Identification of $>$40 gravitationally magnified stars in a galaxy at redshift of 0.725
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Fudamoto, Yoshinobu Sun, Fengwu Diego, Jose M. Dai, Liang Oguri, Masamune Zitrin, Adi Zackrisson, Erik Jauzac, Mathilde Lagattuta, David J. Egami, Eiichi Iani, Edoardo Windhorst, Rogier A. Abe, Katsuya T. Bauer, Franz Erik Bian, Fuyan Bhatawdekar, Rachana Broadhurst, Thomas J. Cai, Zheng Chen, Chian-Chou Chen, Wenlei Cohen, Seth H. Conselice, Christopher J. Espada, Daniel Foo, Nicholas Frye, Brenda L. Fujimoto, Seiji Furtak, Lukas J. Golubchik, Miriam Hsiao, Tiger Yu-Yang Jolly, Jean-Baptiste Kawai, Hiroki Kelly, Patrick L. Koekemoer, Anton M. Kohno, Kotaro Kokorev, Vasily Li, Mingyu Li, Zihao Lin, Xiaojing Magdis, Georgios E. Meena, Ashish K. Niemiec, Anna Nabizadeh, Armin Richard, Johan Steinhardt, Charles L. Wu, Yunjing Zhu, Yongda Zou, Siwei |
| author_facet | Fudamoto, Yoshinobu Sun, Fengwu Diego, Jose M. Dai, Liang Oguri, Masamune Zitrin, Adi Zackrisson, Erik Jauzac, Mathilde Lagattuta, David J. Egami, Eiichi Iani, Edoardo Windhorst, Rogier A. Abe, Katsuya T. Bauer, Franz Erik Bian, Fuyan Bhatawdekar, Rachana Broadhurst, Thomas J. Cai, Zheng Chen, Chian-Chou Chen, Wenlei Cohen, Seth H. Conselice, Christopher J. Espada, Daniel Foo, Nicholas Frye, Brenda L. Fujimoto, Seiji Furtak, Lukas J. Golubchik, Miriam Hsiao, Tiger Yu-Yang Jolly, Jean-Baptiste Kawai, Hiroki Kelly, Patrick L. Koekemoer, Anton M. Kohno, Kotaro Kokorev, Vasily Li, Mingyu Li, Zihao Lin, Xiaojing Magdis, Georgios E. Meena, Ashish K. Niemiec, Anna Nabizadeh, Armin Richard, Johan Steinhardt, Charles L. Wu, Yunjing Zhu, Yongda Zou, Siwei |
| contents | Strong gravitational magnifications enable to detect faint background sources, resolve their internal structures, and even identify individual stars in distant galaxies. Highly magnified individual stars allow various applications, including studies of stellar populations in distant galaxies and constraining dark matter structures in the lensing plane. However, these applications have been hampered by the small number of individual stars observed, as typically one or a few stars are identified from each distant galaxy. Here, we report the discovery of more than 40 microlensed stars in a single galaxy behind Abell 370 at redshift of 0.725 when the Universe was half of its current age (dubbed ``the Dragon arc''), using James Webb Space Telescope (JWST) observations with the time-domain technique. These events are found near the expected lensing critical curves, suggesting that these are magnified stars that appear as transients from intracluster stellar microlenses. Through multi-wavelength photometry, we constrain stellar types and find that many of them are consistent with red giants/supergiants magnified by factors of hundreds. This finding reveals an unprecedented high occurrence of microlensing events in the Dragon arc, and proves that {\it JWST}'s time-domain observations open up the possibility of conducting statistical studies of high-redshift stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_08045 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Identification of $>$40 gravitationally magnified stars in a galaxy at redshift of 0.725 Fudamoto, Yoshinobu Sun, Fengwu Diego, Jose M. Dai, Liang Oguri, Masamune Zitrin, Adi Zackrisson, Erik Jauzac, Mathilde Lagattuta, David J. Egami, Eiichi Iani, Edoardo Windhorst, Rogier A. Abe, Katsuya T. Bauer, Franz Erik Bian, Fuyan Bhatawdekar, Rachana Broadhurst, Thomas J. Cai, Zheng Chen, Chian-Chou Chen, Wenlei Cohen, Seth H. Conselice, Christopher J. Espada, Daniel Foo, Nicholas Frye, Brenda L. Fujimoto, Seiji Furtak, Lukas J. Golubchik, Miriam Hsiao, Tiger Yu-Yang Jolly, Jean-Baptiste Kawai, Hiroki Kelly, Patrick L. Koekemoer, Anton M. Kohno, Kotaro Kokorev, Vasily Li, Mingyu Li, Zihao Lin, Xiaojing Magdis, Georgios E. Meena, Ashish K. Niemiec, Anna Nabizadeh, Armin Richard, Johan Steinhardt, Charles L. Wu, Yunjing Zhu, Yongda Zou, Siwei Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Strong gravitational magnifications enable to detect faint background sources, resolve their internal structures, and even identify individual stars in distant galaxies. Highly magnified individual stars allow various applications, including studies of stellar populations in distant galaxies and constraining dark matter structures in the lensing plane. However, these applications have been hampered by the small number of individual stars observed, as typically one or a few stars are identified from each distant galaxy. Here, we report the discovery of more than 40 microlensed stars in a single galaxy behind Abell 370 at redshift of 0.725 when the Universe was half of its current age (dubbed ``the Dragon arc''), using James Webb Space Telescope (JWST) observations with the time-domain technique. These events are found near the expected lensing critical curves, suggesting that these are magnified stars that appear as transients from intracluster stellar microlenses. Through multi-wavelength photometry, we constrain stellar types and find that many of them are consistent with red giants/supergiants magnified by factors of hundreds. This finding reveals an unprecedented high occurrence of microlensing events in the Dragon arc, and proves that {\it JWST}'s time-domain observations open up the possibility of conducting statistical studies of high-redshift stars. |
| title | Identification of $>$40 gravitationally magnified stars in a galaxy at redshift of 0.725 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.08045 |