|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
18 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Keck spectroscopy of CLASS gravitational lenses | | J.P McKean
; L.V.E. Koopmans
; I.W.A. Browne
; C.D. Fassnacht
; R.D. Blandford
; L.M. Lubin
; A.C.S. Readhead
; | | Date: |
4 Feb 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 350 (2004) 167 | | Subject: | astro-ph | | Affiliation: | 1, 2), L.V.E. Koopmans (3, 4), I.W.A. Browne , C.D. Fassnacht , R.D. Blandford , L.M. Lubin , A.C.S. Readhead ( JBO, UC Davis, Caltech, STScI, KIPAC | | Abstract: | We present the optical spectra of four newly discovered gravitational lenses from the Cosmic Lens All-Sky Survey (CLASS). These observations were carried out using the Low Resolution Imaging Spectrograph on the W. M. Keck-I Telescope as part of a program to study galaxy-scale gravitational lenses. From our spectra we found the redshift of the background source in CLASS B0128+437 (z_s=3.1240+-0.0042) and the lensing galaxy redshifts in CLASS B0445+123 (z_l=0.5583+-0.0003) and CLASS B0850+054 (z_l=0.5883+-0.0006). Intriguingly, we also discovered that CLASS B0631+519 may have two lensing galaxies (z_l,1=0.0896+-0.0001, z_l,2=0.6196+-0.0004). We also found a single unidentified emission line from the lensing galaxy in CLASS B0128+437 and the lensed source in CLASS B0850+054. We find the lensing galaxies in CLASS B0445+123 and CLASS B0631+519 (l,2) to be early-type galaxies with Einstein Radii of 2.8-3.0 h^{-1} kpc. The deflector in CLASS B0850+054 is a late-type galaxy with an Einstein Radius of 1.6 h^{-1} kpc. | | Source: | arXiv, astro-ph/0402116 | | 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:
| |
REGISTER