ragland, Sam, Campbell, Randall, Matthews, Keith
Publikováno v:
Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 8, Issue 3, 038007 (September 2022)
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:
http://arxiv.org/abs/2210.10940
Autor:
Hosek Jr., Matthew W., Do, Tuan, Lu, Jessica R., Morris, Mark R., Ghez, Andrea M., Martinez, Gregory D., Anderson, Jay
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:
http://arxiv.org/abs/2208.08508