An individual star at redshift 1.5 extremely magnified by a galaxy-cluster lens
Article 2017 en
Authors
PK
Patrick L. Kelly
JD
J. M. Diego
SR
S. Rodney
Abstract
1 min read
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.
Patrick L. Kelly, J. M. Diego, S. Rodney, Nick Kaiser, Tom Broadhurst, Adi Zitrin, Tommaso Treu, Pablo G. Pérez‐González, Takahiro Morishita, Mathilde Jauzac, J. Selsing, Masamune Oguri, Laurent Pueyo, Timothy W. Ross, Alexei V Filippenko, Nathan Smith, J. Hjorth, S. B. Cenko, Xin Wang, D. A. Howell, Johan Richard, Brenda Frye, Saurabh W. Jha, R. J. Foley, Colin Norman, Maruša Bradač, WeiKang Zheng, Gabriel Brammer, Alberto Molino Benito, A. Cava, L. Christensen, S. E. de Mink, Or Graur, C. Grillo, Ryota Kawamata, Jean‐Paul Kneib, T. Matheson, C. McCully, M. Nonino, I. Pérez‐Fournon, Adam G. Riess, P. Rosati, Marko Shuntov, Keren Sharon, Benjamin J. Weiner
Patrick L. Kelly, J. M. Diego, S. Rodney, Nick Kaiser, Tom Broadhurst, Adi Zitrin, Tommaso Treu, Pablo G. Pérez‐González, Takahiro Morishita, Mathilde Jauzac, J. Selsing, Masamune Oguri, Laurent Pueyo, Timothy W. Ross, Alexei V Filippenko, Nathan Smith, J. Hjorth, S. B. Cenko, Xin Wang, D. A. Howell, Johan Richard, Brenda Frye, Saurabh W. Jha, R. J. Foley, Colin Norman,
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Patrick L. Kelly, Wenlei Chen, Alfred Amruth, Thomas J. Broadhurst, J. M. Diego, Najmeh Emami, Alexei V Filippenko, Allison Keen, Sung Kei Li, Jeremy Lim, Ashish Kumar Meena, Masamune Oguri, Claudia Scarlata, Tommaso Treu, Hayley Williams, Liliya L. R. Williams, Rui Zhou, Adi Zitrin, R. J. Foley, Saurabh W. Jha, Nick Kaiser, Vihang Mehta, Steven Rieck,
J. M. Diego, Sung Kei Li, Ashish Kumar Meena, Anna Niemiec, Ana Acebrón, Mathilde Jauzac, Mitchell F. Struble, Alfred Amruth, Tom Broadhurst, Catherine Cerny, H. Ebeling, Alexei V Filippenko, Eric Jullo, Patrick Kelly, Anton M. Koekemoer, David Lagatutta, Jeremy Lim, Marceau Limousin, Guillaume Mahler, Nency Patel, Juan Remolina, Johan Richard, Keren Sharon,
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