gravitational lensing: strong; galaxies: dwarf; galaxies: haloes; dark matter; Astrophysics - Astrophysics of Galaxies; Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract :
[en] 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 be 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 J0911+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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nierenberg, A. M.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA 91109, USA
Gilman, D.; UCLA Physics & Astronomy, 475 Portola Plaza, Los Angeles, CA 90095-1547, USA
Treu, T.; UCLA Physics & Astronomy, 475 Portola Plaza, Los Angeles, CA 90095-1547, USA
Brammer, G.; The Cosmic Dawn Center, Niels Bohr Institute, Rockefeller Komplesket, Juliane Ma, DK-2100 København, Denmark
Birrer, S.; UCLA Physics & Astronomy, 475 Portola Plaza, Los Angeles, CA 90095-1547, USA
Moustakas, L.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA 91109, USA
Agnello, A.; Niels-Bohr Institute > DARK
Anguita, T.; Departamento de Ciencias Fisicas, Universidad Andres Bello, Fernandez Concha 700, 7591538 Las Condes, Santiago, Chile ; Millennium Institute of Astrophysics, Monseñor Nuncio Sotero Sanz 100, 7500011 Providencia, Santiago, Chile
Fassnacht, C. D.; Department of Physics, UC Davis, 1 Shields Ave., Davis CA 95616, USA
Motta, V.; Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Valparaíso, Chile
Peter, A. H. G.; Center for Cosmology and AstroParticle Physics, 191 West Woodruff Avenue, The Ohio State University, Columbus OH 43204, USA ; Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus OH 43204, USA ; Department of Astronomy, The Ohio State University, USA, 4055 McPherson Laboratory, 140 West 18th Avenue, Columbus OH
Sluse, Dominique ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Language :
English
Title :
Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
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