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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27679
Title: Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens
Authors: Kelly, Patrick L.
Diego, Jose M.
Rodney, Steven
Kaiser, Nick
Broadhurst, Tom
Zitrin, Adi
Treu, Tommaso
Pérez-González, Pablo G.
Morishita, Takahiro
Jauzac, Mathilde
Selsing, Jonatan
Oguri, Masamune
Pueyo, Laurent
Ross, Timothy W.
Filippenko, Alexei V.
Smith, Nathan
Hjorth, Jens
Cenko, S. Bradley
Wang, Xin
Howell, D. Andrew
Richard, Johan
Frye, Brenda L.
Jha, Saurabh W.
Foley, Ryan J.
Norman, Colin
Bradac, Marusa
Zheng, Weikang
Brammer, Gabriel
Benito, Alberto Molino
Cava, Antonio
Christensen, Lise
de Mink, Selma E.
Graur, Or
GRILLO, CLAUDIO
Kawamata, Ryota
Kneib, Jean-Paul
Matheson, Thomas
McCully, Curtis
NONINO, Mario 
Pérez-Fournon, Ismael
Riess, Adam G.
Rosati, Piero
Schmidt, Kasper Borello
Sharon, Keren
Weiner, Benjamin J.
Issue Date: 2018
Journal: NATURE ASTRONOMY 
Number: 2
First Page: 334
Abstract: 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) magnified by more than ×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 ≳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.
Acknowledgments: M.N. acknowledges support from PRIN-INAF- 2014 1.05.01.94.02.
URI: http://hdl.handle.net/20.500.12386/27679
URL: https://www.nature.com/articles/s41550-018-0430-3
ISSN: 2397-3366
DOI: 10.1038/s41550-018-0430-3
Bibcode ADS: 2018NatAs...2..334K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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Nature Astr. 1706.10279.pdfpreprint11.92 MBAdobe PDFView/Open
kelly_icarus_s41550-018-0430-3.pdf[Administrators only]3.42 MBAdobe PDF
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