TY - UNPB
T1 - JWSTs PEARLS
T2 - NIRCam imaging and NIRISS spectroscopy of a $z=3.6$ star-forming galaxy lensed into a near-Einstein Ring by a $z=1.258$ massive elliptical galaxy
AU - Adams, Nathan J.
AU - Ferrami, Giovanni
AU - Westcott, Lewi
AU - Harvey, Thomas
AU - Estrada-Carpenter, Vicente
AU - Conselice, Christopher J.
AU - Austin, Duncan
AU - Wyithe, J. Stuart B.
AU - Goolsby, Caio M.
AU - Li, Qiong
AU - Rusakov, Vadim
AU - Windhorst, Rogier A.
AU - Cohen, Seth H.
AU - Jansen, Rolf A.
AU - Summers, Jake
AU - O'Brein, Roselia
AU - Koekemoer, Anton M.
AU - Driver, Simon P.
AU - Frye, Brenda
AU - Hathi, Nimish P.
AU - Coe, Dan
AU - Grogin, Norman A.
AU - Marshall, Madeline A.
AU - Pirzkal, Nor
AU - Ryan, Russell E.
AU - Willmer, Christopher N. A.
AU - Yan, Haojing
AU - Holwerda, Benne W.
AU - Kamieneski, Patrick S.
AU - Broadhurst, Tom
AU - Maksym, W. Peter
AU - Saikia, Payaswini
AU - Gelfand, Joseph D.
PY - 2025/4
Y1 - 2025/4
N2 - We present the discovery, and initial lensing analysis, of a high-redshift galaxy-galaxy lensing system within the JWST-PEARLS/HST-TREASUREHUNT North Ecliptic Pole Time Domain Field (designated NEPJ172238.9+655143.1). The lensing geometry shears a $z=3.6\pm0.1$ star-forming galaxy into a near-Einstein ring with a radius of 0\farcs92, consisting of 4 primary images, around a foreground massive elliptical galaxy at $z=1.258\pm0.005$. The system is fortuitously located within the NIRISS F200W footprint of the PEARLS survey, enabling spectroscopic identification of the 8500A TiO band in the foreground galaxy and allowing tight constraints to be placed on the redshift of the background galaxy based on its continuum detection and lack of strong emission lines. We calculate magnification factors of $2.6<μ<8.4$ for the four images and a total lensing mass of $(4.08 \pm 0.07)\times10^{11}M_\odot$. SED fitting of the foreground elliptical galaxy within the Einstein radius reveals a stellar mass of $\sim1.26\times10^{11}M_\odot$, providing a mass/light ratio of 3.24. Employing simple scaling relations and assumptions, an NFW dark matter halo is found to provide the correct remaining mass within $0.12^{+0.21}_{-0.09}$dex. However, if a bottom-heavy IMF for elliptical galaxies is employed, stellar mass estimations increase and can account for the majority of the lensing mass (up to $\sim$83\%), reducing the need for dark matter. This system further demonstrates the new discovery space that the combined wavelength coverage, sensitivity and resolution of JWST now enables....
AB - We present the discovery, and initial lensing analysis, of a high-redshift galaxy-galaxy lensing system within the JWST-PEARLS/HST-TREASUREHUNT North Ecliptic Pole Time Domain Field (designated NEPJ172238.9+655143.1). The lensing geometry shears a $z=3.6\pm0.1$ star-forming galaxy into a near-Einstein ring with a radius of 0\farcs92, consisting of 4 primary images, around a foreground massive elliptical galaxy at $z=1.258\pm0.005$. The system is fortuitously located within the NIRISS F200W footprint of the PEARLS survey, enabling spectroscopic identification of the 8500A TiO band in the foreground galaxy and allowing tight constraints to be placed on the redshift of the background galaxy based on its continuum detection and lack of strong emission lines. We calculate magnification factors of $2.6<μ<8.4$ for the four images and a total lensing mass of $(4.08 \pm 0.07)\times10^{11}M_\odot$. SED fitting of the foreground elliptical galaxy within the Einstein radius reveals a stellar mass of $\sim1.26\times10^{11}M_\odot$, providing a mass/light ratio of 3.24. Employing simple scaling relations and assumptions, an NFW dark matter halo is found to provide the correct remaining mass within $0.12^{+0.21}_{-0.09}$dex. However, if a bottom-heavy IMF for elliptical galaxies is employed, stellar mass estimations increase and can account for the majority of the lensing mass (up to $\sim$83\%), reducing the need for dark matter. This system further demonstrates the new discovery space that the combined wavelength coverage, sensitivity and resolution of JWST now enables....
U2 - 10.48550/arXiv.2504.03571
DO - 10.48550/arXiv.2504.03571
M3 - Working paper
SP - 1
EP - 10
BT - JWSTs PEARLS
PB - arXiv
ER -