| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
28 March 2024 |
|
| | | |
|
Article overview
| |
|
Detection of weak lensing by a cluster of galaxies at z=0.83 | G. A. Luppino
; Nick Kaiser
; | Date: |
31 Dec 1995 | Subject: | astro-ph | Affiliation: | University of Hawaii, Institute for Astronomy) and Nick Kaiser (CITA | Abstract: | We report the detection of weak gravitational lensing of faint, distant background galaxies by the rich, X-ray luminous cluster of galaxies MS1054-03 at z=0.83. This is the first measurement of weak lensing by a bona fide cluster at such a high redshift. We detect tangential shear at the 5% - 10% level over a range of radii 50’’ < r < 250’’ centered on the optical position of the cluster. Two-dimensional mass reconstruction using galaxies with 21.5 < I < 25.5 shows a strong peak which coincides with the peak of the smoothed cluster light distribution. Splitting this sample by magnitude (at I = 23.5) and color (at R-I = 0.7), we find that the brighter and redder subsamples are only very weakly distorted, indicating that the faint blue galaxies (FBG’s), which dominate the shear signal, are relatively more distant. The derived cluster mass is quite sensitive to the N(z) for the FBG’s. At one extreme, if all the FBG’s are at z_s = 3, then the mass within a $0.5h^{-1}$Mpc aperture is $(5.9 pm 1.24) imes 10^{14}$h1 $M_odot$, and the mass-to-light ratio is $M/L_V = 350 pm 70 h$ in solar units. For $z_s = 1.5$ the derived mass is $sim$70 higher and $M/L simeq 580 h$. If $N(z)$ follows the no evolution model (in shape) then $M/L simeq 800h$, and if all the FBG’s lie at $z_sla 1$ the required $M/L$ exceeds $1600h$. These data provide clear evidence that large, dense mass concentrations existed at early epochs; that they can be weighed efficiently by weak lensing observations; and that most of the FBG’s are at high redshift. | Source: | arXiv, astro-ph/9601194 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |