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arXiv 2602.17329astro-ph.GA
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MIDIS:深空MIRI红源作为高红移极端巴尔勒断裂和发射线星系候选者的识别

MIDIS: The identification of deep MIRI-red sources as candidates for extreme Balmer-break and line emitting galaxies at high-z

Cosmic Dawn Center (DAWN)(宇宙黎明中心);DTU-Space, Technical University of Denmark(丹麦技术大学空间科学部);Niels Bohr Institute, University of Copenhagen(哥本哈根大学尼尔斯·玻尔研究所);Leiden Observatory, Leiden University(莱顿大学莱顿天文台);Department of Astronomy, Oskar Klein Centre, Stockholm University(斯德哥尔摩大学奥斯卡·克莱因中心天文学系);Department of Astronomy, University of Geneva(日内瓦大学天文学系);Centro de Astrobiología (CAB), CSIC-INTA(CSIC-INTA天体生物学中心);Space Telescope Science Institute(太空望远镜科学研究所)
I. Jermann, G. Brammer, S. Gillman, T. R. Greve, L. A. Boogaard, J. Melinder, R. A. Meyer, P. G. Pérez-González, P. Rinaldi, J. L. Colina, G. Östlin, G. Wright,… 展开作者

I. Jermann, G. Brammer, S. Gillman, T. R. Greve, L. A. Boogaard, J. Melinder, R. A. Meyer, P. G. Pérez-González, P. Rinaldi, J. L. Colina, G. Östlin, G. Wright, J. Álvarez-Márquez, A. Bik, K. I. Caputi, A. Crespo Gómez, L. Costantin, J. Hjorth, E. Iani, S. Kendrew, A. Labiano, D. Langeroodi, F. Peissker, C. Prieto-Jiménez, J. P. Pye, T. V. Tikkanen, F. Walter, P. van der Werf, T. Henning, M. Shuntov

AI总结:

MIDIS研究高红移极端巴尔勒断裂和发射线星系候选者,通过MIRI红源探测揭示高红移星系性质。

摘要:

我们研究了MIRI深空成像调查(MIDIS)中5.6μm MIRI红源的探测和性质,覆盖了哈勃超深场2.4平方角分的区域。MIDIS是迄今为止最深的JWST/MIRI调查,探测到微弱极限并使研究罕见的高红移星系群体成为可能。我们将MIRI红源定义为在MIRI/F560W中以5σ显著性检测到的红颜色源:F444W - F560W ≥ 0.5。使用经验方法,我们估计了MIRI检测的纯度和完整性,并发现5σ检测在28.75 mag时纯度为92%,完整性为54%。我们识别出七个MIRI红源星系候选者,包括一个F115W断续线与高红移星系候选者一致的星系。我们探讨了MIRI红源可能的物理起源,包括活动星系核、尘埃遮蔽星系、极端发射线星系、演化的恒星群体以及小红点(LRDs)。鉴于F444W和F560W滤光片的接近性和MIDIS的深度,MIRI红星系与发射线星系的EW0(Hα) ≥ 750 Å或EW0(Hβ+[OIII]) ≥ 600 Å,或高红移巴尔勒断裂至少为1.6的一致。我们还讨论了一个未在F444W中检测到的极端MIRI红星系,是一个可能的MIRI-only源,我们推导出EW0(Hα) ≈ 6000 Å和EW0(Hβ+[OIII]) ≈ 4000 Å,或高红移LRD类比物,具有巴尔勒断裂为6.3。最后,我们发现MIRI红源检测数量少于从Hα或Hβ+[OIII]线光度函数外推的预期值,与之前的深空搜索一致,而z>10 LRD候选者的缺失与理论预期一致。

英文摘要:

We investigate the detection and nature of 5.6~μm MIRI-red sources in the MIRI Deep Imaging Survey (MIDIS), covering 2.4~arcmin$^2$ in the Hubble Ultra Deep Field. MIDIS is the deepest JWST/MIRI survey to date, probing faint limits and enabling studies of rare high-redshift galaxy populations. We define MIRI-red sources as those detected at 5$σ$ significance in MIRI/F560W with red colors: $m_{\rm F444W} - m_{\rm F560W} \ge 0.5$. Using an empirical methodology, we estimate the purity and completeness of MIRI detections and find that a 5-sigma detection at 28.75 mag has a purity of 92\% and completeness of 54\%. We identify seven MIRI-red galaxy candidates, including an F115W dropout consistent with a high-redshift galaxy candidate. We explore possible physical origins for the MIRI-red population, including active galactic nuclei, dust-obscured galaxies, extreme emission-line galaxies, evolved stellar populations, and Little Red Dots (LRDs). Given the proximity of the F444W and F560W filters and the depth of MIDIS, MIRI-red galaxies are consistent with emission-line galaxies with $EW_0(Hα) \ge 750$ Å or $EW_0(Hβ+ [OIII]) \ge 600$ Å, or high-redshift Balmer breaks of at least 1.6. We also discuss an extreme MIRI-red galaxy undetected in F444W, a potential MIRI-only source, for which we derive $EW_0(Hα) \sim 6000$ Å and $EW_0(Hβ+ [OIII]) \sim 4000$ Å, or high-$z$ LRD analogs with Balmer breaks of 6.3. Finally, we find fewer MIRI-red detections than expected from extrapolations of the H$α$ or H$β$+[OIII] line luminosity functions, consistent with previous deep searches, while the absence of $z>10$ LRD candidates agrees with theoretical expectations for the MIDIS volume.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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