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

Patrick L. Kelly; Jose M. Diego; Steven Rodney; Nick Kaiser; Tom Broadhurst; Adi Zitrin; Tommaso Treu; Pablo G. Pérez-González; 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 Pérez-Fournon; Adam G. Riess; Piero Rosati; Kasper Borello Schmidt; Keren Sharon; Benjamin J. Weiner

doi:10.1038/s41550-018-0430-3

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

Patrick L. Kelly, Jose M. Diego, Steven Rodney, Nick Kaiser, Tom Broadhurst, Adi Zitrin, Tommaso Treu, Pablo G. Pérez-González, 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 HowellJohan 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 Pérez-Fournon, Adam G. Riess, Piero Rosati, Kasper Borello Schmidt, Keren Sharon, Benjamin J. Weiner

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English (US)
Pages (from-to)	334-342
Number of pages	9
Journal	Nature Astronomy
Volume	2
Issue number	4
DOIs	https://doi.org/10.1038/s41550-018-0430-3
State	Published - Apr 1 2018

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© 2018 The Author(s).

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Kelly, P. L., Diego, J. M., Rodney, S., Kaiser, N., Broadhurst, T., Zitrin, A., Treu, T., Pérez-González, P. G., Morishita, T., Jauzac, M., Selsing, J., Oguri, M., Pueyo, L., Ross, T. W., Filippenko, A. V., Smith, N., Hjorth, J., Cenko, S. B., Wang, X., ... Weiner, B. J. (2018). Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens. Nature Astronomy, 2(4), 334-342. https://doi.org/10.1038/s41550-018-0430-3

Kelly, PL, Diego, JM, Rodney, S, Kaiser, N, Broadhurst, T, Zitrin, A, Treu, T, Pérez-González, PG, Morishita, T, Jauzac, M, Selsing, J, Oguri, M, Pueyo, L, Ross, TW, Filippenko, AV, Smith, N, Hjorth, J, Cenko, SB, Wang, X, Howell, DA, Richard, J, Frye, BL, Jha, SW, Foley, RJ, Norman, C, Bradac, M, Zheng, W, Brammer, G, Benito, AM, Cava, A, Christensen, L, De Mink, SE, Graur, O, Grillo, C, Kawamata, R, Kneib, JP, Matheson, T, McCully, C, Nonino, M, Pérez-Fournon, I, Riess, AG, Rosati, P, Schmidt, KB, Sharon, K & Weiner, BJ 2018, 'Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens', Nature Astronomy, vol. 2, no. 4, pp. 334-342. https://doi.org/10.1038/s41550-018-0430-3

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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.",

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AU - Diego, Jose M.

AU - Rodney, Steven

AU - Kaiser, Nick

AU - Broadhurst, Tom

AU - Zitrin, Adi

AU - Treu, Tommaso

AU - Pérez-González, Pablo G.

AU - Morishita, Takahiro

AU - Jauzac, Mathilde

AU - Selsing, Jonatan

AU - Oguri, Masamune

AU - Pueyo, Laurent

AU - Ross, Timothy W.

AU - Filippenko, Alexei V.

AU - Smith, Nathan

AU - Hjorth, Jens

AU - Cenko, S. Bradley

AU - Wang, Xin

AU - Howell, D. Andrew

AU - Richard, Johan

AU - Frye, Brenda L.

AU - Jha, Saurabh W.

AU - Foley, Ryan J.

AU - Norman, Colin

AU - Bradac, Marusa

AU - Zheng, Weikang

AU - Brammer, Gabriel

AU - Benito, Alberto Molino

AU - Cava, Antonio

AU - Christensen, Lise

AU - De Mink, Selma E.

AU - Graur, Or

AU - Grillo, Claudio

AU - Kawamata, Ryota

AU - Kneib, Jean Paul

AU - Matheson, Thomas

AU - McCully, Curtis

AU - Nonino, Mario

AU - Pérez-Fournon, Ismael

AU - Riess, Adam G.

AU - Rosati, Piero

AU - Schmidt, Kasper Borello

AU - Sharon, Keren

AU - Weiner, Benjamin J.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - 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.

AB - 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.

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JO - Nature Astronomy

JF - Nature Astronomy

IS - 4

ER -

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

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