AWhat changed
Hubble monitoring of the field containing supernova Refsdal revealed a brightening point source, LS1, in a background galaxy at redshift 1.49. Its color and light curve were interpreted as a strongly magnified individual star, with the authors estimating a peak magnification of at least about 2,000 under their lens model. The observation illustrates how cluster lensing combined with microlensing can reveal individual stars at cosmological distances.
Scientific scope
Hubble monitoring of the field containing supernova Refsdal revealed a brightening point source, LS1, in a background galaxy at redshift 1.49. Its color and light curve were interpreted as a strongly magnified individual star, with the authors estimating a peak magnification of at least about 2,000 under their lens model. The observation illustrates how cluster lensing combined with microlensing can reveal individual stars at cosmological distances. The source identification, stellar temperature and magnification depend on spectral and lens models, and different cluster models disagree appreciably. A nearby 2016 transient may be a counterimage or a different star; this is not a confirmed compact-object detection. The paper explores model-dependent dark-matter constraints, not a direct measurement of the dark-matter particle. This star is distinct from the Refsdal supernova, although the monitoring field and some observations overlap. The supplementary simulated counterimage and dark-matter comparisons assume a lens geometry and stellar mass density; luminous-star clustering and the possibility of an unresolved pair can affect the interpretation.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The source identification, stellar temperature and magnification depend on spectral and lens models, and different cluster models disagree appreciably. A nearby 2016 transient may be a counterimage or a different star; this is not a confirmed compact-object detection. The paper explores model-dependent dark-matter constraints, not a direct measurement of the dark-matter particle. This star is distinct from the Refsdal supernova, although the monitoring field and some observations overlap. The supplementary simulated counterimage and dark-matter comparisons assume a lens geometry and stellar mass density; luminous-star clustering and the possibility of an unresolved pair can affect the interpretation.
Contributors
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