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Sukay, Ezra; Khullar, Gourav; Gladders, Michael D.; Sharon, Keren; Mahler, Guillaume; Napier, Kate; Bleem, Lindsey E.; Dahle, HÅkon; Florian, Michael K.; Gozman, Katya; Lin, Jason J.; Martinez, Michael N.; Matthews Acuña, Owen S.; Medina, Elisabeth; Merz, Kaiya; Sanchez, Jorge A.; Sisco, Emily E.; Kavin Stein, Daniel J.; Tavangar, Kiyan; Whitaker, Katherine E.
The Astrophysical journal, 11/2022, Letnik: 940, Številka: 1Journal Article
Abstract We present COOL J1323+0343, an early-type galaxy at z = 1.0153 ± 0.0006, strongly lensed by a cluster of galaxies at z = 0.353 ± 0.001. This object was originally imaged by DECaLS and noted as a gravitational lens by COOL-LAMPS, a collaboration initiated to find strong-lensing systems in recent public optical imaging data, and confirmed with follow-up data. With ground-based grzH imaging and optical spectroscopy from the Las Campanas Observatory and the Nordic Optical Telescope, we derive a stellar mass, metallicity, and star formation history from stellar-population synthesis modeling. The lens modeling implies a total magnification, summed over the three images in the arc, of μ ∼ 113. The stellar mass in the source plane is M * ∼ 10.64 M ⊙ and the 1 σ upper limit on the star formation rate (SFR) in the source plane is SFR ∼ 3.75 × 10 −2 M ⊙ yr −1 (log sSFR = −12.1 yr −1 ) in the youngest two age bins (0–100 Myr), closest to the epoch of observation. Our measurements place COOL J1323+0343 below the characteristic mass of the stellar mass function, making it an especially compelling target that could help clarify how intermediate-mass quiescent galaxies evolve. We reconstruct COOL J1323+0343 in the source plane and fit its light profile. This object is below the expected size evolution of an early-type galaxy at this mass with an effective radius r e ∼ 0.5 kpc. This extraordinarily magnified and bright lensed early-type galaxy offers an exciting opportunity to study the morphology and star formation history of an intermediate-mass early-type galaxy in detail at z ∼ 1.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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