Zobrazeno 1 - 10
of 218
pro vyhledávání: '"Fassnacht, Christopher D."'
Autor:
Despali, Giulia, Heinze, Felix M., Fassnacht, Christopher D., Vegetti, Simona, Spingola, Cristiana, Klessen, Ralf
Strong gravitational lensing can detect the presence of low-mass haloes and subhaloes through their effect on the surface brightness of lensed arcs. We carry out an extended analysis of the density profiles and mass distributions of two detected subh
Externí odkaz:
http://arxiv.org/abs/2407.12910
Autor:
Wong, Kenneth C., Dux, Frédéric, Shajib, Anowar J., Suyu, Sherry H., Millon, Martin, Mozumdar, Pritom, Wells, Patrick R., Agnello, Adriano, Birrer, Simon, Buckley-Geer, Elizabeth J., Courbin, Frédéric, Fassnacht, Christopher D., Frieman, Joshua, Galan, Aymeric, Lin, Huan, Marshall, Philip J., Poh, Jason, Schuldt, Stefan, Sluse, Dominique, Treu, Tommaso
Publikováno v:
A&A 689, A168 (2024)
Time-delay cosmography is a powerful technique to constrain cosmological parameters, particularly the Hubble constant ($H_{0}$). The TDCOSMO collaboration is performing an ongoing analysis of lensed quasars to constrain cosmology using this method. I
Externí odkaz:
http://arxiv.org/abs/2406.02683
Publikováno v:
A&A 689, A87 (2024)
Time-Delay Cosmography is a technique for measuring $H_0$ with strong gravitational lensing. It requires a correction for line of sight perturbations, and it is necessary to build tools to assess populations of these lines of sight efficiently. We ai
Externí odkaz:
http://arxiv.org/abs/2403.10666
The flux ratios of strongly lensed quasars have previously been used to infer the properties of dark matter. In these analyses it is crucial to separate the effect of the main lensing galaxy and the low-mass dark matter halo population. In this work,
Externí odkaz:
http://arxiv.org/abs/2403.08895
Publikováno v:
A&A 676, A95 (2023)
Time-delay cosmography uses strong gravitational lensing of a time-variable source to infer the Hubble Constant. The measurement is independent from both traditional distance ladder and CMB measurements. An accurate measurement with this technique re
Externí odkaz:
http://arxiv.org/abs/2302.03176
Autor:
Hezaveh, Yashar D., Dalal, Neal, Marrone, Daniel P., Mao, Yao-Yuan, Morningstar, Warren, Wen, Di, Blandford, Roger D., Carlstrom, John E., Fassnacht, Christopher D., Holder, Gilbert P., Kemball, Athol, Marshall, Philip J., Murray, Norman, Levasseur, Laurence Perreault, Vieira, Joaquin D., Wechsler, Risa H.
We study the abundance of substructure in the matter density near galaxies using ALMA Science Verification observations of the strong lensing system SDP. 81. We present a method to measure the abundance of subhalos around galaxies using interferometr
Externí odkaz:
http://hdl.handle.net/10150/621261
http://arizona.openrepository.com/arizona/handle/10150/621261
http://arizona.openrepository.com/arizona/handle/10150/621261
Autor:
Shajib, Anowar J., Mozumdar, Pritom, Chen, Geoff C. -F., Treu, Tommaso, Cappellari, Michele, Knabel, Shawn, Suyu, Sherry H., Bennert, Vardha N., Frieman, Joshua A., Sluse, Dominique, Birrer, Simon, Courbin, Frederic, Fassnacht, Christopher D., Villafaña, Lizvette, Williams, Peter R.
Publikováno v:
A&A 673, A9 (2023)
Strong-lensing time delays enable measurement of the Hubble constant ($H_{0}$) independently of other traditional methods. The main limitation to the precision of time-delay cosmography is mass-sheet degeneracy (MSD). Some of the previous TDCOSMO ana
Externí odkaz:
http://arxiv.org/abs/2301.02656
Autor:
Powell, Devon M., Vegetti, Simona, McKean, J. P., Spingola, Cristiana, Stacey, Hannah R., Fassnacht, Christopher D.
We investigate the mass structure of a strong gravitational lens galaxy at $z=0.350$, taking advantage of the milli-arcsecond (mas) angular resolution of very long baseline interferometric (VLBI) observations. In the first analysis of its kind at thi
Externí odkaz:
http://arxiv.org/abs/2207.03375
Autor:
Despali, Giulia, Vegetti, Simona, White, Simon D. M., Powell, Devon M., Stacey, Hannah R., Fassnacht, Christopher D., Rizzo, Francesca, Enzi, Wolfgang
This paper aims to quantify how the lowest halo mass that can be detected with galaxy-galaxy strong gravitational lensing depends on the quality of the observations and the characteristics of the observed lens systems. Using simulated data, we measur
Externí odkaz:
http://arxiv.org/abs/2111.08718
Autor:
Chen, Geoff C. -F., Fassnacht, Christopher D., Suyu, Sherry H., Koopmans, Léon V. E., Lagattuta, David J., McKean, John P., Auger, Matt W., Vegetti, Simona, Treu, Tommaso
Strongly lensed quasars can provide measurements of the Hubble constant ($H_{0}$) independent of any other methods. One of the key ingredients is exquisite high-resolution imaging data, such as Hubble Space Telescope (HST) imaging and adaptive-optics
Externí odkaz:
http://arxiv.org/abs/2107.10304