Zobrazeno 1 - 10
of 3 734
pro vyhledávání: '"Matthews, K"'
Publikováno v:
Journal of Instrumentation, vol 17, May 2022
A high sensitivity Cardiac SPECT system using curved crystals with pinhole collimation was proposed previously (Dey, IEEE TNS 2012, Bhusal et al, Med. Phys. 2019). Here, we hypothesize that a high curvature hemi-ellipsoid detector results in measurab
Externí odkaz:
http://arxiv.org/abs/2204.10771
Autor:
Jovanovic, N., Delorme, J. R., Bond, C. Z., Cetre, S., Mawet, D., Echeverri, D., Wallace, J. K., Bartos, R., Lilley, S., Ragland, S., Ruane, G., Wizinowich, P., Chun, M., Wang, J., Fitzgerald, M., Matthews, K., Pezzato, J., Calvin, B., Millar-Blanchaer, M., Martin, E. C., Wetherell, E., Wang, E., Jacobson, S., Warmbier, E., Lockhart, C., Hall, D., Jensen-Clem, R., McEwen, E.
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system enabling high contrast imaging and high-resolution spectroscopic characterization of giant exoplanets in the mid-infrared (2-5 microns). The KPIC inst
Externí odkaz:
http://arxiv.org/abs/1909.04541
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:
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:
Reggiani, M., Christiaens, V., Absil, O., Mawet, D., Huby, E., Choquet, E., Gonzalez, C. A. Gomez, Ruane, G., Femenia, B., Serabyn, E., Matthews, K., Barraza, M., Carlomagno, B., Defrère, D., Delacroix, C., Habraken, S., Jolivet, A., Karlsson, M., de Xivry, G. Orban, Piron, P., Surdej, J., Catalan, E. Vargas, Wertz, O.
Publikováno v:
A&A 611, A74 (2018)
Transition disks offer the extraordinary opportunity to look for newly born planets and investigate the early stages of planet formation. In this context we observed the Herbig A5 star MWC 758 with the L band vector vortex coronagraph installed in th
Externí odkaz:
http://arxiv.org/abs/1710.11393
Autor:
Hees, A., Ghez, A. M., Do, T., Lu, J. R., Morris, M. R., Becklin, E. E., Witzel, G., Boehle, A., Chappell, S., Chen, Z., Chu, D., Ciurlo, A., Dehghanfar, A., Gallego-Cano, E., Gautam, A., Jia, S., Kosmo, K., Martinez, G. D., Matthews, K., Naoz, S., Sakai, S., Schödel, R.
Motion of short-period stars orbiting the supermassive black hole in our Galactic Center has been monitored for more than 20 years. These observations are currently offering a new way to test the gravitational theory in an unexplored regime: in a str
Externí odkaz:
http://arxiv.org/abs/1705.10792
Autor:
Hees, A., Do, T., Ghez, A. M., Martinez, G. D., Naoz, S., Becklin, E. E., Boehle, A., Chappell, S., Chu, D., Dehghanfar, A., Kosmo, K., Lu, J. R., Matthews, K., Morris, M. R., Sakai, S., Schödel, R., Witzel, G.
Publikováno v:
Phys. Rev. Letters 118, 211101, 2017
In this Letter, we demonstrate that short-period stars orbiting around the supermassive black hole in our Galactic Center can successfully be used to probe the gravitational theory in a strong regime. We use 19 years of observations of the two best m
Externí odkaz:
http://arxiv.org/abs/1705.07902
Publikováno v:
International Journal for Academic Development; Sep2024, Vol. 29 Issue 3, p353-365, 13p
