Estimating the size and abundance of dark matter subhaloes with gravitational millilensing

Bibcode
2017hsa9.conf..297V
Vives-Arias, H.; Jiménez-Vicente, J.; Muñoz, J. A.; Mediavilla, E.
Bibliographical reference

Highlights on Spanish Astrophysics IX, Proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain, ISBN 978-84-606-8760-3. S. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernández-Monteagudo, A. Sánchez-Lavega, S. Pérez-Hoyos (eds.), 2017 , p. 297-297

Advertised on:
3
2017
Number of authors
4
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We use 8 gravitational lens systems with quadruply imaged quasars and their observed flux ratio anomalies obtained using data in mid-infrared, radio or spectral narrow lines as a baseline, to estimate the amount of substructure in the dark matter halo of lens galaxies. We assume that the smooth gravitational potential of the galaxies is well modeled by a Singular Isothermal Ellipsoid (SIE) plus external shear (γ) and an additional Singular Isothermal Sphere (SIS) in some cases, and that the cause of the flux ratio anomalies is dark matter subhalos described by pseudo-Jaffe density profiles. Our Bayesian estimate for the Einstein radius of the subhalos is b = 0.0003^{+0.0005}_{-0.0002} arcsec, and their abundance (as a fraction of the total surface density of the lens galaxy at the image positions) is α =Ê0.075^{+0.030}_{-0.021}.
Type
Non-refereed

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