JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z = 6.2

The gravitationally lensed star WHL 0137–LS, nicknamed Earendel, was identified with a photometric redshift zphot = 6.2 ± 0.1 based on images taken with the Hubble Space Telescope. Here we present James Webb Space Telescope (JWST) Near Infrared Camera images of Earendel in eight filters spanning 0.8...

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Detalles Bibliográficos
Autores: Welch, Brian, Coe, Dan, Zackrisson, Erik, de Mink, S. E., Ravindranath, Swara, Anderson, Jay, Brammer, Gabriel, Bradley, Larry, Yoon, Jinmi, Kelly, Patrick L., Diego, José, Windhorst, Rogier A., Zitrin, Adi, Dimauro, Paola, Jiménez Teja, Yolanda, Abdurro'uf, Nonino, Mario, Acebrón, Ana, Andrade Santos, Felipe, Ávila, Roberto J., Bayliss, Matthew B., Benítez, Alex, Broadhurst, Thomas, Bhatawdekar, Rachana, Bradac, Marusa, Caminha, Gabriel B., Chen, Wenlei, Eldridge, Jan, Farag, Ebraheem, Florian, Michael, Frye, Brenda L., Fujimoto, Seiji, Gómez, Sebastián, Henry, Alaina, Hsiao, Tiger Yu-Yang, Hutchison, Taylor A., James, Bethan L., Joyce, Meridith, Jung, Intae, Khullar, Gourav, Larson, Rebecca L., Mahler, Guillaume, Mandelker, Nir, McCandliss, Stephan, Morishita, Takahiro, Newshore, Rosa, Norman, Colin, O'Connor, Kyle, Oesch, Pascal A., Oguri, Masamune, Ouchi, Masami, Postman, Marc, Rigby, Jane R., Ryan, Russell E. Jr., Sharma, Soniya, Sharon, Keren, Strait, Victoria, Strolger, Louis Gregory, Timmes, F. X, Toft, Sune, Trenti, Michele, Vanzella, Eros, Vikaeus, Anton
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/59728
Acceso en línea:http://hdl.handle.net/10810/59728
Access Level:acceso abierto
Palabra clave:gravitational lensing
strong gravitational lensing
massive stars
Descripción
Sumario:The gravitationally lensed star WHL 0137–LS, nicknamed Earendel, was identified with a photometric redshift zphot = 6.2 ± 0.1 based on images taken with the Hubble Space Telescope. Here we present James Webb Space Telescope (JWST) Near Infrared Camera images of Earendel in eight filters spanning 0.8–5.0 μm. In these higher-resolution images, Earendel remains a single unresolved point source on the lensing critical curve, increasing the lower limit on the lensing magnification to μ > 4000 and restricting the source plane radius further to r < 0.02 pc, or ∼4000 au. These new observations strengthen the conclusion that Earendel is best explained by an individual star or multiple star system and support the previous photometric redshift estimate. Fitting grids of stellar spectra to our photometry yields a stellar temperature of Teff ≃ 13,000–16,000 K, assuming the light is dominated by a single star. The delensed bolometric luminosity in this case ranges from log(L)=5.8 to 6.6 L⊙, which is in the range where one expects luminous blue variable stars. Follow-up observations, including JWST NIRSpec scheduled for late 2022, are needed to further unravel the nature of this object, which presents a unique opportunity to study massive stars in the first billion years of the universe.

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