Shubo Li, Ran Li, Kaihao Wang, Zixiang Jia, Xiaoyue Cao

| Summary:

[[{“value”:”Previous studies, based on precise modeling of a gravitationally lensing
image, have identified what may be a extremely compact, dark perturber in the
well-known lensing system SDSSJ0946+1006 (the "Jackpot"). Its remarkable
compactness challenges the standard cold dark matter (CDM) paradigm. In this
paper, we explore whether such a compact perturber could be explained as a
core-collapsed halo described by the self-interacting dark matter (SIDM) model.
Using the isothermal Jeans method, we compute the density profiles of
core-collapsed halos across a range of masses. Our comparison with observations
indicates that only a core-collapsed halo with a total mass of approximately
$10^{11}~{rm M_{odot}}$ could produce an inner density profile and mass
enclosed within 1 kpc that is consistent with observational data. However, such
a massive dark matter halo should host a galaxy detectable by prior Hubble
imaging, which is not observed. Thus, the core-collapsed SIDM halo model
struggles to fully account for the exotic nature of the "little dark dot" in
the "Jackpot" lens.”}]] 

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