Journal
NATURE ASTRONOMY
Volume 2, Issue 4, Pages 334-342Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41550-018-0430-3
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Funding
- NASA/STScI [14041, 14199, 14208, 14528, 14872, 14922]
- NSF [PHY-1607611, AST-1518052, AST-1602595]
- MINECO/FEDER, UE [AYA2015-64508-P]
- Ministerio de Economia y Competitividad [CSD2010-00064]
- Spanish government MINECO [AYA2015-70815-ERC, AYA2015-63650-P]
- JSPS KAKENHI [26800093, 15H05892]
- Science and Technology Facilities Council [ST/L00075X/1]
- Sloan and Packard Foundation fellowships
- PRIN-INAF [1.05.01.94.02]
- VILLUM FONDEN Investigator Grant [16599]
- [AYA2012-39475-C02-01]
- STFC [ST/P000541/1, ST/L00075X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L00075X/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [1720756] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1720756] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [26800093] Funding Source: KAKEN
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Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to similar to 50. Here we report an image of an individual star at redshift z = 1.49 (dubbed MACS J1149 Lensed Star 1) magnified by more than x 2,000. A separate image, detected briefly 0.26 '' from Lensed Star 1, is probably a counterimage of the first star demagnified for multiple years by an object of greater than or similar to 3 solar masses 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 subhaloes or massive compact objects may help to account for the two images' long-term brightness ratio.
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