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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 |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Nature Astr. 1706.10279.pdf | preprint | 11.92 MB | Adobe PDF | View/Open |
| kelly_icarus_s41550-018-0430-3.pdf | [Administrators only] | 3.42 MB | Adobe PDF |
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