Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field

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

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Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field. / Chen, Wenlei; Kelly, Patrick L.; Treu, Tommaso; Wang, Xin; Roberts-Borsani, Guido; Keen, Allison; Windhorst, Rogier A.; Zhou, Rui; Bradac, Marusa; Brammer, Gabriel; Strait, Victoria; Broadhurst, Tom J.; Diego, Jose M.; Frye, Brenda L.; Meena, Ashish K.; Zitrin, Adi; Pascale, Massimo; Castellano, Marco; Marchesini, Danilo; Morishita, Takahiro; Yang, Lilan.

In: Astrophysical Journal Letters, Vol. 940, No. 2, L54, 01.12.2022.

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

Harvard

Chen, W, Kelly, PL, Treu, T, Wang, X, Roberts-Borsani, G, Keen, A, Windhorst, RA, Zhou, R, Bradac, M, Brammer, G, Strait, V, Broadhurst, TJ, Diego, JM, Frye, BL, Meena, AK, Zitrin, A, Pascale, M, Castellano, M, Marchesini, D, Morishita, T & Yang, L 2022, 'Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field', Astrophysical Journal Letters, vol. 940, no. 2, L54. https://doi.org/10.3847/2041-8213/ac9585

APA

Chen, W., Kelly, P. L., Treu, T., Wang, X., Roberts-Borsani, G., Keen, A., Windhorst, R. A., Zhou, R., Bradac, M., Brammer, G., Strait, V., Broadhurst, T. J., Diego, J. M., Frye, B. L., Meena, A. K., Zitrin, A., Pascale, M., Castellano, M., Marchesini, D., ... Yang, L. (2022). Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field. Astrophysical Journal Letters, 940(2), [L54]. https://doi.org/10.3847/2041-8213/ac9585

Vancouver

Chen W, Kelly PL, Treu T, Wang X, Roberts-Borsani G, Keen A et al. Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field. Astrophysical Journal Letters. 2022 Dec 1;940(2). L54. https://doi.org/10.3847/2041-8213/ac9585

Author

Chen, Wenlei ; Kelly, Patrick L. ; Treu, Tommaso ; Wang, Xin ; Roberts-Borsani, Guido ; Keen, Allison ; Windhorst, Rogier A. ; Zhou, Rui ; Bradac, Marusa ; Brammer, Gabriel ; Strait, Victoria ; Broadhurst, Tom J. ; Diego, Jose M. ; Frye, Brenda L. ; Meena, Ashish K. ; Zitrin, Adi ; Pascale, Massimo ; Castellano, Marco ; Marchesini, Danilo ; Morishita, Takahiro ; Yang, Lilan. / Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field. In: Astrophysical Journal Letters. 2022 ; Vol. 940, No. 2.

Bibtex

@article{b3523244a22444a4a61d138a49121109,

title = "Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field",

abstract = "We report the discovery of an extremely magnified star at redshift z = 2.65 in the James Webb Space Telescope (JWST) NIRISS pre-imaging of the A2744 galaxy-cluster field. The star{\textquoteright}s background host galaxy lies on a fold caustic of the foreground lens, and the cluster creates a pair of images of the region close to the lensed star. We identified the bright transient in one of the merging images at a distance of ∼0.″15 from the critical curve by subtracting the JWST F115W and F150W imaging from coadditions of archival Hubble Space Telescope (HST) F105W and F125W images and F140W and F160W images, respectively. Since the time delay between the two images should be only hours, the transient must be the microlensing event of an individual star, as opposed to a luminous stellar explosion that would persist for days to months. Analysis of individual exposures suggests that the star{\textquoteright}s magnification is not changing rapidly during the observations. From photometry of the point source through the F115W, F150W, and F200W filters, we identify a strong Balmer break, and modeling allows us to constrain the star{\textquoteright}s temperature to be approximately 7000-12,000 K.",

author = "Wenlei Chen and Kelly, {Patrick L.} and Tommaso Treu and Xin Wang and Guido Roberts-Borsani and Allison Keen and Windhorst, {Rogier A.} and Rui Zhou and Marusa Bradac and Gabriel Brammer and Victoria Strait and Broadhurst, {Tom J.} and Diego, {Jose M.} and Frye, {Brenda L.} and Meena, {Ashish K.} and Adi Zitrin and Massimo Pascale and Marco Castellano and Danilo Marchesini and Takahiro Morishita and Lilan Yang",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = dec,

day = "1",

doi = "10.3847/2041-8213/ac9585",

language = "English",

volume = "940",

journal = "The Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing",

number = "2",

}

RIS

TY - JOUR

T1 - Early Results from GLASS-JWST. VIII. An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the A2744 Cluster Field

AU - Chen, Wenlei

AU - Kelly, Patrick L.

AU - Treu, Tommaso

AU - Wang, Xin

AU - Roberts-Borsani, Guido

AU - Keen, Allison

AU - Windhorst, Rogier A.

AU - Zhou, Rui

AU - Bradac, Marusa

AU - Brammer, Gabriel

AU - Strait, Victoria

AU - Broadhurst, Tom J.

AU - Diego, Jose M.

AU - Frye, Brenda L.

AU - Meena, Ashish K.

AU - Zitrin, Adi

AU - Pascale, Massimo

AU - Castellano, Marco

AU - Marchesini, Danilo

AU - Morishita, Takahiro

AU - Yang, Lilan

PY - 2022/12/1

Y1 - 2022/12/1

N2 - We report the discovery of an extremely magnified star at redshift z = 2.65 in the James Webb Space Telescope (JWST) NIRISS pre-imaging of the A2744 galaxy-cluster field. The star’s background host galaxy lies on a fold caustic of the foreground lens, and the cluster creates a pair of images of the region close to the lensed star. We identified the bright transient in one of the merging images at a distance of ∼0.″15 from the critical curve by subtracting the JWST F115W and F150W imaging from coadditions of archival Hubble Space Telescope (HST) F105W and F125W images and F140W and F160W images, respectively. Since the time delay between the two images should be only hours, the transient must be the microlensing event of an individual star, as opposed to a luminous stellar explosion that would persist for days to months. Analysis of individual exposures suggests that the star’s magnification is not changing rapidly during the observations. From photometry of the point source through the F115W, F150W, and F200W filters, we identify a strong Balmer break, and modeling allows us to constrain the star’s temperature to be approximately 7000-12,000 K.

AB - We report the discovery of an extremely magnified star at redshift z = 2.65 in the James Webb Space Telescope (JWST) NIRISS pre-imaging of the A2744 galaxy-cluster field. The star’s background host galaxy lies on a fold caustic of the foreground lens, and the cluster creates a pair of images of the region close to the lensed star. We identified the bright transient in one of the merging images at a distance of ∼0.″15 from the critical curve by subtracting the JWST F115W and F150W imaging from coadditions of archival Hubble Space Telescope (HST) F105W and F125W images and F140W and F160W images, respectively. Since the time delay between the two images should be only hours, the transient must be the microlensing event of an individual star, as opposed to a luminous stellar explosion that would persist for days to months. Analysis of individual exposures suggests that the star’s magnification is not changing rapidly during the observations. From photometry of the point source through the F115W, F150W, and F200W filters, we identify a strong Balmer break, and modeling allows us to constrain the star’s temperature to be approximately 7000-12,000 K.

U2 - 10.3847/2041-8213/ac9585

DO - 10.3847/2041-8213/ac9585

M3 - Letter

AN - SCOPUS:85143870033

VL - 940

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - L54

ER -

ID: 342932096

Niels Bohr Institute