| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism | A. M. Nierenberg
; T. Treu
; G. Brammer
; A. H. G. Peter
; C. D. Fassnacht
; C. R. Keeton
; C. S. Kochanek
; K. B. Schmidt
; D. Sluse
; S. A. Wright
; | Date: |
18 Jan 2017 | Abstract: | Strong gravitational lensing provides a powerful test of Cold Dark Matter
(CDM) as it enables the detection and mass measurement of low mass haloes even
if they do not contain baryons. Compact lensed sources such as Active Galactic
Nuclei (AGN) are particularly sensitive to perturbing subhalos, but their use
as a test of CDM has been limited by the small number of systems which have
significant radio emission. Radio emission is extended enough avoid significant
lensing by stars in the plane of the lens galaxy, and red enough to be
minimally affected by differential dust extinction. Narrow-line emission is a
promising alternative as it is also extended and, unlike radio, detectable in
virtually all optically selected AGN lenses. We present first results from a
WFC3 grism narrow-line survey of lensed quasars, for the quadruply lensed AGN
HE0435-1223. Using a forward modelling pipeline which enables us to robustly
account for blending between nearby images and the main lens galaxy, we measure
the [OIII] 5007 AA$~$ flux ratios of the four lensed quasar images. We find
that the lensed [OIII] fluxes and positions are well fit by a simple smooth
mass model for the main lens. Our data rule out a $>10^{8} (10^{7.2})
M_{600}/M_odot$ NFW perturber within $sim$1."0 (0."1) arcseconds of the
lensed images, where $M_{600}$ is the perturber mass within its central 600 pc.
The non-detection is broadly consistent with the expectations of $Lambda$CDM
for a single system. The sensitivity achieved demonstrates that powerful limits
on the nature of dark matter can be obtained with the analysis of the entire
sample of narrow-line lenses. | Source: | arXiv, 1701.5188 | 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:
| |