Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations
Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations
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DOI：
10.3847/2041-8213/acacfe
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发表时间：
2022-08
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通讯作者：
J. Zavala;V. Buat;C. Casey;D. Burgarella;S. Finkelstein;M. Bagley;L. Ciesla;E. Daddi;M. Dickinson;H. Ferguson;Maximilien Franco;E. F. Jim'enez-Andrade;J. Kartaltepe;A. Koekemoer;A. L. Bail;E. Murphy;C. Papovich;S. Tacchella;S. Wilkins;I. Aretxaga;P. Behroozi;J. Champagne;A. Fontana;M. Giavalisco;A. Grazian;N. Grogin;L. Kewley;D. Kocevski;A. Kirkpatrick;J. Lotz;L. Pentericci;P. Pérez-González;N. Pirzkal;S. Ravindranath;R. Somerville;J. Trump;Guang Yang;L. Y. Aaron Yung;O. Almaini;R. Amorín;M. Annunziatella;P. A. Haro;B. Backhaus;G. Barro;E. Bell;R. Bhatawdekar;L. Bisigello;F. Buitrago;A. Calabró;M. Castellano;Ó. Ortiz;Katherine Chworowsky;N. Cleri;S. Cohen;J. Cole;K. Cooke;M. Cooper;A. Cooray;L. Costantin;I. Cox;D. Croton;R. Davé;A. D. L. Vega;A. Dekel;D. Elbaz;V. Estrada-Carpenter;V. Fern'andez;K. Finkelstein;J. Freundlich;S. Fujimoto;'Angela Garc'ia-Argum'anez;J. Gardner;E. Gawiser;C. G'omez-Guijarro;Yuchen Guo;T. Hamilton;N. Hathi;B. Holwerda;M. Hirschmann;M. Huertas-Company;T. Hutchison;K. Iyer;A. Jaskot;S. Jha;S. Jogee;S. Juneau;I. Jung;S. Kassin;P. Kurczynski;R. Larson;G. Leung;A. Long;R. Lucas;B. Magnelli;K. Mantha;J. Matharu;E. McGrath;D. H. Mcintosh;Aubrey Medrano;E. Merlin;B. Mobasher;Alexa M. Morales;J. Newman;D. Nicholls;V. Pandya;M. Rafelski;Kaila Ronayne;Caitlin Rose;R. Ryan;P. Santini;L. Seill'e;E. Shah;Lu Shen;R. Simons;G. Snyder;E. Stanway;A. Straughn;H. Teplitz;B. Vanderhoof;J. Vega-Ferrero;Weichen Wang;B. Weiner;C. Willmer;S. Wuyts
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作者：
J. Zavala;V. Buat;C. Casey;D. Burgarella;S. Finkelstein;M. Bagley;L. Ciesla;E. Daddi;M. Dickinson;H. Ferguson;Maximilien Franco;E. F. Jim'enez-Andrade;J. Kartaltepe;A. Koekemoer;A. L. Bail;E. Murphy;C. Papovich;S. Tacchella;S. Wilkins;I. Aretxaga;P. Behroozi;J. Champagne;A. Fontana;M. Giavalisco;A. Grazian;N. Grogin;L. Kewley;D. Kocevski;A. Kirkpatrick;J. Lotz;L. Pentericci;P. Pérez-González;N. Pirzkal;S. Ravindranath;R. Somerville;J. Trump;Guang Yang;L. Y. Aaron Yung;O. Almaini;R. Amorín;M. Annunziatella;P. A. Haro;B. Backhaus;G. Barro;E. Bell;R. Bhatawdekar;L. Bisigello;F. Buitrago;A. Calabró;M. Castellano;Ó. Ortiz;Katherine Chworowsky;N. Cleri;S. Cohen;J. Cole;K. Cooke;M. Cooper;A. Cooray;L. Costantin;I. Cox;D. Croton;R. Davé;A. D. L. Vega;A. Dekel;D. Elbaz;V. Estrada-Carpenter;V. Fern'andez;K. Finkelstein;J. Freundlich;S. Fujimoto;'Angela Garc'ia-Argum'anez;J. Gardner;E. Gawiser;C. G'omez-Guijarro;Yuchen Guo;T. Hamilton;N. Hathi;B. Holwerda;M. Hirschmann;M. Huertas-Company;T. Hutchison;K. Iyer;A. Jaskot;S. Jha;S. Jogee;S. Juneau;I. Jung;S. Kassin;P. Kurczynski;R. Larson;G. Leung;A. Long;R. Lucas;B. Magnelli;K. Mantha;J. Matharu;E. McGrath;D. H. Mcintosh;Aubrey Medrano;E. Merlin;B. Mobasher;Alexa M. Morales;J. Newman;D. Nicholls;V. Pandya;M. Rafelski;Kaila Ronayne;Caitlin Rose;R. Ryan;P. Santini;L. Seill'e;E. Shah;Lu Shen;R. Simons;G. Snyder;E. Stanway;A. Straughn;H. Teplitz;B. Vanderhoof;J. Vega-Ferrero;Weichen Wang;B. Weiner;C. Willmer;S. Wuyts
在詹姆斯韦伯太空望远镜(JWST)/NIRCam的观测中，z≥10的Lyman-break星系（LBG）候选者正在迅速被发现。由于静止框架紫外光子的中性氢吸收所产生的（红移）断裂，这些源预计会在蓝色滤光片中消失，而在较红的滤光片中被很好地检测到。然而，在这里，我们发现在较低红移（z > 7）的尘埃覆盖的恒星形成星系也可能模仿z bbb10lbg的近红外（近红外）颜色，代表LBG候选样品中的潜在污染物。首先，我们分析了CEERS-DSFG-1，这是一种在F115W和F150W滤波器中未检测到但在更长的波长下检测到的NIRCam dropout。结合JWST数据与（亚）毫米约束，包括深NOEMA干涉观测，我们发现这个源是一个z≈5.1的尘埃恒星形成星系（DSFG）。我们还提出了在850 μm处对最近发现的z≈16 LBG候选者周围的2.6σ SCUBA-2的初步探测，并表明，如果发射是真实的并且与该候选者有关，那么可用的光度测量与z ~ 5尘埃星系一致，尽管它的近红外颜色为蓝色，但具有强烈的星云发射线。进一步的观测是必要的，以减轻这种试探性亚毫米发射的低置信度及其位置的不确定性。我们的分析表明，对NIRCam dropout星系的强大（亚）毫米探测可能意味着z ~ 4-6红移解，其中观测到的近红外断裂可能是强静止框架光学巴尔默断裂结合高尘埃衰减和强星云线发射的结果，而不是静止框架紫外莱曼断裂的结果。这提供了证据，表明dsfg可能会污染JWST观测中对超高红移LBG候选者的搜索。
Lyman-break galaxy (LBG) candidates at z ≳ 10 are rapidly being identified in James Webb Space Telescope (JWST)/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources are expected to drop out in the bluer filters while being well detected in redder filters. However, here we show that dust-enshrouded star-forming galaxies at lower redshifts (z ≲ 7) may also mimic the near-infrared (near-IR) colors of z > 10 LBGs, representing potential contaminants in LBG candidate samples. First, we analyze CEERS-DSFG-1, a NIRCam dropout undetected in the F115W and F150W filters but detected at longer wavelengths. Combining the JWST data with (sub)millimeter constraints, including deep NOEMA interferometric observations, we show that this source is a dusty star-forming galaxy (DSFG) at z ≈ 5.1. We also present a tentative 2.6σ SCUBA-2 detection at 850 μm around a recently identified z ≈ 16 LBG candidate in the same field and show that, if the emission is real and associated with this candidate, the available photometry is consistent with a z ∼ 5 dusty galaxy with strong nebular emission lines despite its blue near-IR colors. Further observations on this candidate are imperative to mitigate the low confidence of this tentative submillimeter emission and its positional uncertainty. Our analysis shows that robust (sub)millimeter detections of NIRCam dropout galaxies likely imply z ∼ 4–6 redshift solutions, where the observed near-IR break would be the result of a strong rest-frame optical Balmer break combined with high dust attenuation and strong nebular line emission, rather than the rest-frame UV Lyman break. This provides evidence that DSFGs may contaminate searches for ultra-high redshift LBG candidates from JWST observations.