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Extreme magnification of a star at redshift 1.5 by a galaxy-cluster lens

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arxiv 1706.10279 v2 pith:BQLZW43E submitted 2017-06-30 astro-ph.GA astro-ph.CO

Patrick L. Kelly , Jose M. Diego , Steven Rodney , Nick Kaiser , Tom Broadhurst , Adi Zitrin , Tommaso Treu , Pablo G. Perez-Gonzalez
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Takahiro Morishita Mathilde Jauzac Jonatan Selsing Masamune Oguri Laurent Pueyo Timothy W. Ross Alexei V. Filippenko Nathan Smith Jens Hjorth S. Bradley Cenko Xin Wang D. Andrew Howell Johan Richard Brenda L. Frye Saurabh W. Jha Ryan J. Foley Colin Norman Marusa Bradac Weikang Zheng Gabriel Brammer Alberto Molino Benito Antonio Cava Lise Christensen Selma E. de Mink Or Graur Claudio Grillo Ryota Kawamata Jean-Paul Kneib Thomas Matheson Curtis McCully Mario Nonino Ismael Perez-Fournon Adam G. Riess Piero Rosati Kasper Borello Schmidt Keren Sharon Benjamin J. Weiner
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Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to ~50. Here we report an image of an individual star at redshift z=1.49 (dubbed "MACS J1149 Lensed Star 1 (LS1)") magnified by >2000. A separate image, detected briefly 0.26 arcseconds from LS1, is likely a counterimage of the first star demagnified for multiple years by a >~3 solar-mass object in the cluster. For reasonable assumptions about the lensing system, microlensing fluctuations in the stars' light curves can yield evidence about the mass function of intracluster stars and compact objects, including binary fractions and specific stellar evolution and supernova models. Dark-matter subhalos or massive compact objects may help to account for the two images' long-term brightness ratio.

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Cited by 3 Pith papers

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  3. Wide binaries in ultra-faint dwarf galaxies as a probe of extended dark objects

    hep-ph 2026-07 conditional novelty 5.0 of 10

    Wide binaries in Boötes I exclude dark-matter fractions down to ~10^-3 to 10^-2 for extended dark objects between 0.1 and 3000 solar masses with radii up to 10^7 solar radii, implying P_R ≲ 5×10^-6 at k ≈ 4×10^2-3×10^...

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