Zobrazeno 1 - 10
of 5 706
pro vyhledávání: '"Ghez P."'
Autor:
Paugnat, Hadrien, Do, Tuan, Gautam, Abhimat K., Martinez, Gregory D., Ghez, Andrea M., Sakai, Shoko, Weldon, Grant C., Hosek Jr., Matthew W., Haggard, Zoë, O'Neil, Kelly Kosmo, Becklin, Eric E., Witzel, Gunther, Lu, Jessica R., Matthews, Keith
In this work, we measure the spectral index of Sagittarius A* (Sgr A*) between the $H$ (1.6 $\mu$m) and $K^\prime$ (2.2 $\mu$m) broadband filters in the near-infrared (NIR), sampling over a factor $\sim 40$ in brightness, the largest range probed to
Externí odkaz:
http://arxiv.org/abs/2411.11966
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:
Schoedel, Rainer, Longmore, Steve, Henshaw, Jonny, Ginsburg, Adam, Bally, John, Feldmeier, Anja, Hosek, Matt, Lara, Francisco Nogueras, Ciurlo, Anna, Chevance, Mélanie, Kruijssen, J. M. Diederik, Klessen, Ralf, Ponti, Gabriele, Amaro-Seoane, Pau, Anastasopoulou, Konstantina, Anderson, Jay, Arias, Maria, Barnes, Ashley T., Battersby, Cara, Bono, Giuseppe, Ferres, Lucía Bravo, Bryant, Aaron, Gonzáalez, Miguel Cano, Cassisi, Santi, Chaves-Velasquez, Leonardo, Conte, Francesco, Ramos, Rodrigo Contreras, Cotera, Angela, Crowe, Samuel, di Teodoro, Enrico, Do, Tuan, Eisenhauer, Frank, Enokiya, Rei, Fedriani, Rubén, Friske, Jennifer K. S., Gadotti, Dimitri, Gallart, Carme, Calvente, Teresa Gallego, Cano, Eulalia Gallego, Fuentes, Pablo García, Marín, Macarena García, Gardini, Angela, Gautam, Abhimat K., Ghez, Andrea, Gillessen, Stefan, Gouda, Naoteru, Gualandris, Alessia, Guarcello, Mario Giuseppe, Gutermuth, Robert, Haggard, Daryl, Hankins, Matthew, Hu, Yue, Kano, Ryohei, Kauffmann, Jens, Lau, Ryan, Lazarian, Alexandre, Libralato, Mattia, Lu, Anan, Lu, Xing, Lu, Jessica R., Luetzgendorf, Nora, Magorrian, John, Mandel, Shifra, Markoff, Sera, Arranz, Álvaro Martínez, Mastrobuono-Battisti, Alessandra, Melamed, Maria, Mills, Elisabeth, Mori, Kaya, Morris, Mark, Murchikova, Elena, Nagata, Tetsuya, Najarro, Francisco, Nandakumar, Govind, Nataf, David, Neumayer, Nadine, Nishiyama, Shogo, Nobukawa, Masayoshi, Paré, Dylan M, Peissker, Florian, Petkova, Maya, Pillai, Thushara G. S., Román, Mike Rich Carlos, Rugel, Michael, Ryde, Nils, Sabha, Nadeen, Bermúdez, Joel Sánchez, Sánchez-Monge, Álvaro, Schultheis, Mathias, Shao, Lijing, Shinnaga, Hiroko, Simpson, Janet, Takekawa, Shunya, Tan, Jonathan C., Thorsbro, Brian, Torne, Pablo, Tress, Robin Goppala, Uchiyam, Hideki, Valenti, Elena, van der Marel, Roeland, Verberne, Sill, Vermot, Pierre, von Fellenberg, Sebastiano, Walker, Daniel, Witzel, Gunther, Xu, Siyao, Yano, Taihei, Yusef-Zadeh, Farhad, Zajaček, Michal, Zoccali, Manuela
The inner hundred parsecs of the Milky Way hosts the nearest supermassive black hole, largest reservoir of dense gas, greatest stellar density, hundreds of massive main and post main sequence stars, and the highest volume density of supernovae in the
Externí odkaz:
http://arxiv.org/abs/2310.11912
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
Infrared observations of stellar orbits about Sgr A* probe the mass distribution in the inner parsec of the Galaxy and provide definitive evidence for the existence of a massive black hole. However, the infrared astrometry is relative and is tied to
Externí odkaz:
http://arxiv.org/abs/2308.03147
Autor:
Will, Clifford M., Naoz, Smadar, Hees, Aurélien, Tucker, Alexandria, Zhang, Eric, Do, Tuan, Ghez, Andrea
Publikováno v:
Astrophys. J. 959, 58 (2023)
We use 23 years of astrometric and radial velocity data on the orbit of the star S0-2 to constrain a hypothetical intermediate-mass black hole orbiting the massive black hole Sgr A* at the Galactic center. The data place upper limits on variations of
Externí odkaz:
http://arxiv.org/abs/2307.16646
Autor:
Terry, Sean K., Hosek Jr., Matthew W., Lu, Jessica R., Lam, Casey, Abrams, Natasha, Bahramian, Arash, Barry, Richard, Beaulieu, Jean-Phillipe, Bhattacharya, Aparna, Chu, Devin, Ciurlo, Anna, Clarkson, Will, Do, Tuan, El-Badry, Kareem, Felton, Ryan, Freeman, Matthew, Gautam, Abhimat, Ghez, Andrea, Huber, Daniel, Hunt, Jason, Huston, Macy, Jayasinghe, Tharindu, Koshimoto, Naoki, Lucey, Madeline, Peißker, Florian, Pusack, Anna, Ranc, Clément, Rowan, Dominick, Sanderson, Robyn, Schödel, Rainer, Spencer, Richard G., Street, Rachel, Suzuki, Daisuke, Vandorou, Aikaterini
We advocate for a Galactic center (GC) field to be added to the Galactic Bulge Time Domain Survey (GBTDS). The new field would yield high-cadence photometric and astrometric measurements of an unprecedented ${\sim}$3.3 million stars toward the GC. Th
Externí odkaz:
http://arxiv.org/abs/2306.12485
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