Article (Scientific journals)
Probing dark matter substructure in the gravitational lens HE 0435‑1223 with the WFC3 grism
Nierenberg, A. M.; Treu, T.; Brammer, G. et al.
2017In Monthly Notices of the Royal Astronomical Society, 471, p. 2224-2236
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Originally published in MNRAS, https://academic.oup.com/mnras/article/471/2/2224/3862548


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Abstract :
[en] 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 which 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 spatial blending, we measure the [OIII] 5007 \AA~ flux ratios of the four images. We find that the [OIII] fluxes and positions are well fit by a simple smooth mass model for the main lens. Our data rule out a $M_{600}>10^{8} (10^{7.2}) M_\odot$ NFW perturber projected within $\sim$1\farcs0 (0\farcs1) arcseconds of each 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 $\sim20$ narrow-line lenses.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nierenberg, A. M.
Treu, T.
Brammer, G.
Peter, A. H. G.
Fassnacht, C. D.
Keeton, C. R.
Kochanek, C. S.
Schmidt, K. B.;  8Leibniz-Institut fuer Astrophysik Postdam
Sluse, Dominique  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Wright, S. A.
Language :
English
Title :
Probing dark matter substructure in the gravitational lens HE 0435‑1223 with the WFC3 grism
Publication date :
01 October 2017
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
471
Pages :
2224-2236
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 August 2017

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