Dusty Starburst伪装成JWST Ceors的超高红移星系

论文标题

Dusty Starburst伪装成JWST Ceors的超高红移星系

Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations

论文作者

Zavala, Jorge A., Buat, Veronique, Casey, Caitlin M., Burgarella, Denis, Finkelstein, Steven L., Bagley, Micaela B., Ciesla, Laure, Daddi, Emanuele, Dickinson, Mark, Ferguson, Henry C., Franco, Maximilien, Jim'enez-Andrade, E. F., Kartaltepe, Jeyhan S., Koekemoer, Anton M., Bail, Aurélien Le, Murphy, E. J., Papovich, Casey, Tacchella, Sandro, Wilkins, Stephen M., Aretxaga, Itziar, Behroozi, Peter, Champagne, Jaclyn B., Fontana, Adriano, Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Kewley, Lisa J., Kocevski, Dale D., Kirkpatrick, Allison, Lotz, Jennifer M., Pentericci, Laura, Perez-Gonzalez, Pablo G., Pirzkal, Nor, Ravindranath, Swara, Somerville, Rachel S., Trump, Jonathan R., Yang, Guang, Yung, L. Y. Aaron, Almaini, Omar, Amorin, Ricardo O., Annunziatella, Marianna, Haro, Pablo Arrabal, Backhaus, Bren E., Barro, Guillermo, Bell, Eric F., Bhatawdekar, Rachana, Bisigello, Laura, Buitrago, Fernando, Calabro, Antonello, Castellano, Marco, Ortiz, Oscar A. Chavez, Chworowsky, Katherine, 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, Dave, Romeel, de la Vega, Alexander, Dekel, Avishai, Elbaz, David, Estrada-Carpenter, Vicente, 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, Huertas-Company, Marc, Hutchison, Taylor A., Iyer, Kartheik G., Jaskot, Anne E., Jha, Saurabh W., Jogee, Shardha, Juneau, Stéphanie, Jung, Intae, Kassin, Susan A., Kurczynski, Peter, Larson, Rebecca L., Leung, Gene C. K., Long, Arianna, Lucas, Ray A., Magnelli, Benjamin, Mantha, Kameswara Bharadwaj, Matharu, Jasleen, McGrath, Elizabeth J., McIntosh, Daniel H., Medrano, Aubrey, Merlin, Emiliano, Mobasher, Bahram, Morales, Alexa M., Newman, Jeffrey A., Nicholls, David C., Pandya, Viraj, Rafelski, Marc, Ronayne, Kaila, Rose, Caitlin, Ryan Jr., Russell E., 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

论文摘要

在JWST/NIRCAM观测值中，在Z> 10处的Lyman Break Galaxy（LBG）候选者正在迅速确定。由于（红移）中性氢紫外线光子的吸收（红移）断裂，预计这些来源将在蓝滤中掉落，同时在红色过滤器中被很好地检测到。但是，我们在这里表明，较低的红移（z <7）处的尘埃笼罩的星形星系也可能模仿Z> 10 lbgs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F115W和F150W过滤器中未发现的NIRCAM辍学，但在更长的波长下检测到。将JWST数据与（子）毫米约束（包括深NOEMA干涉测量值）相结合，我们表明该来源是Z〜5.1处的一个尘土飞扬的星系星系（DSFG）。我们还提出了在同一领域的最近确定的Z〜16 lbg候选者周围850UM处的暂定2.6sigma Scuba-2检测，并表明，如果发射是真实的并且与该候选者相关联，则可用的光度法与Z〜5 Dusty Galaxy保持一致，尽管其蓝色近IR蓝色，但具有强烈的Nebular发射线。对该候选人的进一步观察必须减轻暂定亚毫米排放及其位置不确定性的低信心。我们的分析表明，NIRCAM辍学星系的稳健（子）毫米检测可能意味着Z = 4-6红移解决方案，在该溶液中，观察到的近IR断裂是由于强烈的休息框光学balmer折断与高尘埃衰减和强烈的Nebular Line发射，而不是静止的UV Lyman Break，而不是强烈的灰尘衰减。这提供了证据表明，DSFG可能会污染从JWST观测值中对超高红外LBG候选者的搜索。

Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in 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 2.6sigma SCUBA-2 detection at 850um 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.

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