Dark Matter Substructure in Lensing Galaxies
Masashi Chiba, Takeo Minezaki, Kaiki T. Inoue, Nobunari Kashikawa,, Hirokazu Kataza, Hajime Sugai
TL;DR
This study uses mid-infrared imaging and spectroscopy of quadruple lens systems to differentiate between dark matter subhalos and stars as causes of flux ratio anomalies, advancing understanding of dark matter distribution.
Contribution
It introduces a method combining mid-infrared imaging and integral-field spectroscopy to identify dark matter substructure in lensing galaxies.
Findings
Successful differentiation of millilensing from microlensing.
Progress in analyzing dark matter substructure.
Enhanced constraints on small-scale dark matter halos.
Abstract
To set useful limits on the abundance of small-scale dark matter halos (subhalos) in a galaxy scale, we have carried out mid-infrared imaging and integral-field spectroscopy for a sample of quadruple lens systems showing anomalous flux ratios. These observations using Subaru have been successful for distinguishing millilensing by subhalos from microlensing by stars. Current status for our lensing analysis of dark matter substructure is reported.
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Taxonomy
TopicsAstronomy and Astrophysical Research · History and Developments in Astronomy · Experimental and Theoretical Physics Studies