Beyond the bulge-halo conspiracy? Density profiles of Early-type galaxies from extended-source strong lensing
Amy Etherington, James W. Nightingale, Richard Massey, Andrew Robertson, XiaoYue Cao, Aristeidis Amvrosiadis, Shaun Cole, Carlos S. Frenk, Qiuhan He, David J. L… 展开作者
Amy Etherington, James W. Nightingale, Richard Massey, Andrew Robertson, XiaoYue Cao, Aristeidis Amvrosiadis, Shaun Cole, Carlos S. Frenk, Qiuhan He, David J. Lagattuta, Samuel Lange, Ran Li
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14 pages, 11 figures, 5 tables, submitted to MNRAS
Observations suggest that the dark matter and stars in early-type galaxies `conspire' to produce a surprisingly simple distribution of total mass, $ρ(r)\proptoρ^{-γ}$, with $γ\approx2$. We measure the distribution of mass in 48 early-type galaxies that gravitationally lens a resolved background source. By fitting the source light in every pixel of images from the Hubble Space Telescope, we find a mean $\langleγ\rangle=2.075_{-0.024}^{+0.023}$ with intrinsic scatter between galaxies of $σ_γ=0.172^{+0.022}_{-0.032}$ for the overall sample. This is consistent with, and has similar precision to traditional techniques that employ spectroscopic observations to supplement lensing with mass estimates from stellar dynamics. Comparing measurements of $γ$ for individual lenses using both techniques, we find a statistically insignificant correlation of $-0.150^{+0.223}_{-0.217}$ between the two, indicating a lack of statistical power or deviations from a power-law density in certain lenses. At fixed surface mass density, we measure a redshift dependence, $\partial\langleγ\rangle/\partial z=0.345^{+0.322}_{-0.296}$, that is consistent with traditional techniques for the same sample of SLACS and GALLERY lenses. Interestingly, the consistency breaks down when we measure the dependence of $γ$ on the surface mass density of a lens galaxy. We argue that this is tentative evidence for an inflection point in the total-mass density profile at a few times the galaxy effective radius -- breaking the conspiracy.
Bulgeless disks, dark galaxies, inverted color gradients, and other expected phenomena at higher z. The chromatic surface brightness modulation (CMOD) effect
Measuring gravitational lensing time delays with quantum information processing
Joint Center for Quantum Information and Computer Science, NIST/University of Maryland（量子信息与计算机联合中心，美国国家标准与技术研究院/马里兰大学）；Department of Computer Science, University of Maryland（马里兰大学计算机科学系）；Maryland Center for Fundamental Physics, University of Maryland（马里兰基础物理中心，马里兰大学）；Department of Physics & Astronomy, The Johns Hopkins University（约翰斯·霍普金斯大学物理与天文学系）；Department of Physics & Astronomy, University of British Columbia（不列颠哥伦比亚大学物理与天文学系）；Joint Quantum Institute, NIST/University of Maryland（量子联合研究所，美国国家标准与技术研究院/马里兰大学）；Department of Physics, Massachusetts Institute of Technology（麻省理工学院物理系）；Institute for Advanced Computer Studies, University of Maryland（马里兰大学高级计算机研究所）
Self-lensing binaries as probes of Supernova physics
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（波兰科学院尼古拉·哥白尼天文学中心）；School of Physics & Astronomy, University of Southampton（南安普顿大学物理与天文学院）；Max Planck Institute for Astrophysics（马克斯·普朗克天体物理学研究所）；School of Mathematics, Statistics, and Physics, Newcastle University（纽卡斯尔大学数学、统计与物理学院）
The BAGLE Python Package for Bayesian Analysis of Gravitational Lensing Events
University of California, Berkeley（加州大学伯克利分校）；University of Maryland, College Park（马里兰大学帕克分校）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）
Hamilton's Object Revisited: A challenging source redshift of a strong lensing configuration
Academia Sinica Institute of Astronomy and Astrophysics（中央研究院天文及天文物理研究所）；Bahamas Advanced Study Institute and Conferences（巴哈马高级研究学会与会议）；Center for Astrophysics, Harvard & Smithsonian（哈佛史密森天体物理中心）
