Zobrazeno 1 - 10
of 363
pro vyhledávání: '"Becklin, E"'
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:
Boyce, H., Haggard, D., Witzel, G., von Fellenberg, S., Willner, S. P., Becklin, E. E., Do, T., Eckart, A., Fazio, G. G., Gurwell, M. A., Hora, J. L., Markoff, S., Morris, M. R., Neilsen, J., Nowak, M., Smith, H. A., Zhang, S.
We report timing analysis of near-infrared (NIR), X-ray, and sub-millimeter (submm) data during a three-day coordinated campaign observing Sagittarius A*. Data were collected at 4.5 micron with the Spitzer Space Telescope, 2-8 keV with the Chandra X-
Externí odkaz:
http://arxiv.org/abs/2203.13311
Autor:
Witzel, G., Martinez, G., Willner, S. P., Becklin, E. E., Boyce, 4 H., Do, T., Eckart, A., Fazio, G. G., Ghez, A., Gurwell, M. A., Haggard, D., Herrero-Illana, R., Hora, J. L., Li, Z., Liu, J., Marchili, N., Morris, Mark R., Smith, Howard A., Subroweit, M., Zensus, J. A.
Sagittarius A* (Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source associated with accretion onto the Galactic center black hole. We have analyzed a comprehensive submillimeter (including new observations simultaneous with NIR monit
Externí odkaz:
http://arxiv.org/abs/2011.09582
Autor:
Smith, Erin C., Logsdon, Sarah E., McLean, Ian S., Fletcher, Elizabeth, Vacca, William D., Becklin, E. E., Shenoy, Sachindev, Savage, Maureen, Hamilton, Ryan T.
Here we present the results of an airborne 3-5.4$\mu$m spectroscopic study of three young, Carbon-rich planetary nebulae IC 5117, PNG 093.9-00.1, and BD $+$30 3639. These observations were made using the grism spectroscopy mode of the FLITECAM instru
Externí odkaz:
http://arxiv.org/abs/2008.13635
Autor:
Chen, Zhuo, Gallego-Cano, E., Do, T., Witzel, G., Ghez, A. M., Schödel, R., Sitarski, B. N., Becklin, E. E., Lu, J., Morris, M. R., Dehghanfar, A., Gautam, A. K., Hees, A., Hosek Jr, M. W., Jia, S., Mangian, A. C., Matthews, K.
We report new infrared measurements of the supermassive black hole at the Galactic Center, Sgr A*, over a decade that was previously inaccessible at these wavelengths. This enables a variability study that addresses variability timescales that are te
Externí odkaz:
http://arxiv.org/abs/1908.08066
Autor:
Jia, Siyao, Lu, Jessica R., Sakai, S ., Gautam, A. K., Do, T., Hosek Jr., M. W., Service, M., Ghez, A. M., Gallego-Cano, E., Schodel, R., Hees, Aurelien, Morris, M. R., Becklin, E., Matthews, K.
We present improved relative astrometry for stars within the central half parsec of our Galactic Center based on data obtained with the 10 m W. M. Keck Observatory from 1995 to 2017. The new methods used to improve the astrometric precision and accur
Externí odkaz:
http://arxiv.org/abs/1902.02491
Autor:
Sakai, Shoko, Lu, Jessica R., Ghez, Andrea, Jia, Siyao, Do, Tuan, Witzel, Gunther, Gautam, Abhimat K., Hees, Aurelien, Becklin, E., Matthews, K., Hosek Jr, M. W.
Precision measurements of the stars in short-period orbits around the supermassive black hole at the Galactic Center are now being used to constrain general relativistic effects, such as the gravitational redshift and periapse precession. One of the
Externí odkaz:
http://arxiv.org/abs/1901.08685
Autor:
Boyce, H., Haggard, D., Witzel, G., Willner, S. P., Neilsen, J., Hora, J. L., Markoff, S., Ponti, G., Baganoff, F., Becklin, E., Fazio, G., Lowrance, P., Morris, M. R., Smith, H. A.
Emission from Sgr A* is highly variable at both X-ray and infrared (IR) wavelengths. Observations over the last ~20 years have revealed X-ray flares that rise above a quiescent thermal background about once per day, while faint X-ray flares from Sgr
Externí odkaz:
http://arxiv.org/abs/1812.05764
Autor:
O'Neil, K. Kosmo, Martinez, G. D., Hees, A., Ghez, A. M., Do, T., Witzel, G., Konopacky, Q., Becklin, E. E., Chu, D. S., Lu, J., Matthews, K., Sakai, S.
Publikováno v:
AJ, 158, 4 (2019)
We propose a new approach to Bayesian prior probability distributions (priors) that can improve orbital solutions for low-phase-coverage orbits, where data cover less than approximately 40% of an orbit. In instances of low phase coverage such as with
Externí odkaz:
http://arxiv.org/abs/1809.05490
Autor:
Fazio, G. G., Hora, J. L., Witzel, G., Willner, S. P., Ashby, M. L. N., Baganoff, F., Becklin, E., Carey, S., Haggard, D., Gammie, C., Ghez, A., Gurwell, M. A., Ingalls, J., Marrone, D., Morris, M. R., Smith, H. A.
Sgr A*, the supermassive black hole (SMBH) at the center of our Milky Way Galaxy, is known to be a variable source of X-ray, near-infrared (NIR), and submillimeter (submm) radiation and therefore a prime candidate to study the electromagnetic radiati
Externí odkaz:
http://arxiv.org/abs/1807.07599