%0 Generic %1 nierenberg2017probing %A Nierenberg, A. M. %A Treu, T. %A Brammer, G. %A Peter, A. H. G. %A Fassnacht, C. D. %A Keeton, C. R. %A Kochanek, C. S. %A Schmidt, K. B. %A Sluse, D. %A Wright, S. A. %D 2017 %K dark lense matter %T Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism %U http://arxiv.org/abs/1701.05188 %X 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 $>10^8 (10^7.2) M_600/M_ødot$ 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 $Łambda$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.

@misc{nierenberg2017probing, 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.}, added-at = {2017-01-20T10:06:44.000+0100}, author = {Nierenberg, A. M. and Treu, T. and Brammer, G. and Peter, A. H. G. and Fassnacht, C. D. and Keeton, C. R. and Kochanek, C. S. and Schmidt, K. B. and Sluse, D. and Wright, S. A.}, biburl = {https://www.bibsonomy.org/bibtex/2f1c916f857a2d98fd6ffc577b04797d0/miki}, description = {[1701.05188] Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism}, interhash = {ab20d3db65b80780d2139a73abbf9140}, intrahash = {f1c916f857a2d98fd6ffc577b04797d0}, keywords = {dark lense matter}, note = {cite arxiv:1701.05188Comment: Submitted to MNRAS, 14 pages, 8 figures}, timestamp = {2017-01-20T10:06:44.000+0100}, title = {Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism}, url = {http://arxiv.org/abs/1701.05188}, year = 2017 }