Document detail
ID
oai:arXiv.org:2404.08045
Topic
Astrophysics - Astrophysics of Gal... Astrophysics - Cosmology and Nonga...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. Nabizadeh, Armin Richard, Johan Steinhardt, Charles L. Wu, Yunjing Zhu, Yongda Zou, SiweiCategory
sciences: astrophysics
Year
2024
listing date
4/17/2024
Keywords
galaxies events astrophysicsAbstract
Strong gravitational magnification by massive galaxy clusters enable us to detect faint background sources, resolve their detailed internal structures, and in the most extreme cases identify and study individual stars in distant galaxies.
Highly magnified individual stars allow for a wide range of applications, including studies of stellar populations in distant galaxies and constraining small-scale dark matter structures.
However, these applications have been hampered by the small number of events observed, as typically one or a few stars are identified from each distant galaxy.
Here, we report the discovery of 46 significant microlensed stars in a single strongly-lensed high-redshift galaxy behind the Abell 370 cluster at redshift of 0.725 when the Universe was half of its current age (dubbed the ``Dragon arc''), based on two observations separated by one year with the James Webb Space Telescope ({\it JWST}).
These events are mostly found near the expected lensing critical curves, suggesting that these are magnified individual stars that appear as transients from intracluster stellar microlenses.
Through multi-wavelength photometry and colors, we constrain stellar types and find that many of them are consistent with red giants/supergiants magnified by factors of thousands.
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 and subgalactic scale perturbations in the lensing dark matter field.
;Comment: 15 pages, 4 figures, 1 table submitted to Nature Astronomy
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.,Nabizadeh, Armin,Richard, Johan,Steinhardt, Charles L.,Wu, Yunjing,Zhu, Yongda,Zou, Siwei, 2024, JWST Discovery of $40+$ Microlensed Stars in a Magnified Galaxy, the "Dragon" behind Abell 370
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