很久以前，在遥远的银河系中

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很久以前，在遥远的银河系中

A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ~ 12 Galaxy in Early JWST CEERS Imaging

论文作者

Finkelstein, Steven L., Bagley, Micaela B., Haro, Pablo Arrabal, Dickinson, Mark, Ferguson, Henry C., Kartaltepe, Jeyhan S., Papovich, Casey, Burgarella, Denis, Kocevski, Dale D., Huertas-Company, Marc, Iyer, Kartheik G., Larson, Rebecca L., Pérez-González, Pablo G., Rose, Caitlin, Tacchella, Sandro, Wilkins, Stephen M., Chworowsky, Katherine, Medrano, Aubrey, Morales, Alexa M., Somerville, Rachel S., Yung, L. Y. Aaron, Fontana, Adriano, Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Kewley, Lisa J., Koekemoer, Anton M., Kirkpatrick, Allison, Kurczynski, Peter, Lotz, Jennifer M., Pentericci, Laura, Pirzkal, Nor, Ravindranath, Swara, Ryan Jr., Russell E., Trump, Jonathan R., Yang, Guang, Almaini, Omar, Amorín, Ricardo O., Annunziatella, Marianna, Backhaus, Bren E., Barro, Guillermo, Behroozi, Peter, Bell, Eric F., Bhatawdekar, Rachana, Bisigello, Laura, Bromm, Volker, Buat, Véronique, Buitrago, Fernando, Calabró, Antonello, Casey, Caitlin M., Castellano, Marco, Ortiz, Óscar A. Chávez, Ciesla, Laure, Cleri, Nikko J., Cohen, Seth H., Cole, Justin W., Cooke, Kevin C., Cooper, M. C., Cooray, Asantha R., Costantin, Luca, Cox, Isabella G., Croton, Darren, Daddi, Emanuele, Davé, Romeel, de la Vega, Alexander, Dekel, Avishai, Elbaz, David, Estrada-Carpenter, Vicente, Faber, Sandra M., Fernández, Vital, Finkelstein, Keely D., Freundlich, Jonathan, Fujimoto, Seiji, García-Argumánez, Ángela, Gardner, Jonathan P., Gawiser, Eric, Gómez-Guijarro, Carlos, Guo, Yuchen, Hamilton, Timothy S., Hathi, Nimish P., Holwerda, Benne W., Hirschmann, Michaela, Hutchison, Taylor A., Jaskot, Anne, Jha, Saurabh W., Jogee, Shardha, Juneau, Stéphanie, Jung, Intae, Kassin, Susan A., Bail, Aurélien Le, Leung, Gene C. K., Lucas, Ray A., Magnelli, Benjamin, Mantha, Kameswara Bharadwaj, Matharu, Jasleen, McGrath, Elizabeth J., McIntosh, Daniel H., Merlin, Emiliano, Mobasher, Bahram, Newman, Jeffrey A., Nicholls, David C., Pandya, Viraj, Rafelski, Marc, Ronayne, Kaila, Santini, Paola, Seillé, Lise-Marie, Shah, Ekta A., Shen, Lu, Simons, Raymond C., Snyder, Gregory F., Stanway, Elizabeth R., Straughn, Amber N., Teplitz, Harry I., Vanderhoof, Brittany N., Vega-Ferrero, Jesús, Wang, Weichen, Weiner, Benjamin J., Willmer, Christopher N. A., Wuyts, Stijn, Zavala, Jorge A.

论文摘要

我们报告了在JWST宇宙进化论早期发行科学（CEER）调查的第一个时期的Z〜12的候选星系。遵循保守的选择标准，我们识别具有强大z_phot = 11.8^+0.3_-0.2（1- sigma不确定性）的源，m_f200W = 27.3 = 27.3，五个过滤器中的> 7- sigma检测。在HST和JWST的深度成像中，在Lambda <1.4UM上未检测到该源，并且在JWST F150W和HST F160W中均具有微弱的3-sigma检测，该检测表明两个过滤器的红色边缘附近的Ly-Alpha断裂，暗示Z〜12。该对象（Maisie的银河系）展示了F115W-F200W> 1.9 MAG（2- sigma下限），带有蓝色连续斜坡，导致99.6％的Photo-Z PDF偏爱Z> 11。所有数据质量图像都没有显示出在候选人的位置上的伪像，并且与Z的恒星相处呈强烈分析，其颜色为11> 11。（R_H = 340 +/- 14 PC）。 Maisie的Galaxy具有log M*/MSOL〜8.5，并且是高度恒星形成的（log SSFR〜-8.2 Yr^-1），带有蓝色的REST-UV颜色（beta〜-2.5），表明灰尘虽然不是极低的金属性。尽管该来源的存在与大多数预测保持紧张，但它与经验外推一致，假设紫外线光度函数随着红移的增加而平稳下降。应该验证这种红移，我们的宇宙已经在大爆炸之后的星系少于400 Myr。

We report the discovery of a candidate galaxy with a photo-z of z~12 in the first epoch of the JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify a source with a robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) with m_F200W=27.3, and >7-sigma detections in five filters. The source is not detected at lambda < 1.4um in deep imaging from both HST and JWST, and has faint ~3-sigma detections in JWST F150W and HST F160W, which signal a Ly-alpha break near the red edge of both filters, implying z~12. This object (Maisie's Galaxy) exhibits F115W-F200W > 1.9 mag (2-sigma lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z PDF favoring z > 11. All data quality images show no artifacts at the candidate's position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r_h = 340 +/- 14 pc). Maisie's Galaxy has log M*/Msol ~ 8.5 and is highly star-forming (log sSFR ~ -8.2 yr^-1), with a blue rest-UV color (beta ~ -2.5) indicating little dust though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions which smoothly decline with increasing redshift. Should followup spectroscopy validate this redshift, our Universe was already aglow with galaxies less than 400 Myr after the Big Bang.

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