JWST CEERS 观测中伪装成极高红移星系的尘埃星暴星系
摘要
在 JWST/NIRCam 观测中，z>10 的莱曼断裂星系(LBG)候选体正被快速证认。由于（红移后的）静止系紫外光子被中性氢吸收所产生的（红移后）断裂，这些源预期在较蓝滤光片中出现 dropout，而在较红滤光片中被良好探测。然而，此处我们表明，较低红移(z<7)的尘埃笼罩恒星形成星系也可能模仿 z>10 LBG 的近红外(near-IR)颜色，从而成为 LBG 候选样本中的潜在污染者。首先，我们分析 CEERS-DSFG-1，一个在 F115W 和 F150W 滤光片中未探测到但在更长波长处被探测到的 NIRCam dropout 源。结合 JWST 数据与（亚）毫米波约束（包括深度 NOEMA 干涉观测），我们表明该源是一颗位于 z~5.1 的尘埃恒星形成星系(DSFG)。我们还呈现了在同一场中最近证认的 z~16 LBG 候选体周围 850um 处一个 tentative 的 2.6σ SCUBA-2 探测，并表明，若该辐射真实且与该候选体相关，则现有测光与一颗具有强星云发射线的 z~5 尘埃星系一致，尽管其近红外颜色偏蓝。对该候选体的进一步观测势在必行，以降低此 tentative 亚毫米波辐射的低置信度及其位置不确定性。我们的分析表明，NIRCam dropout 星系的可靠（亚）毫米波探测很可能意味着 z=4-6 的红移解，其中观测到的近红外断裂将是强静止系光学 Balmer 断裂叠加高尘埃消光和强星云线发射的结果，而非静止系紫外 Lyman 断裂。这提供了证据表明 DSFG 可能污染 JWST 观测中对极高红移 LBG 候选体的搜寻。
引用
@article{arxiv.2208.01816,
title = {Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations},
author = {Jorge A. Zavala and Veronique Buat and Caitlin M. Casey and Denis Burgarella and Steven L. Finkelstein and Micaela B. Bagley and Laure Ciesla and Emanuele Daddi and Mark Dickinson and Henry C. Ferguson and Maximilien Franco and E. F. Jim'enez-Andrade and Jeyhan S. Kartaltepe and Anton M. Koekemoer and Aurélien Le Bail and E. J. Murphy and Casey Papovich and Sandro Tacchella and Stephen M. Wilkins and Itziar Aretxaga and Peter Behroozi and Jaclyn B. Champagne and Adriano Fontana and Mauro Giavalisco and Andrea Grazian and Norman A. Grogin and Lisa J. Kewley and Dale D. Kocevski and Allison Kirkpatrick and Jennifer M. Lotz and Laura Pentericci and Pablo G. Perez-Gonzalez and Nor Pirzkal and Swara Ravindranath and Rachel S. Somerville and Jonathan R. Trump and Guang Yang and L. Y. Aaron Yung and Omar Almaini and Ricardo O. Amorin and Marianna Annunziatella and Pablo Arrabal Haro and Bren E. Backhaus and Guillermo Barro and Eric F. Bell and Rachana Bhatawdekar and Laura Bisigello and Fernando Buitrago and Antonello Calabro and Marco Castellano and Oscar A. Chavez Ortiz and Katherine Chworowsky and Nikko J. Cleri and Seth H. Cohen and Justin W. Cole and Kevin C. Cooke and M. C. Cooper and Asantha R. Cooray and Luca Costantin and Isabella G. Cox and Darren Croton and Romeel Dave and Alexander de la Vega and Avishai Dekel and David Elbaz and Vicente Estrada-Carpenter and Vital Fernández and Keely D. Finkelstein and Jonathan Freundlich and Seiji Fujimoto and Ángela García-Argumánez and Jonathan P. Gardner and Eric Gawiser and Carlos Gómez-Guijarro and Yuchen Guo and Timothy S. Hamilton and Nimish P. Hathi and Benne W. Holwerda and Michaela Hirschmann and Marc Huertas-Company and Taylor A. Hutchison and Kartheik G. Iyer and Anne E. Jaskot and Saurabh W. Jha and Shardha Jogee and Stéphanie Juneau and Intae Jung and Susan A. Kassin and Peter Kurczynski and Rebecca L. Larson and Gene C. K. Leung and Arianna Long and Ray A. Lucas and Benjamin Magnelli and Kameswara Bharadwaj Mantha and Jasleen Matharu and Elizabeth J. McGrath and Daniel H. McIntosh and Aubrey Medrano and Emiliano Merlin and Bahram Mobasher and Alexa M. Morales and Jeffrey A. Newman and David C. Nicholls and Viraj Pandya and Marc Rafelski and Kaila Ronayne and Caitlin Rose and Russell E. Ryan and Paola Santini and Lise-Marie Seillé and Ekta A. Shah and Lu Shen and Raymond C. Simons and Gregory F. Snyder and Elizabeth R. Stanway and Amber N. Straughn and Harry I. Teplitz and Brittany N. Vanderhoof and Jesús Vega-Ferrero and Weichen Wang and Benjamin J. Weiner and Christopher N. A. Willmer and Stijn Wuyts},
journal= {arXiv preprint arXiv:2208.01816},
year = {2023}
}
备注
Published in The Astrophysical Journal Letters (updated to match the published version)