A Wide-Field Hubble Space Telescope Study of the Cluster Cl 0024+16 at z = 0.4. I. Morphological Distributions to 5 Mpc Radius
- T. Treu, R. Ellis, P. Natarajan
- Physics
- 12 March 2003
We describe a new wide-field Hubble Space Telescope survey of the galaxy cluster Cl 0024+16 (z ≈ 0.4) consisting of a sparsely sampled mosaic of 39 Wide Field Planetary Camera 2 images that extends…
The Frontier Fields: Survey Design and Initial Results
- J. Lotz, A. Koekemoer, M. Mountain
- Physics, Geology
- 21 May 2016
What are the faintest distant galaxies we can see with the Hubble Space Telescope (HST) now, before the launch of the James Webb Space Telescope? This is the challenge taken up by the Frontier…
Combined strong and weak lensing analysis of 28 clusters from the Sloan Giant Arcs Survey
- M. Oguri, M. Bayliss, B. Koester
- Physics
- 12 September 2011
We study the mass distribution of a sample of 28 galaxy clusters using strong and weak lensing observations. The clusters are selected via their strong lensing properties as part of the Sloan Giant…
Combining Strong and Weak Gravitational Lensing in Abell 1689
- M. Limousin, J. Richard, K. Knudsen
- Physics
- 6 December 2006
We present a reconstruction of the mass distribution of galaxy cluster Abell 1689 at z = 0.18 using detected strong lensing features from deep ACS observations and extensive ground based…
Accretion during the Merger of Supermassive Black Holes
- P. Armitage, P. Natarajan
- Physics
- 18 January 2002
We study the evolution of disk accretion during the merger of supermassive black hole binaries in galactic nuclei. In hierarchical galaxy formation models, the most common binaries are likely to…
Spin-induced Galaxy Alignments and Their Implications for Weak-Lensing Measurements
- R. Crittenden, P. Natarajan, U. Pen, T. Theuns
- Physics
- 4 September 2000
Large-scale correlations in the orientations of galaxies can result from alignments in their angular momentum vectors. These alignments arise from the tidal torques exerted on neighboring…
Mass and magnification maps for the Hubble Space Telescope Frontier Fields clusters: implications for high-redshift studies
- J. Richard, M. Jauzac, R. Bower
- Physics, Geology
- 11 October 2014
Extending over three Hubble Space Telescope (HST) cycles, the Hubble Frontier Fields (HFF) initiative constitutes the largest commitment ever of HST time to the exploration of the distant Universe…
Discriminating Weak Lensing from Intrinsic Spin Correlations Using the Curl-Gradient Decomposition
- R. Crittenden, P. Natarajan, U. Pen, T. Theuns
- Physics
- 15 December 2000
The distortion field defined by the ellipticities of galaxy shapes as projected on the sky can be uniquely decomposed into a gradient and a curl component. If the observed ellipticities are induced…
First Stars, Very Massive Black Holes, and Metals
- R. Schneider, A. Ferrara, P. Natarajan, K. Omukai
- Physics
- 17 November 2001
Recent studies suggest that the initial mass function (IMF) of the first stars (Population III) is likely to have been extremely top-heavy, unlike what is observed at present. We propose a scenario…
A Mean Redshift of 2.8 for Swift gamma - ray bursts
- P. Jakobsson, A. Levan, S. Sousa
- Physics
- 29 September 2005
The high mean redshift of GRBs and their wide redshift range clearly demonstrates their suitability as efficient probes of galaxies and the intergalactic medium over a significant fraction of the history of the Universe.
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