Zobrazeno 1 - 10
of 139
pro vyhledávání: '"Keeton C"'
Autor:
Rivera, J., Baker, A. J., Gallardo, P. A., Gralla, M., Harris, A. I., Huffenberger, K. M., Hughes, J. P., Keeton, C. R., Lopez-Caraballo, C. H., Marriage, T. A., Partridge, B., Sievers, J., Tagore, A. S., Walter, F., Weiss, A., Wollack, E. J.
We report Northern Extended Millimeter Array (NOEMA) CO($J = 3 - 2$) observations of the dusty star-forming galaxy ACT-S\,J020941+001557 at $z = 2.5528$, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial s
Externí odkaz:
http://arxiv.org/abs/1807.08895
Autor:
Mao, S. A., Carilli, C., Gaensler, B. M., Wucknitz, O., Keeton, C., Basu, A., Beck, R., Kronberg, P. P., Zweibel, E.
Magnetic fields play a pivotal role in the physics of interstellar medium in galaxies, but there are few observational constraints on how they evolve across cosmic time. Spatially resolved synchrotron polarization maps at radio wavelengths reveal wel
Externí odkaz:
http://arxiv.org/abs/1708.07844
We report the serendipitous discovery of the first gravitationally lensed quasar candidate from Pan-STARRS. The grizy images reveal four point-like images with magnitudes between 14.9 mag and 18.1 mag. The colors of the point sources are similar, and
Externí odkaz:
http://arxiv.org/abs/1705.08359
Autor:
Nierenberg, A. M., Treu, T., Brammer, G., Peter, A. H. G., Fassnacht, C. D., Keeton, C. R., Kochanek, C. S., Schmidt, K. B., Sluse, D., Wright, S. A.
Strong gravitational lensing provides a powerful test of Cold Dark Matter (CDM) as it enables the detection and mass measurement of low mass haloes even if they do not contain baryons. Compact lensed sources such as Active Galactic Nuclei (AGN) are p
Externí odkaz:
http://arxiv.org/abs/1701.05188
Autor:
Treu, T., Marshall, P. J., Cyr-Racine, F. -Y., Fassnacht, C. D., Keeton, C. R., Linder, E. V., Moustakas, L. A., Bradac, M., Buckley-Geer, E., Collett, T., Courbin, F., Dobler, G., Finley, D. A., Hjorth, J., Kochanek, C. S., Komatsu, E., Koopmans, L. V. E., Meylan, G., Natarajan, P., Oguri, M., Suyu, S. H., Tewes, M., Wong, K. C., Zabludoff, A. I., Zaritsky, D., Anguita, T., Brunner, R. J., Cabanac, R., Falco, E. E., Fritz, A., Seidel, G., Howell, D. A., Giocoli, C., Jackson, N., Lopez, S., Metcalf, R. B., Motta, V., Verdugo, T.
Strong lensing gravitational time delays are a powerful and cost effective probe of dark energy. Recent studies have shown that a single lens can provide a distance measurement with 6-7 % accuracy (including random and systematic uncertainties), prov
Externí odkaz:
http://arxiv.org/abs/1306.1272
Publikováno v:
Astrophys.J.697:1793-1804,2009
Attempts to constrain the Hubble constant using the strong gravitational lens system Q0957+561 are limited by systematic uncertainties in the mass model, since the time delay is known very precisely. One important systematic effect is the mass sheet
Externí odkaz:
http://arxiv.org/abs/0903.4182
Autor:
Koopmans, L. V. E., Auger, M., Barnabe, M., Bolton, A., Bradac, M., Ciotti, L., Congdon, A., Czoske, O., Dye, S., Dutton, A., Eliasdottir, A., Evans, E., Fassnacht, C. D., Jackson, N., Keeton, C., Lazio, J., Marshall, P., Meneghetti, M., McKean, J., Moustakas, L., Myers, S., Nipoti, C., Suyu, S., van de Ven, G., Vegetti, S., Wambsganss, J., Webster, R., Wucknitz, O., Zhao, H-S
Whereas considerable effort has been afforded in understanding the properties of galaxies, a full physical picture, connecting their baryonic and dark-matter content, super-massive black holes, and (metric) theories of gravity, is still ill-defined.
Externí odkaz:
http://arxiv.org/abs/0902.3186
Autor:
Marshall, P. J., Auger, M., Bartlett, J. G., Bradac, M., Cooray, A., Dalal, N., Dobler, G., Fassnacht, C. D., Jain, B., Keeton, C. R., Mandelbaum, R., Moustakas, L. A., Strauss, M. A., Tyson, J. A., Wittman, D., Wright, S. A.
The Cold Dark Matter theory of gravitationally-driven hierarchical structure formation has earned its status as a paradigm by explaining the distribution of matter over large spans of cosmic distance and time. However, its central tenet, that most of
Externí odkaz:
http://arxiv.org/abs/0902.2963
We present evidence that the optically unidentified radio source, FIRST J121839.7+295325, may be strongly lensing a background galaxy. We estimate the redshift of the assumed gravitational arc, discovered in parallel imaging with HST, from MMT-Blue C
Externí odkaz:
http://arxiv.org/abs/0806.3781
Autor:
Virbhadra, K. S., Keeton, C. R.
Publikováno v:
Phys.Rev.D77:124014,2008
We model the massive dark object at the center of the Galaxy as a Schwarzschild black hole as well as Janis-Newman-Winicour naked singularities, characterized by the mass and scalar charge parameters, and study gravitational lensing (particularly tim
Externí odkaz:
http://arxiv.org/abs/0710.2333