Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
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Double dark matter vision : twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism. / Nierenberg, A. M.; Gilman, D.; Treu, T.; Brammer, G.; Birrer, S.; Moustakas, L.; Agnello, A.; Anguita, T.; Fassnacht, C. D.; Motta, Francis; Peter, A. H. G.; Sluse, D.
In: Monthly Notices of the Royal Astronomical Society, Vol. 492, No. 4, 03.2020, p. 5314-5335.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Double dark matter vision
T2 - twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
AU - Nierenberg, A. M.
AU - Gilman, D.
AU - Treu, T.
AU - Brammer, G.
AU - Birrer, S.
AU - Moustakas, L.
AU - Agnello, A.
AU - Anguita, T.
AU - Fassnacht, C. D.
AU - Motta, Francis
AU - Peter, A. H. G.
AU - Sluse, D.
PY - 2020/3
Y1 - 2020/3
N2 - The magnifications of compact-source lenses are extremely sensitive to the presence of low mass dark matter haloes along the entire sightline from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational lenses has been limited to radio-loud systems, as the radio emission is extended and thus unaffected by microlensing which can mimic the signal of dark matter structure. An alternate approach is to measure quasar nuclear-narrow-line emission, which is free from microlensing and present in virtually all quasar lenses. In this paper, we double the number of systems which can he used for gravitational lensing analyses by presenting measurements of narrow-line emission from a sample of eight quadruply imaged quasar lens systems, WGD J0405-3308, HS 0810+2554, RX.10911+0551, SDSS J1330+1810, PS J1606-2333, WFI 2026-4536, WFI 2033-4723, and WGD J2038-4008. We describe our updated grism spectral modelling pipeline, which we use to measure narrow-line fluxes with uncertainties of 2-10 per cent, presented here. We fit the lensed image positions with smooth mass models and demonstrate that these models fail to produce the observed distribution of image fluxes over the entire sample of lenses. Furthermore, typical deviations are larger than those expected from macromodel uncertainties. This discrepancy indicates the presence of perturbations caused by small-scale dark matter structure. The interpretation of this result in terms of dark matter models is presented in a companion paper.
AB - The magnifications of compact-source lenses are extremely sensitive to the presence of low mass dark matter haloes along the entire sightline from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational lenses has been limited to radio-loud systems, as the radio emission is extended and thus unaffected by microlensing which can mimic the signal of dark matter structure. An alternate approach is to measure quasar nuclear-narrow-line emission, which is free from microlensing and present in virtually all quasar lenses. In this paper, we double the number of systems which can he used for gravitational lensing analyses by presenting measurements of narrow-line emission from a sample of eight quadruply imaged quasar lens systems, WGD J0405-3308, HS 0810+2554, RX.10911+0551, SDSS J1330+1810, PS J1606-2333, WFI 2026-4536, WFI 2033-4723, and WGD J2038-4008. We describe our updated grism spectral modelling pipeline, which we use to measure narrow-line fluxes with uncertainties of 2-10 per cent, presented here. We fit the lensed image positions with smooth mass models and demonstrate that these models fail to produce the observed distribution of image fluxes over the entire sample of lenses. Furthermore, typical deviations are larger than those expected from macromodel uncertainties. This discrepancy indicates the presence of perturbations caused by small-scale dark matter structure. The interpretation of this result in terms of dark matter models is presented in a companion paper.
KW - gravitational lensing: strong
KW - galaxies: dwarf
KW - galaxies: haloes
KW - dark matter
KW - INTEGRAL FIELD SPECTROSCOPY
KW - STAR-FORMATION HISTORIES
KW - BROAD EMISSION-LINES
KW - EARLY-TYPE GALAXIES
KW - EDGE-ON DISC
KW - GRAVITATIONAL LENSES
KW - SATELLITE GALAXIES
KW - DWARF GALAXIES
KW - MASS SUBSTRUCTURE
KW - II EMISSION
U2 - 10.1093/mnras/stz3588
DO - 10.1093/mnras/stz3588
M3 - Journal article
VL - 492
SP - 5314
EP - 5335
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 4
ER -
ID: 247938757