论文标题

冷灯II。表征明亮的强烈镜头的早期型星系的大小和星形的历史。

COOL-LAMPS II. Characterizing the Size and Star Formation History of a Bright Strongly Lensed Early-Type Galaxy at Redshift 1.02

论文作者

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., Acuña, Owen S. Matthews, Medina, Elisabeth, Merz, Kaiya, Sanchez, Jorge A., Sisco, Emily E., Stein, Daniel J. Kavin, Tavangar, Kiyan, Whitaker, Katherine E.

论文摘要

我们提出了凉爽的J1323+0343,这是$ z = 1.0153 \ pm 0.0006 $的早期类型的星系,由z = $ z = 0.353 \ pm 0.001 $的星系群强烈镜头。该对象最初是由贴花成像成像的,并被酷灯引起的引力镜头,该协作旨在在最近的公共光学成像数据中找到强镜系统,并通过后续数据确认。通过基于地面的GRZH成像和来自LAS Campanas天文台和北欧光学望远镜的光谱法,我们从恒星群体的合成模型中得出了恒星质量,金属性和恒星形成史。镜头建模意味着$μ\ sim $ 113的总放大率。 The median remnant stellar mass in the source plane is M$_* \sim 10.63$ $M_\odot$ and the median star-formation rate in the source plane is SFR $\sim 1.55 \times 10^{-3}$ M$_\odot$ yr$^{-1}$ (log sSFR = -13.4 yr$^{-1}$) in the youngest two age垃圾箱(0-100 Myr),最接近观察时代。我们的测量值将凉爽的J1323+0343放置在恒星质量函数的特征质量下方,这使其成为一个特别引人注目的目标,可以帮助阐明中间质量静态星系的发展方式。我们在源平面中重建酷的J1323+0343并安装其光谱。该对象低于该质量的早期类型星系的预期尺寸进化,有效半径为r $ _e \ sim $ 0.5 kpc。这个非常放大和明亮的早期型银河系为研究中级质量早期型星系的形态和星形形成历史提供了令人兴奋的机会,详细介绍了$ z \ sim $ 1。

We present COOL J1323+0343, an early-type galaxy at $z = 1.0153 \pm 0.0006$, strongly lensed by a cluster of galaxies at z = $z = 0.353 \pm 0.001$. 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 of $μ\sim $113. The median remnant stellar mass in the source plane is M$_* \sim 10.63$ $M_\odot$ and the median star-formation rate in the source plane is SFR $\sim 1.55 \times 10^{-3}$ M$_\odot$ yr$^{-1}$ (log sSFR = -13.4 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 early-type galaxy at this mass with an effective radius r$_e \sim$ 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 \sim $1 .

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